Synthesis and X-ray crystallographic studies of Ni (II) and Cu (II) complexes of [5-(4-pyridyl)-1,3,4] oxadiazole-2-thione/thiol formed by transformation of N-(pyridine-4-carbonyl)-hydrazine carbodithioate in the presence of ethylenediamine

Singh, Nand K.; Bharty, M.K.; Dulare, Ram; Butcher, Ray J.

doi:10.1016/j.poly.2009.04.030

Cited by 29 publications

(15 citation statements)

References 27 publications

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“…The above-observed intermolecular hydrogen bonding stabilized the crystal packing giving a supramolecular network. The geometry and bonding parameters agree with those of other Ni/Co complexes containing ethylenediamine [29,30]. The soft donor site of the mtt − ligand shows no tendency for coordination with Ni(II) and Co(III), as they are hard metal ions and prefer to bind with comparatively hard nitrogen of the ligand.…”

Section: Crystal Structure Descriptionsupporting

confidence: 73%

Ni(II) and Co(III) complexes of 5-methyl-1,3,4-thiadiazole-2-thiol: syntheses, spectral, structural, thermal analysis, and DFT calculation

Dani

Bharty

Prakash

et al. 2015

Journal of Coordination Chemistry

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Two new complexes, [Ni(en) 2 (mtt) 2 ] (1) and [Co(en) 2 (mtt) 2 ](mtt) (2) (Hmtt = 5-methyl-1,3,4-thiadiazole-2-thiol and en = ethylenediamine), have been synthesized and characterized by various physicochemical techniques. Complexes 1 and 2 crystallize in monoclinic and orthorhombic system with space groups P 21/n and P 21 21 21, respectively. The molecular structures of 1 and 2 show that the metal ions are six-coordinate bonded through four equatorial nitrogens of two en and two axial nitrogens of mtt ligands. The crystal structures of the complexes reveal that mtt is present in thione form and bound to the metal ion through the thiadiazole nitrogen. The crystal structures of the complexes are stabilized by various intermolecular hydrogen bonding providing supramolecular architecture. Complex 2 is also stabilized by weak π···π interactions occurring between two thiadiazole rings. The bioefficacies of the ligand and complexes have been examined against the growth of bacteria to evaluate their antimicrobial potential. The biological results suggest that 2 is more active than the ligand and 1 against the tested bacteria. The geometries of the ligand and the complexes have been optimized by the DFT method and the results are compared with the X-ray diffraction data. The Co(III) complex exhibits an irreversible Co(III)/Co(II) process while the Ni(II) complex displays quasi-reversible Ni(II)/Ni(III) redox processes with large peak separation as compared to that expected for a one electron process which is thought to be coupled with some chemical reaction.*Corresponding authors.

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Section: Crystal Structure Descriptionsupporting

confidence: 73%

Ni(II) and Co(III) complexes of 5-methyl-1,3,4-thiadiazole-2-thiol: syntheses, spectral, structural, thermal analysis, and DFT calculation

Dani

Bharty

Prakash

et al. 2015

Journal of Coordination Chemistry

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“…The thioamide ligands bond in a monodentate manner and the complexes are invariably octahedral. As an example, 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione results in thiolates with Hg and Cd, [20] and thioamides with Ni, [21] Cu, [21] Zn, [21] and Mn. [22,23] A search of the Cambridge Crystallographic Database [24] shows a similar trend is observed with analogous ligands 5-(R)-1,3,4-oxadiazole-2-thione, where R = pMeOPh and 2-Pyr.…”

