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Strong Antiferromagnetism in Isolated Anionic Dicopper(II) Methanoato Paddle-wheel Complex.

Authors :
Kozlevčar, Bojan
Kovšca, Igor
Jagličić, Zvonko
Pevec, Andrej
Kitanovski, Nives
Strauch, Peter
Šegedin, Primož
Source :
Croatica Chemica Acta. Nov2009, Vol. 82 Issue 2, p463-467. 5p. 1 Diagram, 2 Charts, 3 Graphs.
Publication Year :
2009

Abstract

A new ionic compound (C5H6NO)2 [Cu2(μ-O2CH)4(O2CH)2], 1 formed of 4-hydroxypyridinium cations and a complex anion was synthesized. The anion is a paddle-wheel dicopper carboxylate complex with four syn,syn-bridging and two axial anionic methanoato ligands. The XRD structure determination of 1 reveals that the molecular structure is stabilized by two H-bonds between the cations and the axial paddle-wheel anions (N-H…O 2.755(3), O-H…O 2.489(2) Å). The compound exhibits a very strong (2J = 500 cm-1) intra-binuclear antiferromagnetic interaction noticed already at room temperature attributed to the methanoato intra-binuclear bridges. The typical EPR S = 1 spin system signals of the dicopper paddle-wheel complexes at 90 and 450-700 mT are found in the room temperature spectrum, but they are poorly seen in the 110 K spectrum. These signals are of very low intensity and are accompanied by a dominant signal at 320 mT, all closely related to a very strong antiferromagnetic interaction present in 1. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00111643
Volume :
82
Issue :
2
Database :
Academic Search Index
Journal :
Croatica Chemica Acta
Publication Type :
Academic Journal
Accession number :
44289343