Binuclear Nickel(II) and Cobalt(III) Complexes with Dissimilar Bridges: Synthesis, Spectroscopy, Crystal Structure, and Magnetism

✍ Scribed by Qing-Lun Wang; Li-Hua Yu; Dai-Zheng Liao; Shi-Ping Yan; Zong-Hui Jiang; Peng Cheng

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: German
• Weight: 218 KB
• Volume: 86
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.200390197

✦ Synopsis

Abstract

Two novel binuclear nickel(II) and cobalt(III) complexes with two or three dissimilar bridges, Ni~2~(tacn)~2~(μ‐N~3~)~2~(μ‐O~2~CPh)⋅H~2~O (1) and Co~2~(tacn)~2~(μ‐N~3~)(μ‐OH)(μ‐O~2~CPh)~3~ (2) (tacn=1,4,7‐triazacyclononane), were synthesized and structurally as well as magnetically characterized. Both compounds have a discrete binuclear structure, bridged by two N~3~^−^ ions and one carboxylato group of the benzoate ion for 1 and one N~3~^−^ ion, one carboxylato group of the benzoate ion, and one hydroxy group for 2; the macrocyclic ligand tacn acts as terminal ligand. The magnetic data of compound 1 were analyzed by means of Ĥ = −2__JŜ__~1~Ŝ~2~−D(Ŝ~1~^2^+Ŝ~2~^2^), leading to J = 19.6 cm^−1^, g=2.07, D = 4.01 cm^−1^, and zJ′ = $\rm{-}$0.32 cm^−1^. The ferromagnetic interaction is discussed on the basis of the structural features.