Preparation, structural and physical studies of mercury(II) halide complexes with the N,N′-chelating biheteroaromatic ligand 2-(2′-pyridyl)quinoxaline

Kasselouri, S; Garoufis, A; Paschalidou, S; Perlepes, SP; Butler, IS; Hadjiliadis, N

dc.contributor.author	Kasselouri, S	en
dc.contributor.author	Garoufis, A	en
dc.contributor.author	Paschalidou, S	en
dc.contributor.author	Perlepes, SP	en
dc.contributor.author	Butler, IS	en
dc.contributor.author	Hadjiliadis, N	en
dc.date.accessioned	2014-03-01T01:42:41Z
dc.date.available	2014-03-01T01:42:41Z
dc.date.issued	1994	en
dc.identifier.issn	00201693	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23893
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0010111753&partnerID=40&md5=9fd3abb82ea924010dafd2228c753c8a	en
dc.subject	Bidentate ligand complexes	en
dc.subject	Chelate complexes	en
dc.subject	Crystal structures	en
dc.subject	Dinuclear complexes	en
dc.subject	Mercury complexes	en
dc.title	Preparation, structural and physical studies of mercury(II) halide complexes with the N,N′-chelating biheteroaromatic ligand 2-(2′-pyridyl)quinoxaline	en
heal.type	journalArticle	en
heal.publicationDate	1994	en
heal.abstract	The mercury(II) complexes [Hg2X4L2] (X = Cl, Br) and [HgI2L], where L is 2-(2′-pyridyl)quinoxaline, have been prepared and studied by a combination of conductivity measurements and FT-IR and far-IR, Raman and 1H NMR spectroscopy. The structures of the free ligand L and [Hg2Cl4L2] have been determined from three-dimensional X-ray data collected by counter methods. Compound L crystallizes in space group P21/c with a = 4.163(2), b = 16.953(4), c = 14.509(3) Å, β = 94.79(2)° and Z=4. The complex [Hg2Cl4L2] crystallizes in space group P21/n with a = 7.627(3), b = 15.617(4), c = 11.099(4),β=92.03(3)° and Z = 2. In free L, the pyridine nitrogen and the nearest quinoxaline nitrogen are located on the opposite side of the carboncarbon bond which connects the two rings; the reverse conformation has been observed on complexation. The structure of [Hg2Cl4L2] consists of two Hg(II) centres bridged by two chloro ligands, with a terminal chloride and a chelating molecule of L completing five-coordination at each metal. The geometry at mercury is a distorted trigonal bipyramid with the bridging chlorides occupying apical and equatorial sites of each Hg(II) atom. The bromo compound is isostructural with [Hg2Cl4L2], while a monomeric pseudotetrahedral structure is assigned for the iodo complex in the solid state. © 1994.	en
heal.journalName	Inorganica Chimica Acta	en
dc.identifier.volume	227	en
dc.identifier.issue	1	en
dc.identifier.spage	129	en
dc.identifier.epage	136	en