An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Lithium manganese phosphate (LiMnPO4) and a series of chromium‐doped lithium manganese phosphate ... more Lithium manganese phosphate (LiMnPO4) and a series of chromium‐doped lithium manganese phosphate with variation in Cr content LiCrxMn1−xPO4 (x = 0.03, 0.06, 0.1) were prepared via conventional sol‐gel method and their dielectric properties have been explored as a function of frequency. The structure and morphology were investigated by X‐ray diffraction technique (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The influence of frequency upon electrical conductivity as well as di‐electric properties of the as‐synthesized LiCrxMn1−xPO4 materials have been analyzed by dielectric parameters and AC conductivity using impedance analyzer. It was observed that dielectric constant increased with frequency at lower chromium concentration while at higher chromium contents, the dielectric constant was decreased with increasing frequency. Hence, the composition with highest Cr content (ie, x = 0.1) is proved as best material for various applications owing to its lowest AC‐conductivity and lowest dielectric loss. Therefore, it is revealed that chromium doping is quite advantageous for performance of LiMnPO4 in device applications as Cr doped LiMnPO4 unveiled improved dielectric loss.
Journal of Materials Science & Technology, 2021
Abstract Metal phthalocyanine is considered one of the most promising candidates for the design a... more Abstract Metal phthalocyanine is considered one of the most promising candidates for the design and fabrication of flexible resistive random access memory (RRAM) devices due to its intrinsic flexibility and excellent functionality. However, performance degradation and the lack of multi-level capability, which can directly expand the storage capacity in one memory cell without sacrificing additional layout area, are the primary obstacles to the use of metal phthalocyanine RRAMs in information storage. Here, a flexible RRAM with pristine nickel phthalocyanine (NiPc) as the resistive layer is reported for multi-level data storage. Due to its high trap-concentration, the charge transport behavior of the device agrees well with classical space charge limited conduction controlled by traps, leading to an excellent performance, including a high on-off current ratio of 107, a long-term retention of 106 s, a reproducible endurance over 6000 cycles, long-term flexibility at a bending strain of 0.6%, a write speed of 50 ns under sequential bias pulses and the capability of multi-level data storage with reliable retention and uniformity.
The reaction of the di(alkyn-1-yl)silanes Me2Si(C≡CSiMe2H)2 1a and Me(H)Si(C≡CSiMe2H)2 1b with tr... more The reaction of the di(alkyn-1-yl)silanes Me2Si(C≡CSiMe2H)2 1a and Me(H)Si(C≡CSiMe2H)2 1b with triethylborane was studied. In the case of 1a, the 4-ethyl-3-diethylboryl-1,1-dimethyl-2,5- bis(dimethylsilyl)-1-sila-2,4-cyclop entadiene 2a was the sole product. In the case of 1b, the analogous silole 2b was formed along with two other products which were identified as di(alkenyl)silanes 3b and 4b, in which different types of electron-deficient Si-H-B bridges could be detected. All products were characterised by consistent sets of solution NMR data (1H, 11B, 13C and 29Si NMR). The coupling constants 1J(13C,13C) were measured for 2a and calculated by using DFT methods (B3LYP/6-311+G(d,p) level of theory)
A series of palladium (II) complexes (1-8) with N-(acyl)-N 0 ,N 0-(disubstituted) thioureas and p... more A series of palladium (II) complexes (1-8) with N-(acyl)-N 0 ,N 0-(disubstituted) thioureas and phosphine ligands were synthesized and characterized by FT-IR, multinuclear (1 H, 13 C & 31 P) NMR spectroscopy and elemental analysis. The crystal structures of the Pd(II) complexes (1) & (5) of the type Pd II (L-O,S) (Ĺ-P)Cl were determined by single crystal X-ray diffraction analysis. They adopted the square planar geometry, where the N-(acyl)-N 0 , N 0-(disubstituted) thioureas showed bidentate coordination mode in a chelating fashion through O and S donor atoms, and phosphine ligands through P atom at palladium centre. In vitro cytotoxic profile of the synthesized palladium(II) complexes (1-8) was determined against lung squamous carcinoma and breast adenocarcinoma cell lines. These complexes were also tested for promastigote forms of Leishmania tropica to evaluate their antileishmanial activity. The complexes bearing 2,4-dichlorophenyl moiety among the screened complexes were the most active with IC 50 values 1.72 ± 0.27, 2.12 ± 0.44, 1.57 ± 0.16 mM against the targets MDA-MB-231, H-157, Leishmania tropica, respectively.
