Diphenic Acid-Based Cobalt(II) Complexes: Trinuclear and Double-Helical Structures

作者：Malaestean Iurii L; Speldrich Manfred; Baca Svetlana G; Ellern Arkady; Schilder Helmut; Koegerler Paul

来源：European Journal of Inorganic Chemistry, 2009, 2009(8): 1011-1018.

DOI：10.1002/ejic.200801138

• Cobalt
• Carboxylate ligands
• Coordination polymers
• Magnetic properties
• N ligands

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-Melm = 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 Coll 4 F free ion ground state and ferro- and antiferromagnetic exchange contributions mediated by the dpa ligands.

• 出版日期2009-3