Potassium-based energy storage devices are attracting increasing attention as an alternative to l... more Potassium-based energy storage devices are attracting increasing attention as an alternative to lithium and sodium systems.
In this study we report on the characterization and use of the anionic metal-organic framework (M... more In this study we report on the characterization and use of the anionic metal-organic framework (MOF) JUMP-1, [(Me2NH2)2[Co3(ntb)2(bdc)]]n, alongside with its alkali-metal ion-exchanged analogs JUMP-1(Li) and JUMP-1(Na), as electrode materials for lithium and sodium batteries. Composite electrodes containing these anionic-MOFs were prepared and tested in 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) in propylene carbonate (PC) and/or 1 M sodium TFSI (NaTFSI) in PC. We showed that the ion-exchanged materials JUMP-1(Li) and JUMP-1(Na) display higher capacities in comparison with the original as-prepared compound JUMP-1 (490 mA∙h∙g−1 vs. 164 mA∙h∙g−1 and 83 mA∙h∙g−1 vs. 73 mA∙h∙g−1 in Li and Na based electrolytes, respectively). Additionally, we showed that the stability of the electrodes containing the ion-exchanged materials is higher than that of JUMP-1, suggesting a form of chemical pre-alkalation works to stabilize them prior to cycling. The results of these studies indica...
The Trypanosoma spp. cause animal and human trypanosomiasis characterized with appreciable health... more The Trypanosoma spp. cause animal and human trypanosomiasis characterized with appreciable health and economic burden mostly in developing nations. There is currently no effective therapy for this parasitic disease, due to poor drug efficacy, drug resistance, and unwanted toxicity, etc. Therefore, new anti-Trypanosoma agents are urgently needed. This study explored new series of imidazoles for anti-Trypanosoma properties in vitro and in vivo. The imidazoles showed moderate to strong and specific action against growth of T. congolense. For example, the efficacy of the imidazole compounds to restrict Trypanosoma growth in vitro was ≥ 12-fold specific towards T. congolense relative to the mammalian cells. Additionally, the in vivo study revealed that the imidazoles exhibited promising anti-Trypanosoma efficacy corroborating the in vitro anti-parasite capacity. In particular, three imidazole compounds (C1, C6, and C8) not only cleared the systemic parasite burden but cured infected rats...
Zeitschrift Fur Naturforschung Section B-a Journal of Chemical Sciences, 1997
The compound Na-7[Na subset of{((Mo2O4)-O-V)(3)(mu 2-OH)(3)H(PhPO3)4}(2)] . 2 N2H4 . 26 H2O (form... more The compound Na-7[Na subset of{((Mo2O4)-O-V)(3)(mu 2-OH)(3)H(PhPO3)4}(2)] . 2 N2H4 . 26 H2O (formulation with respect to the aggregate in the crystal) has been synthesized and characterized by single-crystal X-ray structure analysis (which alone does not allow the determination of the formula), UV/Vis/NIR/IR, P-31{H-1}, H-1 and Na-23 NMR spectroscopy as well as magnetic susceptibility measurements. The compound is formed under similar conditions as (NH2Me2)(6)[H-2 subset of ((MO2O4)-O-V)(6)O-4(mu(2)-OH)(12)((MOO3)-O-VI)(4)]. Correspondingly, both cluster frameworks are built up by the same {((Mo2O4)-O-V)3(mu(2)-OH)(3)}(3+) units.
A series of six new, bidentate ligands based on N-(2-(R-sulfonamido)benzyl)R-sulfonamide have bee... more A series of six new, bidentate ligands based on N-(2-(R-sulfonamido)benzyl)R-sulfonamide have been isolated as dianionic or monoanionic chelators via condensation of 2-(aminomethyl)aniline with sulfonyl chloride reagents; R = methyl (1 and 1′), tolyl (2 and 2′), 2,4,6-trimethylphenyl (3), or 2,4,6-triisopropylphenyl (4). Complexes of ligands 2–4 reacted at room temperature with palladium(ii) acetate in the presence of various monodentate N-donor co-ligands to form complexes Pd2(2dmap), Pd2′(OAc.py), Pd3(2acn), Pd3(2py), Pd4(2acn), and Pd4(2py), which were structurally confirmed by three X-ray crystal analyses. Results of catalysis studies in water showed high turnover frequencies and yields of up to 98 % within 10 min and at 0.2 mol-% palladium catalyst loading. Relative to ligand-free catalysis in the presence of only Pd(OAc)2, the ligand-supported palladium species clearly possess positive catalytic advantage. Furthermore, Suzuki coupling efficiencies by 1 : 1 ‘Pd(OAc)2 + ligand’ ...