Environmental monitoring and assessment, Jan 4, 2018
The impact of city effluents on water quality of Indus River was assessed in the southern region ... more The impact of city effluents on water quality of Indus River was assessed in the southern region of Khyber Pakhtunkhwa, Pakistan. Water samples were collected in dry (DS) and wet (WS) seasons from seven sampling zones along Indus River and the physical, bacteriological, and chemical parameters determining water quality were quantified. There were marked temporal and spatial variations in the water quality of Indus River. The magnitude of pollution was high in WS compared with DS. The quality of water varied across the sampling zones, and it greatly depended upon the nature of effluents entering the river. Water samples exceeded the WHO permissible limits for pH, EC, TDS, TS, TSS, TH, DO, BOD, COD, total coliforms, Escherichia coli, Ca, Mg, NO, and PO. Piper analysis indicated that water across the seven sampling zones along Indus River was alkaline in nature. Correlation analyses indicated that EC, TDS, TS, TH, DO, BOD, and COD may be considered as key physical parameters, while Na,...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
h i g h l i g h t s New ferrocenyl phenylguanidines. Preliminary investigation of anticancer pote... more h i g h l i g h t s New ferrocenyl phenylguanidines. Preliminary investigation of anticancer potency. DNA binding studies by UV and CV. High binding constant values (K b = 10 5). Good free radical scavengers. g r a p h i c a l a b s t r a c t The DNA binding potency of the synthesized guanidines (1-6) were determined by UV-Vis spectrophotometer and cyclic voltammeter by keeping the concentration of the compounds constant (A) while varying the amount of DNA (B-H). All the compounds showed electrostatic mode of interaction with DNA having impressively high binding constants values (9.9 Â 10 4-1.3 Â 10 5 (M À1)). The compounds also showed good antioxidant activities. These two parameters are helpful to design new anticancer drugs.
... 1,1-Organoboration, using triethyl-, triallyl-and triphenyl-borane (BEt3, BAll3, BPh3), of di... more ... 1,1-Organoboration, using triethyl-, triallyl-and triphenyl-borane (BEt3, BAll3, BPh3), of dimethysilylethynyl(trimethyl)stannane, Me3SnCCSi(H)Me2 (1), affords alkenes bearing three different organometallic groups at the CC bond. ... bond and ...
To quantify the impact of horse purslane (Trianthema portulacastrum) on the yield and yield compo... more To quantify the impact of horse purslane (Trianthema portulacastrum) on the yield and yield components of maize, experiments were conducted at Agricultural Research Farm, NWFP Agricultural University Peshawar, Pakistan for two crop seasons viz., 2006 and 2007, using open pollinated variety 'Azam'. The experiments were laid out in Randomized Complete Block (RCB) design with split plot arrangements having three replications. Four maize plant spacings (15, 20, 25 and 30 cm) were kept in main plots, while weed densities (3, 6, 9, 12, 15 and 18 m-2) were allotted to sub plots. Narrow plant spacing of 15 cm produced higher grain yield of 2.85 and 2.66 t ha-1 as compared to 2.30 and 2.08 t ha-1 in wider plant spacing of 30 cm during 2006 and 2007, respectively. However, during both years, yield components of individual plants were negatively affected with a decrease in plant spacing. Similarly, control plots produced higher grain yield of 3.04 and 2.87 t ha-1 as compared to grain yield of 2.14 and 2.0 t ha-1 in plots having weed density of 18 plants m-2 in 2006 and 2007, respectively. Losses due to T.
