Cu−Pd−Cu and Cu−Pt−Cu Linear Frameworks: Synthesis, Magnetic Properties, and Theoretical Analysis of Two Mixed-Metal Complexes of Dipyridylamide (dpa), Isostructural, and Isoelectronic with [Cu3(dpa)4Cl2]+

Autor:	Marc Bénard, Isiah Po-Chun Liu, Shie-Ming Peng, Gene-Hsiang Lee, Marie-Madeleine Rohmer
Rok vydání:	2007
Předmět:	Chemistry Crystal structure law.invention Inorganic Chemistry Crystallography Transition metal Heteronuclear molecule Computational chemistry Superexchange law Antiferromagnetism Physical and Theoretical Chemistry Isostructural Valence electron Electron paramagnetic resonance
Zdroj:	Inorganic Chemistry. 46:9602-9608
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic070319l
Popis:	The synthesis and crystal structure of two heteronuclear compounds stabilized by four dipyridylamide (dpa) ligands is reported. Cu 2 Pd(dpa) 4 Cl 2 (1) and Cu 2 Pt(dpa) 4 Cl 2 (2) exhibit an approximate D 4 symmetry and a linear metal framework. They are structurally similar to the homotrinuclear complexes M 3 (dpa) 4 L 2 already characterized with various transition metals (M = Cr, Co, Ni, Cu, Rh, Ru). With 26 metal valence electrons, they are also isoelectronic to the oxidized form of the tricopper complex [Cu 3 (dpa) 4 Cl 2 ] + (3), previously characterized and investigated by Berry et al. 10 The magnetic properties and the EPR spectra of 1 and 2 are reported. The results for 1 are interpreted in terms of a weak antiferromagnetic interaction (2J = -7.45 cm -1 within the framework of the Heisenberg Hamiltonian H = -2J AB S A S B ) between the Cu(ll) magnetic centers. For 2, the antiferromagnetic interaction sharply decreases to
Databáze:	OpenAIRE
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