A cobalt(II)‐based spin triangle shows a significant spin–electric coupling. [Co3(pytag)(py)6Cl3]... more A cobalt(II)‐based spin triangle shows a significant spin–electric coupling. [Co3(pytag)(py)6Cl3]ClO4⋅3 py crystallizes in the acentric monoclinic space group P21. The intra‐triangle antiferromagnetic interaction, of the order of ca. −15 cm−1 (H=−JSaSb), leads to spin frustration. The two expected energy‐degenerate ground doublets are, however, separated by a few wavenumbers, as a consequence of magnetic anisotropy and deviations from threefold symmetry. The Co3 planes of symmetry‐related molecules are almost parallel, allowing for the determination of the spin–electric properties of single crystals by EFM‐ESR spectroscopy. The spin–electric effect detected when the electric field is applied in the Co3 plane was revealed by a shift in the resonance field. It was quantified as ΔgE/E=0.11×10−9 m V−1, which in terms of frequency corresponds to approximately 0.3 Hz m V−1. This value is comparable to what was determined for a Cu3 triangle despite the antiferromagnetic interaction being 2...
In transition-metal-mediated catalysis, design of new, well defined coordination architectures an... more In transition-metal-mediated catalysis, design of new, well defined coordination architectures and subjecting them to catalysis testing under the same reaction conditions is a necessity tool for improved understanding of desirable active site geometries and characteristics.
Commercial transesterification of vegetable oil to biodiesel using alkaline hydroxides requires e... more Commercial transesterification of vegetable oil to biodiesel using alkaline hydroxides requires expensive refined vegetable oil and anhydrous alcohols to avoid saponification. These issues are not present in the acid-catalyzed process; however, the challenge still lies in developing stable and active solid acid catalysts. Herein, Amberlyst 45, a resin for high-temperature application, was efficiently used for biodiesel production by the methanolysis or ethanolysis of vegetable oil. Yields of up to 80 and 84% were obtained for the fatty acid methyl ester and the fatty acid ethyl ester, respectively. Two processes are proposed and showed to be efficient: (i) incremental addition of alcohol along with the reaction for both methanolysis and ethanolysis; or (ii) one-pot reaction for ethanolysis using oil/ethanol molar ratio of 1/18. The catalytic system used also showed to be compatible with used oil (2.48 ± 0.03 mg NaOH g oil −1) and to the presence of water (10-20 wt. % based on the alcohol), allowing the use of waste oil and hydrated alcohol.
Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H 2 B(pz... more Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H 2 B(pz)(pypz)} 2 ] (pz = pyrazole, pypz = pyridylpyrazole; 1) were prepared and investigated by differential scanning calorimetry (DSC), magnetic measurements, Moßbauer, vibrational, and absorption spectroscopy as well as single-crystal and X-ray powder diffraction. DSC measurements reveal that upon heating the thermodynamically metastable form 1-II to ∼178°C it transforms into 1-I in an exothermic reaction, which proves that these modifications are related by monotropism. Both forms show thermal SCO with T 1/2 values of 390 K (1-II) and 270 K (1-I). An analysis of the crystal structures of 1-II and the corresponding Zn(II) (2) and Co(II) (3) complexes that are isotypic with 1-I reveals that form II consists of dimers coupled by strong intramolecular π•••π interactions, which is not the case for 1-I. In agreement with these findings, investigations of thin films of 1, where significant π•••π interactions should be absent, reveal SCO behavior similar to that of 1-I. These results underscore the importance of cooperativity for the spin-transition behavior of this class of complexes.
Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis... more Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis and access to unsymmetric dinuclear complexes.
