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Diphenic Acid‐Based Cobalt(II) Complexes: Trinuclear and Double‐Helical Structures
Author(s) -
Malaestean Iurii L.,
Speldrich Manfred,
Baca Svetlana G.,
Ellern Arkady,
Schilder Helmut,
Kögerler Paul
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200801138
Subject(s) - chemistry , pyrazine , crystallography , cobalt , ligand (biochemistry) , molecule , coordination complex , stereochemistry , coordination polymer , antiferromagnetism , solid state , crystal structure , metal , inorganic chemistry , organic chemistry , biochemistry , receptor , physics , condensed matter physics
The linear trinuclear complex [Co 3 (dpa) 2 (Hdpa) 2 (1‐MeIm) 2 (H 2 O) 2 ] ( 1 ) and the two‐dimensional coordination polymer [Co 2 (dpa) 2 (pyz)] n ( 2 ; H 2 dpa = diphenic acid, 1‐MeIm = 1‐methylimidazole, pyz = pyrazine) exemplify the versatile coordination chemistry of diphenic acid in conjunction with N‐donor ligands. Complex 1 consists of a discrete arrangement of three Co II atoms bridged by four diphenate ligands, whereas complex 2 contains a network of dinuclear Co II units bridged by two diphenate ligands to form double‐helical chains, which are further connected via pyrazine molecules into two‐dimensional sheets. A magnetochemical analysis of these complexes reveals both strong ligand field effects on the Co II 4 F free ion ground state and ferro‐ and antiferromagnetic exchange contributions mediated by the dpa ligands. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)