Acta Crystallographica Section E Structure Reports Online, 2006
Acta Cryst. (2006). E62, m1192-m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] m1193 metal-organ... more Acta Cryst. (2006). E62, m1192-m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] m1193 metal-organic papers m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] Acta Cryst. (2006). E62, m1192-m1194 supporting information sup-1
Acta Crystallographica Section E Structure Reports Online, 2006
The molecular structure of the title compound, tetra-μ2-(cyclopent-2-enyl)acetato-1:2κ2 O:O′;1:3κ... more The molecular structure of the title compound, tetra-μ2-(cyclopent-2-enyl)acetato-1:2κ2 O:O′;1:3κ2 O:O′;2:4κ2 O:O′;3:4κ2 O:O′-octaethyl-1κ2 C,2κ2 C,3κ2 C,4κ2 C-di-μ3-oxo-1:2:3κ3 O;2:3:4κ3 O-tetratin, [Sn4(C2H5)8(C7H9O2)4O2], is composed of two independent centrosymmetric dimers lying about inversion centers. In each dimer, the central Sn2O2 core is fused with two four-membered (Sn2O2) and two six-membered (Sn2O3C) rings. The endocyclic Sn atoms are six-coordinate in a skew-trapezoidal bipyramidal environment. The exocyclic Sn atoms are five-coordinate and show disotorted trigonal–bipyramidal geometry. The cyclopentenylacetate ligand shows different modes of coordination with tin. In both dimers, the Sn—C distances lie in a very narrow range [2.118 (4)–2.134 (4) Å], while the Sn—O distances range between 2.042 (2) and 2.314 (3) Å for strong bonds and between 2.638 (3) and 2.658 (3) Å for relatively weaker Sn—O bonds.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Lithium manganese phosphate (LiMnPO4) and a series of chromium‐doped lithium manganese phosphate ... more Lithium manganese phosphate (LiMnPO4) and a series of chromium‐doped lithium manganese phosphate with variation in Cr content LiCrxMn1−xPO4 (x = 0.03, 0.06, 0.1) were prepared via conventional sol‐gel method and their dielectric properties have been explored as a function of frequency. The structure and morphology were investigated by X‐ray diffraction technique (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The influence of frequency upon electrical conductivity as well as di‐electric properties of the as‐synthesized LiCrxMn1−xPO4 materials have been analyzed by dielectric parameters and AC conductivity using impedance analyzer. It was observed that dielectric constant increased with frequency at lower chromium concentration while at higher chromium contents, the dielectric constant was decreased with increasing frequency. Hence, the composition with highest Cr content (ie, x = 0.1) is proved as best material for various applications owing to its lowest AC‐conductivity and lowest dielectric loss. Therefore, it is revealed that chromium doping is quite advantageous for performance of LiMnPO4 in device applications as Cr doped LiMnPO4 unveiled improved dielectric loss.
Journal of Materials Science & Technology, 2021
Abstract Metal phthalocyanine is considered one of the most promising candidates for the design a... more Abstract Metal phthalocyanine is considered one of the most promising candidates for the design and fabrication of flexible resistive random access memory (RRAM) devices due to its intrinsic flexibility and excellent functionality. However, performance degradation and the lack of multi-level capability, which can directly expand the storage capacity in one memory cell without sacrificing additional layout area, are the primary obstacles to the use of metal phthalocyanine RRAMs in information storage. Here, a flexible RRAM with pristine nickel phthalocyanine (NiPc) as the resistive layer is reported for multi-level data storage. Due to its high trap-concentration, the charge transport behavior of the device agrees well with classical space charge limited conduction controlled by traps, leading to an excellent performance, including a high on-off current ratio of 107, a long-term retention of 106 s, a reproducible endurance over 6000 cycles, long-term flexibility at a bending strain of 0.6%, a write speed of 50 ns under sequential bias pulses and the capability of multi-level data storage with reliable retention and uniformity.