Genome mining and chemical analyses revealed that rhizosphere bacteria (Paraburkholderia graminis... more Genome mining and chemical analyses revealed that rhizosphere bacteria (Paraburkholderia graminis) produce a new type of siderophore, gramibactin, a lipodepsipeptide that efficiently binds iron with a logβ value of 27.6. Complexation-induced proton NMR chemical shifts show that the unusual N-nitrosohydroxylamine (diazeniumdiolate) moieties participate in metal binding. Gramibactin biosynthesis genes are conserved in numerous plant-associated bacteria associated with rice, wheat, and maize, which may utilize iron from the complex.
The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)tr... more The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods.
Langmuir : the ACS journal of surfaces and colloids, Jan 10, 2016
Carbon/polypyrrole (PPy) composites are promising electrode materials for energy storage applicat... more Carbon/polypyrrole (PPy) composites are promising electrode materials for energy storage applications such as lightweight capacitors. Although these materials are composed of relatively inexpensive components, there is a gap of knowledge regarding the correlation between surface, porosity, ion exchange dynamics, and the interplay of the double layer capacitance and pseudocapacitance. In this work we evaluate the specific surface area analyzed by the BET method and the area accessible for ions using electrochemical quartz-crystal microbalance (EQCM) for SWCNT/PPy and carbon black Vulcan XC72-R/PPy composites. The study revealed that the polymer has significant influence on the pore size of the composites. Although the BET surface is low for the polypyrrole, the electrode mass change and thus the electrochemical area are large for the polymer-containing electrodes. This indicates that multiple redox active centers in the charged polymer chain are good ion scavengers. Also, for the com...
The effects of aluminum alkoxide single source precursors on the sol–gel synthesis of highly ther... more The effects of aluminum alkoxide single source precursors on the sol–gel synthesis of highly thermally stable nanostructured alumina by nonionic triblock copolymer P123 were investigated.
The synthesis and spectroscopic characterization of dioxidovanadium(V) complexes with hydrazone S... more The synthesis and spectroscopic characterization of dioxidovanadium(V) complexes with hydrazone Schiff-base ligands derived from salicylaldehyde and x-hydroxy functionalized carbonic acid hydrazides with three different chain lengths are reported. This includes three series, the ammonium and potassium salts of the complex anions with the twofold deprotonated ligand systems as well as the corresponding neutral complexes [VO 2 (HL)]. For four complexes within these series crystal structures are reported, namely the full series of complexes with the ligand system containing the shortest chain length (i.e. ammonium salt, potassium salt, and neutral complex) and the ammonium salt with the ligand based on the longest side chain. All complexes posses a dioxidovanadium group with a five-coordinated vanadium atom in a distorted square pyramidal geometry. Within the series of ammonium salts an extensive hydrogen-bonding network including the side chain hydroxyl end group is observed which is virtually independent of the side chain length. Whereas the structure of the potassium salt is governed by ionic contacts resulting in a bilayered packing arrangement with intercalated potassium ions. In the case of the neutral complex a two-dimensional hydrogen-bonding network is observed. Magic angle spinning solid-state 51 V NMR is used to characterize all three series of complexes. The variation of the chemical shift anisotropy parameters is found to be strongly dependent on differences in the supramolecular structure of the compounds, such as hydrogen bonding or crystal packing, which are caused by variation of the protonation state, counterion, and side chain length.
A cis-dioxomolybdenum (VI) complex with an amino acid functionalized hydrazone ligand derived fro... more A cis-dioxomolybdenum (VI) complex with an amino acid functionalized hydrazone ligand derived from salicylaldehyde and Boc-protected β-alanine hydrazide (Boc= t-butyloxycarbonyl) has been synthesized. The X-ray crystal structure reveals a distorted ...
Abstract The reaction between the tris(2-hydroxybenzylidene)triaminoguanidin hydrochloride (H6L)C... more Abstract The reaction between the tris(2-hydroxybenzylidene)triaminoguanidin hydrochloride (H6L)Cl and copper(II) chloride in the presence of triethylamine leads to a three-dimensional coordination polymer with two interpenetrating (10,3)-a networks of opposite chirality. Magnetic studies revealed strong antiferromagnetic coupling between copper ions of the spin frustrated trinuclear building unit.
