Structure and magnetic properties of one-dimensional metal complexes constructed from alternating dicyanamide linked through binuclear metal tetra-2-pyridylpyrazine subunits

doi:10.1016/j.poly.2004.12.010

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Title:	Structure and magnetic properties of one-dimensional metal complexes constructed from alternating dicyanamide linked through binuclear metal tetra-2-pyridylpyrazine subunits
Authors:	Hsu, Guang-Yuan;Chen, Chin-Wang;Cheng, Sung-Chung;Lin, Shin-Huang;魏和祥;Wei, Ho-hsiang;Lee, Chin-Jhin
Contributors:	淡江大學化學學系
Keywords:	Crystal structure;Dicyanamide;Magnetic properties;Metal complexes;Tetra-2-pyridylpyrazine
Date:	2005-03-10
Issue Date:	2009-12-01
Publisher:	Kidlington: Pergamon
Abstract:	The syntheses, structures and magnetic properties of three 1-D complexes with the formulae [Co2(tppz)(dca)4] (1), [Ni2(tppz)(dca)4]C2H5OH (2) and [Cu2(tppz)(dca)(Cl)2](dca) · H2O (3), where tppz = tetra-2-pyridylpyrazine and dca = dicyanamide, are described. Complexes 1–3 are one-dimensional metal-complexes. In 1 the dinuclear tppz-chelated Co(II) centers are linked by two double μ1,5-dca ligands. Compound 2 forms a ladder-like structure in which the rungs are formed by bis-chelating tppz bridged dinuclear Ni(II) ions and the uprights by μ1,5-dca units. Compound 3 forms a helical chain structure which consists of alternately single μ1,5-dca linked dinuclear tppz-chelated Cu-centers. The temperature dependence of magnetic measurements show antiferromagnetic couplings between two metal ions with a pathway through tppz and μ1,5-dca in all cases, with J = −1.10 cm−1, J′ = −0.05 cm−1 for 1, J = −1.28 cm−1, J′ = −0.11 cm−1 and D = 9.50 cm−1 for 2, and J = −10.26 cm−1, J′ = −0.06 cm−1 for 3.
Relation:	Polyhedron 24(4), pp.487-494
DOI:	10.1016/j.poly.2004.12.010
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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