The reaction of the di(alkyn-1-yl)silanes Me2Si(C≡CSiMe2H)2 1a and Me(H)Si(C≡CSiMe2H)2 1b with tr... more The reaction of the di(alkyn-1-yl)silanes Me2Si(C≡CSiMe2H)2 1a and Me(H)Si(C≡CSiMe2H)2 1b with triethylborane was studied. In the case of 1a, the 4-ethyl-3-diethylboryl-1,1-dimethyl-2,5- bis(dimethylsilyl)-1-sila-2,4-cyclop entadiene 2a was the sole product. In the case of 1b, the analogous silole 2b was formed along with two other products which were identified as di(alkenyl)silanes 3b and 4b, in which different types of electron-deficient Si-H-B bridges could be detected. All products were characterised by consistent sets of solution NMR data (1H, 11B, 13C and 29Si NMR). The coupling constants 1J(13C,13C) were measured for 2a and calculated by using DFT methods (B3LYP/6-311+G(d,p) level of theory)
A series of palladium (II) complexes (1-8) with N-(acyl)-N 0 ,N 0-(disubstituted) thioureas and p... more A series of palladium (II) complexes (1-8) with N-(acyl)-N 0 ,N 0-(disubstituted) thioureas and phosphine ligands were synthesized and characterized by FT-IR, multinuclear (1 H, 13 C & 31 P) NMR spectroscopy and elemental analysis. The crystal structures of the Pd(II) complexes (1) & (5) of the type Pd II (L-O,S) (Ĺ-P)Cl were determined by single crystal X-ray diffraction analysis. They adopted the square planar geometry, where the N-(acyl)-N 0 , N 0-(disubstituted) thioureas showed bidentate coordination mode in a chelating fashion through O and S donor atoms, and phosphine ligands through P atom at palladium centre. In vitro cytotoxic profile of the synthesized palladium(II) complexes (1-8) was determined against lung squamous carcinoma and breast adenocarcinoma cell lines. These complexes were also tested for promastigote forms of Leishmania tropica to evaluate their antileishmanial activity. The complexes bearing 2,4-dichlorophenyl moiety among the screened complexes were the most active with IC 50 values 1.72 ± 0.27, 2.12 ± 0.44, 1.57 ± 0.16 mM against the targets MDA-MB-231, H-157, Leishmania tropica, respectively.
Environmental monitoring and assessment, Jan 4, 2018
The impact of city effluents on water quality of Indus River was assessed in the southern region ... more The impact of city effluents on water quality of Indus River was assessed in the southern region of Khyber Pakhtunkhwa, Pakistan. Water samples were collected in dry (DS) and wet (WS) seasons from seven sampling zones along Indus River and the physical, bacteriological, and chemical parameters determining water quality were quantified. There were marked temporal and spatial variations in the water quality of Indus River. The magnitude of pollution was high in WS compared with DS. The quality of water varied across the sampling zones, and it greatly depended upon the nature of effluents entering the river. Water samples exceeded the WHO permissible limits for pH, EC, TDS, TS, TSS, TH, DO, BOD, COD, total coliforms, Escherichia coli, Ca, Mg, NO, and PO. Piper analysis indicated that water across the seven sampling zones along Indus River was alkaline in nature. Correlation analyses indicated that EC, TDS, TS, TH, DO, BOD, and COD may be considered as key physical parameters, while Na,...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
h i g h l i g h t s New ferrocenyl phenylguanidines. Preliminary investigation of anticancer pote... more h i g h l i g h t s New ferrocenyl phenylguanidines. Preliminary investigation of anticancer potency. DNA binding studies by UV and CV. High binding constant values (K b = 10 5). Good free radical scavengers. g r a p h i c a l a b s t r a c t The DNA binding potency of the synthesized guanidines (1-6) were determined by UV-Vis spectrophotometer and cyclic voltammeter by keeping the concentration of the compounds constant (A) while varying the amount of DNA (B-H). All the compounds showed electrostatic mode of interaction with DNA having impressively high binding constants values (9.9 Â 10 4-1.3 Â 10 5 (M À1)). The compounds also showed good antioxidant activities. These two parameters are helpful to design new anticancer drugs.