Potassium-based energy storage devices are attracting increasing attention as an alternative to l... more Potassium-based energy storage devices are attracting increasing attention as an alternative to lithium and sodium systems.
In this study we report on the characterization and use of the anionic metal-organic framework (M... more In this study we report on the characterization and use of the anionic metal-organic framework (MOF) JUMP-1, [(Me2NH2)2[Co3(ntb)2(bdc)]]n, alongside with its alkali-metal ion-exchanged analogs JUMP-1(Li) and JUMP-1(Na), as electrode materials for lithium and sodium batteries. Composite electrodes containing these anionic-MOFs were prepared and tested in 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) in propylene carbonate (PC) and/or 1 M sodium TFSI (NaTFSI) in PC. We showed that the ion-exchanged materials JUMP-1(Li) and JUMP-1(Na) display higher capacities in comparison with the original as-prepared compound JUMP-1 (490 mA∙h∙g−1 vs. 164 mA∙h∙g−1 and 83 mA∙h∙g−1 vs. 73 mA∙h∙g−1 in Li and Na based electrolytes, respectively). Additionally, we showed that the stability of the electrodes containing the ion-exchanged materials is higher than that of JUMP-1, suggesting a form of chemical pre-alkalation works to stabilize them prior to cycling. The results of these studies indica...
The Trypanosoma spp. cause animal and human trypanosomiasis characterized with appreciable health... more The Trypanosoma spp. cause animal and human trypanosomiasis characterized with appreciable health and economic burden mostly in developing nations. There is currently no effective therapy for this parasitic disease, due to poor drug efficacy, drug resistance, and unwanted toxicity, etc. Therefore, new anti-Trypanosoma agents are urgently needed. This study explored new series of imidazoles for anti-Trypanosoma properties in vitro and in vivo. The imidazoles showed moderate to strong and specific action against growth of T. congolense. For example, the efficacy of the imidazole compounds to restrict Trypanosoma growth in vitro was ≥ 12-fold specific towards T. congolense relative to the mammalian cells. Additionally, the in vivo study revealed that the imidazoles exhibited promising anti-Trypanosoma efficacy corroborating the in vitro anti-parasite capacity. In particular, three imidazole compounds (C1, C6, and C8) not only cleared the systemic parasite burden but cured infected rats...
Zeitschrift Fur Naturforschung Section B-a Journal of Chemical Sciences, 1997
The compound Na-7[Na subset of{((Mo2O4)-O-V)(3)(mu 2-OH)(3)H(PhPO3)4}(2)] . 2 N2H4 . 26 H2O (form... more The compound Na-7[Na subset of{((Mo2O4)-O-V)(3)(mu 2-OH)(3)H(PhPO3)4}(2)] . 2 N2H4 . 26 H2O (formulation with respect to the aggregate in the crystal) has been synthesized and characterized by single-crystal X-ray structure analysis (which alone does not allow the determination of the formula), UV/Vis/NIR/IR, P-31{H-1}, H-1 and Na-23 NMR spectroscopy as well as magnetic susceptibility measurements. The compound is formed under similar conditions as (NH2Me2)(6)[H-2 subset of ((MO2O4)-O-V)(6)O-4(mu(2)-OH)(12)((MOO3)-O-VI)(4)]. Correspondingly, both cluster frameworks are built up by the same {((Mo2O4)-O-V)3(mu(2)-OH)(3)}(3+) units.
A series of six new, bidentate ligands based on N-(2-(R-sulfonamido)benzyl)R-sulfonamide have bee... more A series of six new, bidentate ligands based on N-(2-(R-sulfonamido)benzyl)R-sulfonamide have been isolated as dianionic or monoanionic chelators via condensation of 2-(aminomethyl)aniline with sulfonyl chloride reagents; R = methyl (1 and 1′), tolyl (2 and 2′), 2,4,6-trimethylphenyl (3), or 2,4,6-triisopropylphenyl (4). Complexes of ligands 2–4 reacted at room temperature with palladium(ii) acetate in the presence of various monodentate N-donor co-ligands to form complexes Pd2(2dmap), Pd2′(OAc.py), Pd3(2acn), Pd3(2py), Pd4(2acn), and Pd4(2py), which were structurally confirmed by three X-ray crystal analyses. Results of catalysis studies in water showed high turnover frequencies and yields of up to 98 % within 10 min and at 0.2 mol-% palladium catalyst loading. Relative to ligand-free catalysis in the presence of only Pd(OAc)2, the ligand-supported palladium species clearly possess positive catalytic advantage. Furthermore, Suzuki coupling efficiencies by 1 : 1 ‘Pd(OAc)2 + ligand’ ...
