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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4095
Title: Hg(II) complexes of 4-phenyl-5-(3-pyridyl)-1,2,4-triazole-3-thione and 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione and a Ni(II) complex of 5-(thiophen-2-yl)-1,3,4-oxadiazole-2-thione: Synthesis and X-ray structural studies
Authors: Bharti A.
Bharty M.K.
Kashyap S.
Singh U.P.
Butcher R.J.
Singh N.K.
Published in: Polyhedron
Abstract: Three new mixed ligand complexes, [Hg(en)(4-pptt)2] (2) {4-pptt = 4-phenyl-5(3-pyridyl)-1,2,4-triazole-3-thione}, [Hg(en)(4-pot)2] (3) {4-pot = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione} and [Ni(en) 2(5-thot)2] (4) {5-thot = 5-(thiophen-2-yl)-1,3,4- oxadiazole-2-thione}, have been prepared containing en as a co-ligand. It is observed that 5-(pyridine-4-carbonyl) hydrazine carbodithioic acid methyl ester undergoes cyclization during complexation with Hg(II) in the presence of ethylenediamine and formed complex 3 containing 5-(4-pyridyl)-1,3,4-oxadiazole- 2-thione. The metal complexes have been characterized with the aid of elemental analyses, IR, magnetic susceptibility and single crystal X-ray studies. The ligand 4-pptt (1) and complexes 2, 3 and 4 crystallize in the monoclinic system, space group P21/n, P21/c, P121/c1 and P21/n respectively. The ligand is present in the deprotonated thiol form in complexes 2 and 3, and is bonded covalently through sulfur, while in complex 4 the ligand 5-(thiophen-2-yl)-1,3,4- oxadiazole-2-thione is present as the thione form and is bonded to Ni(II) through the oxadiazole nitrogen. Complex 4 shows quasi-reversible redox behavior assignable to a Ni2+/Ni3+ one electron transfer. The photoluminescence properties indicate that the complexes are fluorescent materials with maximum emissions at 433, 376 and 465 nm for complexes 2, 3 and 4 at excitation wavelengths of 293, 273 and 327 nm, respectively. All the complexes contain extended hydrogen bonding that provides a supramolecular framework. © 2012 Elsevier Ltd. All rights reserved.
Citation: Polyhedron (2013), 50(1): 582-591
URI: https://doi.org/10.1016/j.poly.2012.11.043
http://repository.iitr.ac.in/handle/123456789/4095
Issue Date: 2013
Keywords: Hg(II) and Ni(II) complexes
Intermolecular and intramolecular hydrogen bonding
Mixed ligand complexes
Oxadiazole complexes
Triazole complex
ISSN: 2775387
Author Scopus IDs: 57204459843
14065956900
26537562100
57203181883
7201947292
35412427900
Author Affiliations: Bharti, A., Department of Chemistry, Banaras Hindu University, Varanasi 221005, India
Bharty, M.K., Department of Chemistry, Banaras Hindu University, Varanasi 221005, India
Kashyap, S., Department of Chemistry, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India
Singh, U.P., Department of Chemistry, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India
Butcher, R.J., Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, United States
Singh, N.K., Department of Chemistry, Banaras Hindu University, Varanasi 221005, India
Funding Details: One of the authors (R.J.B.) acknowledges the X-ray diffractometer. Thank are also due to Prof. S.K. Gupta, visiting from School of Studies in Chemistry, Jiwaji University, Gwalior-474 011, Gwalior, MP, India as a Fulbright-Nehru Fellow in the laboratory of R.J.B., who worked on the structure. NSF-MRI program (Grant No. CHE0619278 ) for funds to purchase the Appendix A
Corresponding Author: Bharty, M.K.; Department of Chemistry, Banaras Hindu University, Varanasi 221005, India; email: mkbharty@bhu.ac.in
Appears in Collections:Journal Publications [CY]

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