The effect of second-sphere coordination. 7. Isolation of 18-crown-6 ether adducts of ruthenium-ammine complexes
1998; Elsevier BV; Volume: 282; Issue: 2 Linguagem: Inglês
10.1016/s0020-1693(98)00241-2
ISSN1873-3255
AutoresIsao Ando, Motoharu Higashi, Kikujir Ujimoto, Hirondo Kurihara,
Tópico(s)Analytical Chemistry and Sensors
Resumo18-Crown-6 ether adducts were isolated for ruthenium(II)- and ruthenium(III)-ammine complexes, and the mixed-valence binuclear ruthenium-ammine complex. The adducts were characterized by electronic and IR spectroscopy. Ruthernium-ammine complexes form adducts with 18-crown-6 ether through hydrogen bonding between ammines coordinating to the ruthenium and ether oxygens of 18-crown-6 ether. The composition of the adducts is dependent on the valence of the metal canter: the composition was found to be 1:12, 1:2, and 1.3 (complex to 18-crown-6 ether) for the ruthenium (III complex, and the mixed-valence binuclear binuclear complex respectively. The adduct of the ruthenium (III) complex has a unusual composition: two molecules of 18-crown-6 ether are involved in the adduct. Furthermore, the delocalized mixed-valence binuclear complex formed an asymmetric adduct similar to that formed by a binuclear complex with fixed valence.
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