A cobalt(II)‐based spin triangle shows a significant spin–electric coupling. [Co3(pytag)(py)6Cl3]... more A cobalt(II)‐based spin triangle shows a significant spin–electric coupling. [Co3(pytag)(py)6Cl3]ClO4⋅3 py crystallizes in the acentric monoclinic space group P21. The intra‐triangle antiferromagnetic interaction, of the order of ca. −15 cm−1 (H=−JSaSb), leads to spin frustration. The two expected energy‐degenerate ground doublets are, however, separated by a few wavenumbers, as a consequence of magnetic anisotropy and deviations from threefold symmetry. The Co3 planes of symmetry‐related molecules are almost parallel, allowing for the determination of the spin–electric properties of single crystals by EFM‐ESR spectroscopy. The spin–electric effect detected when the electric field is applied in the Co3 plane was revealed by a shift in the resonance field. It was quantified as ΔgE/E=0.11×10−9 m V−1, which in terms of frequency corresponds to approximately 0.3 Hz m V−1. This value is comparable to what was determined for a Cu3 triangle despite the antiferromagnetic interaction being 2...
In transition-metal-mediated catalysis, design of new, well defined coordination architectures an... more In transition-metal-mediated catalysis, design of new, well defined coordination architectures and subjecting them to catalysis testing under the same reaction conditions is a necessity tool for improved understanding of desirable active site geometries and characteristics.
Commercial transesterification of vegetable oil to biodiesel using alkaline hydroxides requires e... more Commercial transesterification of vegetable oil to biodiesel using alkaline hydroxides requires expensive refined vegetable oil and anhydrous alcohols to avoid saponification. These issues are not present in the acid-catalyzed process; however, the challenge still lies in developing stable and active solid acid catalysts. Herein, Amberlyst 45, a resin for high-temperature application, was efficiently used for biodiesel production by the methanolysis or ethanolysis of vegetable oil. Yields of up to 80 and 84% were obtained for the fatty acid methyl ester and the fatty acid ethyl ester, respectively. Two processes are proposed and showed to be efficient: (i) incremental addition of alcohol along with the reaction for both methanolysis and ethanolysis; or (ii) one-pot reaction for ethanolysis using oil/ethanol molar ratio of 1/18. The catalytic system used also showed to be compatible with used oil (2.48 ± 0.03 mg NaOH g oil −1) and to the presence of water (10-20 wt. % based on the alcohol), allowing the use of waste oil and hydrated alcohol.
Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H 2 B(pz... more Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H 2 B(pz)(pypz)} 2 ] (pz = pyrazole, pypz = pyridylpyrazole; 1) were prepared and investigated by differential scanning calorimetry (DSC), magnetic measurements, Moßbauer, vibrational, and absorption spectroscopy as well as single-crystal and X-ray powder diffraction. DSC measurements reveal that upon heating the thermodynamically metastable form 1-II to ∼178°C it transforms into 1-I in an exothermic reaction, which proves that these modifications are related by monotropism. Both forms show thermal SCO with T 1/2 values of 390 K (1-II) and 270 K (1-I). An analysis of the crystal structures of 1-II and the corresponding Zn(II) (2) and Co(II) (3) complexes that are isotypic with 1-I reveals that form II consists of dimers coupled by strong intramolecular π•••π interactions, which is not the case for 1-I. In agreement with these findings, investigations of thin films of 1, where significant π•••π interactions should be absent, reveal SCO behavior similar to that of 1-I. These results underscore the importance of cooperativity for the spin-transition behavior of this class of complexes.
Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis... more Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis and access to unsymmetric dinuclear complexes.
