Synthesis, spectroscopic and magnetic properties of the first heterotrimetallic complexes of cobalt(II) featuring nonaalkoxodistannate or -dititanate ligands

Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India E-mail : anirudhsinghunivjpr@yahoo.co.in Manuscript received 19 February 2006, revised 4 April 2007, accepted 9 April 2007 Novel heterotrimetallic alkoxides of the type [Co{M2(OR)9}{M'(OR')n }] [M=Sn, M'=AI (n = 4), R=R'=Prj (1); M=Sn, M'=Nb (n=6), R=R'= Prj (2); M=Ti, M'=AI (n=4), R=R' = Pri (3); M=Ti, M'=Nb (n=6), R=R'=Pri (4); M=Sn, M'=AI (n=4), R=R'=Et (5); M=Ti, M'=AI (n=4), R=R'=Et (6); M = Sn, M'=AI (n=4), R=Et, R'=Pri (7); M=Sn, M'=Nb (n=6), R=Et, R'=Pri (8); M=Ti, M'=AI (n=4), R=Et, R'=Pri (9); M=Ti, M'=Nb (n=6), R=Et,R' =Pri (10)] have been synthesized for the nrst time by the reactions of dimeric chloro(nonaalkoxo- istannato and -dititanato)cobalt(ll) complexes A-D with two-fold excess of an appropriate alkali metal alkoxometallate such as KAI(OPri)4, KAI(OEt)4 and KNb(OPri)6 in benzene medium. These heterotrimetallic alkoxides have been characterized by elemental analyses and IR, electronic, magnetic susceptibility and molecular weight measurements