... 1,1-Organoboration, using triethyl-, triallyl-and triphenyl-borane (BEt3, BAll3, BPh3), of di... more ... 1,1-Organoboration, using triethyl-, triallyl-and triphenyl-borane (BEt3, BAll3, BPh3), of dimethysilylethynyl(trimethyl)stannane, Me3SnCCSi(H)Me2 (1), affords alkenes bearing three different organometallic groups at the CC bond. ... bond and ...
To quantify the impact of horse purslane (Trianthema portulacastrum) on the yield and yield compo... more To quantify the impact of horse purslane (Trianthema portulacastrum) on the yield and yield components of maize, experiments were conducted at Agricultural Research Farm, NWFP Agricultural University Peshawar, Pakistan for two crop seasons viz., 2006 and 2007, using open pollinated variety 'Azam'. The experiments were laid out in Randomized Complete Block (RCB) design with split plot arrangements having three replications. Four maize plant spacings (15, 20, 25 and 30 cm) were kept in main plots, while weed densities (3, 6, 9, 12, 15 and 18 m-2) were allotted to sub plots. Narrow plant spacing of 15 cm produced higher grain yield of 2.85 and 2.66 t ha-1 as compared to 2.30 and 2.08 t ha-1 in wider plant spacing of 30 cm during 2006 and 2007, respectively. However, during both years, yield components of individual plants were negatively affected with a decrease in plant spacing. Similarly, control plots produced higher grain yield of 3.04 and 2.87 t ha-1 as compared to grain yield of 2.14 and 2.0 t ha-1 in plots having weed density of 18 plants m-2 in 2006 and 2007, respectively. Losses due to T.
Acta Crystallographica Section E Structure Reports Online, 2006
Acta Cryst. (2006). E62, m1192-m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] m1193 metal-organ... more Acta Cryst. (2006). E62, m1192-m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] m1193 metal-organic papers m1194 Ahmad et al. [Sn(C 4 H 9) 3 (C 7 H 9 O 2)] Acta Cryst. (2006). E62, m1192-m1194 supporting information sup-1
Acta Crystallographica Section E Structure Reports Online, 2006
The molecular structure of the title compound, tetra-μ2-(cyclopent-2-enyl)acetato-1:2κ2 O:O′;1:3κ... more The molecular structure of the title compound, tetra-μ2-(cyclopent-2-enyl)acetato-1:2κ2 O:O′;1:3κ2 O:O′;2:4κ2 O:O′;3:4κ2 O:O′-octaethyl-1κ2 C,2κ2 C,3κ2 C,4κ2 C-di-μ3-oxo-1:2:3κ3 O;2:3:4κ3 O-tetratin, [Sn4(C2H5)8(C7H9O2)4O2], is composed of two independent centrosymmetric dimers lying about inversion centers. In each dimer, the central Sn2O2 core is fused with two four-membered (Sn2O2) and two six-membered (Sn2O3C) rings. The endocyclic Sn atoms are six-coordinate in a skew-trapezoidal bipyramidal environment. The exocyclic Sn atoms are five-coordinate and show disotorted trigonal–bipyramidal geometry. The cyclopentenylacetate ligand shows different modes of coordination with tin. In both dimers, the Sn—C distances lie in a very narrow range [2.118 (4)–2.134 (4) Å], while the Sn—O distances range between 2.042 (2) and 2.314 (3) Å for strong bonds and between 2.638 (3) and 2.658 (3) Å for relatively weaker Sn—O bonds.
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