Genome mining and chemical analyses revealed that rhizosphere bacteria (Paraburkholderia graminis... more Genome mining and chemical analyses revealed that rhizosphere bacteria (Paraburkholderia graminis) produce a new type of siderophore, gramibactin, a lipodepsipeptide that efficiently binds iron with a logβ value of 27.6. Complexation-induced proton NMR chemical shifts show that the unusual N-nitrosohydroxylamine (diazeniumdiolate) moieties participate in metal binding. Gramibactin biosynthesis genes are conserved in numerous plant-associated bacteria associated with rice, wheat, and maize, which may utilize iron from the complex.
The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)tr... more The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods.
Langmuir : the ACS journal of surfaces and colloids, Jan 10, 2016
Carbon/polypyrrole (PPy) composites are promising electrode materials for energy storage applicat... more Carbon/polypyrrole (PPy) composites are promising electrode materials for energy storage applications such as lightweight capacitors. Although these materials are composed of relatively inexpensive components, there is a gap of knowledge regarding the correlation between surface, porosity, ion exchange dynamics, and the interplay of the double layer capacitance and pseudocapacitance. In this work we evaluate the specific surface area analyzed by the BET method and the area accessible for ions using electrochemical quartz-crystal microbalance (EQCM) for SWCNT/PPy and carbon black Vulcan XC72-R/PPy composites. The study revealed that the polymer has significant influence on the pore size of the composites. Although the BET surface is low for the polypyrrole, the electrode mass change and thus the electrochemical area are large for the polymer-containing electrodes. This indicates that multiple redox active centers in the charged polymer chain are good ion scavengers. Also, for the com...
The effects of aluminum alkoxide single source precursors on the sol–gel synthesis of highly ther... more The effects of aluminum alkoxide single source precursors on the sol–gel synthesis of highly thermally stable nanostructured alumina by nonionic triblock copolymer P123 were investigated.
The synthesis and spectroscopic characterization of dioxidovanadium(V) complexes with hydrazone S... more The synthesis and spectroscopic characterization of dioxidovanadium(V) complexes with hydrazone Schiff-base ligands derived from salicylaldehyde and x-hydroxy functionalized carbonic acid hydrazides with three different chain lengths are reported. This includes three series, the ammonium and potassium salts of the complex anions with the twofold deprotonated ligand systems as well as the corresponding neutral complexes [VO 2 (HL)]. For four complexes within these series crystal structures are reported, namely the full series of complexes with the ligand system containing the shortest chain length (i.e. ammonium salt, potassium salt, and neutral complex) and the ammonium salt with the ligand based on the longest side chain. All complexes posses a dioxidovanadium group with a five-coordinated vanadium atom in a distorted square pyramidal geometry. Within the series of ammonium salts an extensive hydrogen-bonding network including the side chain hydroxyl end group is observed which is virtually independent of the side chain length. Whereas the structure of the potassium salt is governed by ionic contacts resulting in a bilayered packing arrangement with intercalated potassium ions. In the case of the neutral complex a two-dimensional hydrogen-bonding network is observed. Magic angle spinning solid-state 51 V NMR is used to characterize all three series of complexes. The variation of the chemical shift anisotropy parameters is found to be strongly dependent on differences in the supramolecular structure of the compounds, such as hydrogen bonding or crystal packing, which are caused by variation of the protonation state, counterion, and side chain length.
A cis-dioxomolybdenum (VI) complex with an amino acid functionalized hydrazone ligand derived fro... more A cis-dioxomolybdenum (VI) complex with an amino acid functionalized hydrazone ligand derived from salicylaldehyde and Boc-protected β-alanine hydrazide (Boc= t-butyloxycarbonyl) has been synthesized. The X-ray crystal structure reveals a distorted ...
Abstract The reaction between the tris(2-hydroxybenzylidene)triaminoguanidin hydrochloride (H6L)C... more Abstract The reaction between the tris(2-hydroxybenzylidene)triaminoguanidin hydrochloride (H6L)Cl and copper(II) chloride in the presence of triethylamine leads to a three-dimensional coordination polymer with two interpenetrating (10,3)-a networks of opposite chirality. Magnetic studies revealed strong antiferromagnetic coupling between copper ions of the spin frustrated trinuclear building unit.
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Papers by Winfried Plass