Cobalt complexes of a selenium diimide and a tellurium diimide dimer
摘要:
[CoCl(2){N,N'-Te(2)(N(t)Bu)(4)}] (1) was obtained in good yields by the reaction of equimolar amounts of ((t)Bu)N-Te(mu-N(t)Bu)(2)TeN((t)Bu) and CoCl(2) in toluene under an argon atmosphere. The crystal structure of 1 center dot CH(2)Cl(2) showed that the dimeric tellurium diimide ligand is N,N'-chelated to cobalt. The related reaction of Se(N(t)Bu)(2) and CoCl(2) affords a green product tentatively identified as a 1:1 adduct [CoCl(2){N,N'-Se(N(t)Bu)(2)}] (CHN analysis). However, recrystallization from thf produces the ion-separated complex [Co(2)(mu-Cl)(3){N,N'-Se(N(t)Bu)(2)}(2)(thf)(2)][CoCl(3){NH(2)((t)Bu)}]center dot 11/2thf (2.11/2thf), in which the monomeric selenium diimide ligand is N,N'-chelated to cobalt in the cation. A pathway for the formation of 2 from [CoCl(2){N,N'-Se(NtBu)(2)}] in thf is proposed. (c) 2009 Elsevier Ltd. All rights reserved.