Section: Resistant Staphylococcus Aureus (Mrsa) Vancomycin-resistantmentioning

confidence: 99%

Powerful Antibacterial Activity of Phenyl‐Thiolatobismuth(III) Complexes Derived from Oxadiazolethiones

et al. 2015

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Seven novel 5‐substituted phenylthiazole oxadiazolethiones: [Me‐PTOT(H)], [MeO‐PTOT(H)], [MeS‐PTOT(H)], [F‐PTOT(H)], [Cl‐PTOT(H)], [Br‐PTOT(H)], and [CF3‐PTOT(H)], {where X‐PTOT(H) = 5‐[2‐(4‐X)thiazol‐4‐yl]‐1,3,4‐oxadiazole‐2(3H)‐thione, 4‐X = C6H4}, were synthesised from their corresponding thioamides. From these seven heteroleptic thiolatobismuth complexes: BiPh(Me‐PTOT)2 6, BiPh(MeO‐PTOT)2 7, BiPh(MeS‐PTOT)2 8, BiPh(F‐PTOT)2 9, BiPh(Cl‐PTOT)2 10, BiPh(Br‐PTOT)2 11 and BiPh(CF3‐PTOT)2 12 were synthesised and characterised. Complexes [10(DMSO)2] and [11(DMSO)2] were structurally characterised using X‐ray diffraction. Evaluation of the antibacterial properties of the thiones and their BiIII complexes against Mycobacterium smegmatis, Staphylococcus aureus (S. aureus), Methicillin‐resistant Staphylococcus aureus (MRSA), Vancomycin‐resistant Enterococcus (VRE), Enterococcus faecalis (E. faecalis) and Escherichia coli (E. coli) showed that all bismuth(III) complexes were highly effective against all the bacteria, as demonstrated by very low MIC values (1.1–2.1 μM). Complexes BiPh(Me‐PTOT)2 6, BiPh(Cl‐PTOT)2 10 and BiPh(Br‐PTOT)2 11, showed best activity against the multi‐drug resistant bacteria VRE and MRSA with an MIC value of 1.0 μM. All these complexes and their corresponding thiones failed to show any prominent activity against M. smegmatis and E. coli, even at high concentrations. These complexes showed little or no toxicity towards mammalian COS‐7 cells at 20 μg/mL.

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“…The thioamide ligands bond in a monodentate manner and the complexes are invariably octahedral. As an example, 5‐(4‐pyridyl)‐1,3,4‐oxadiazole‐2‐thione results in thiolates with Hg and Cd,20 and thioamides with Ni,21 Cu,21 Zn,21 and Mn 22,23. A search of the Cambridge Crystallographic Database24 shows a similar trend is observed with analogous ligands 5‐( R )‐1,3,4‐oxadiazole‐2‐thione, where R = p ‐MeOPh and 2‐Pyr.…”

Section: Introductionmentioning

confidence: 99%

Recycling Nanowire Templates for Multiplex Templating Synthesis: A Green and Sustainable Strategy

Wang

Liu

et al. 2015

Chemistry A European J

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Template-directed synthesis of nanostructures has been emerging as one of the most important synthetic methodologies. A pristine nanotemplate is usually chemically transformed into other compounds and sacrificed after templating or only acts as an inert physical template to support the new components. If a nanotemplate is costly or toxic as waste, to recycle such a nanotemplate becomes highly desirable. Recently, ultrathin tellurium nanowires (TeNWs) have been demonstrated as versatile chemical or physical templates for the synthesis of a diverse family of uniform 1D nanostructures. However, ultrathin TeNWs as template are usually costly and are discarded as toxic waste in ionic species after chemical reactions or erosion. To solve the above problem, we conceptually demonstrate that such a nanotemplate can be economically recycled from waste solutions and repeatedly used as template.

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Synthesis and X-ray crystallographic studies of Ni (II) and Cu (II) complexes of [5-(4-pyridyl)-1,3,4] oxadiazole-2-thione/thiol formed by transformation of N-(pyridine-4-carbonyl)-hydrazine carbodithioate in the presence of ethylenediamine

Cited by 29 publications

References 27 publications

Ni(II) and Co(III) complexes of 5-methyl-1,3,4-thiadiazole-2-thiol: syntheses, spectral, structural, thermal analysis, and DFT calculation

Ni(II) and Co(III) complexes of 5-methyl-1,3,4-thiadiazole-2-thiol: syntheses, spectral, structural, thermal analysis, and DFT calculation

Powerful Antibacterial Activity of Phenyl‐Thiolatobismuth(III) Complexes Derived from Oxadiazolethiones

Recycling Nanowire Templates for Multiplex Templating Synthesis: A Green and Sustainable Strategy

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