Cobalt complexation with unsymmetrical tripodal ligands

Abstract

The reaction of the aliphatic unsymmetrical tripod [N(CH2CH 2NH2)2(CH2CH2OH)], H 5-1, with cobalt(II) chloride in THF yields after aerial oxidation the dinuclear complex [(H4-1)CoIII(μ-OH)Co III(H4-1)](CoIICl4)Cl, [5](CoCl 4)Cl. The trianion 53- contains two cobalt atoms triply bridged by two alkoxo groups of the singly deprotonated ligand (H 4-1)- and a hydroxo group. The new ligand [N(CH 2CH2CH2NH2)(CH2CH 2OH)2], H4-3, providing an N2O 2 donor set reacts with cobalt(II) chloride to give after aerial oxidation the hexanuclear complex [CoIII4(H 2-3)4CoII2(HOMe)2Cl 2(μ-OH)4], [6]Cl2, containing an unprecedented mixed-valent CoIII4CoII2 core. © 2005 Verlag der Zeitschrift für Naturforschung.