Crystal structures and magnetic properties of mercurry(II) bromide complexes with phyridyl-substituted N-oxyl N'-oxides(nitronyl nitroxides)

doi:10.1039/A704999D

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Title:	Crystal structures and magnetic properties of mercurry(II) bromide complexes with phyridyl-substituted N-oxyl N'-oxides(nitronyl nitroxides)
Authors:	Lee, C. J.;Hung, C. H.;魏和祥;Wei, Ho-hsiang;Liu, Y. H.;Lee, G. H.;Wang, Yu
Contributors:	淡江大學化學學系
Date:	1998
Issue Date:	2009-12-01
Publisher:	Royal Society of Chemistry (RSC)
Abstract:	The crystal structures have been determined and magnetic properties investigated for four novel HgBr2 complexes with pyridyl-substituted ‘nitronyl nitroxides’, 4,4,5,5-tetramethyl-2-(4-pyridyl)-(L1), -2-(2-pyridyl)-(L2), -2-(3-pyridyl)-(L3) and -2-(6-methyl-2-pyridyl)-2-imidazoline N 1-oxyl N 3-oxide (L4). Complex 1, [HgBr2L1], is mononuclear, in which mercury(II) has planar trigonal co-ordination core, from two bromide atoms and one nitrogen atom of the pyridyl group. In 2, [HgBr2L2] the HgII atom has distorted-tetrahedral four co-ordination involving two bromide atoms and chelating by oxygen and nitrogen atoms of the L2 ligand. Complex 3, [(HgBr)3L32], is a zigzag polymeric chain with a distorted T-shaped HgBr2L3 unit and self-assembly involving co-ordination by an oxygen atom of the nitroxide groups. Complex 4, [(HgBr2)3L42], is a quasi-linear chain with HgBr2L4 moieties and HgBr2 cores. Cryomagnetic susceptibility measurements (4–300 K) showed that 1 and 3 exhibit a weak intermolecular alternating one-dimensional antiferromagnetic exchange interaction, while 3 and 4 possess weak one-dimensional antiferromagnetic and ferromagnetic exchange interactions respectively. A simple spin-polarization model has been used to justify the observed ferromagnetic exchange interaction between the spins of the radical NO group in complex 4.
Relation:	Journal of the Chemical Society. Dalton Transactionsn 1, pp.171-176
DOI:	10.1039/A704999D
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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