Structure and magnetic properties of 2,2′-bipyrimidine-(bpym)-bridged binuclear MnII complex: [Mn2(H2O)6(bpym)(SO4)2]

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Title:	Structure and magnetic properties of 2,2′-bipyrimidine-(bpym)-bridged binuclear MnII complex: [Mn2(H2O)6(bpym)(SO4)2]
Authors:	Hong, D. M.;Chu, Y. Y.;魏和祥;Wei, Ho-hsiang
Contributors:	淡江大學化學學系
Date:	1996-02-01
Issue Date:	2009-12-01
Publisher:	Elsevier
Abstract:	A binuclear MnII complex of the formula [Mn2(H2O)6(bpym)(SO4)2] (bpym = 2,2′-bipyrimidine) has been prepared and its structure and magnetic properties have been determined by X-ray diffraction, ESR and magnetic susceptibility measurements. The structure consists of two MnII ions bridged by bis-bidentate bpym ligands and coordinated by H2O and SO42− groups to make a binuclear neutral [Mn2(H2O)6(bpym)(SO4)2] unit. The coordination geometry around the manganese atom is that of a highly distorted octahedron: The averaged MnIIN distance (2.31 Å) is longer than those of the MnIIO (2.16 Å) of H2OMnII and MnIIO (2.069 Å) of SO42−MnII. The configuration of coordinated SO42− groups has a disorder with a 6:4 rattio. X-band ESR spectra of the complex in water shows an isotropic signal with g = 2.007 and A = 94 G. Cryomagnetic investigations (4–300 K) reveal a weak antiferromagnetic spin exchange with J = −9.96 cm−1 between manganese(II) cations through the bpym bridge.
Relation:	Polyhedron 15(3), pp.447-452
DOI:	10.1016/0277-5387(95)00284-Y
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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