Synthesis and structures of bis[bis(trimethylsilyl)amido]-tin(IV) cyclic chalcogenides [{Sn[N(SiMe3)2]2(µ-E)}2] and a heterobimetallic analogue [{(Me3Si)2N}2Ge(µ-Te)2Sn-{N(SiMe3)2}2](E = S, Se or Te)
摘要:
Each of the four-membered ring compounds [{Sn[N(SiMe(3))(2)](2)(mu-E)}(2)] (E = S 1, Se 2 or Te 3) has been prepared by the oxidative addition of the chalcogen E to Sn[N(SiMe(3))(2)](2) promoted by sonication in a faster reaction and in a higher yield than previously achieved. The first heterobimetallic analogues [{(Me(3)Si)(2)N}Ge-2(mu-E)(2)Sn{N(SiMe(3))(2)}(2)] (E = Te 4 or Se 5) were obtained similarly from a mixture of the two metal(II) amides and the chalcogen. Compounds 1-4 have been characterised by single crystal X-ray diffraction and 1-5 studied by NMR spectroscopy [H-1, C-13, Si-29, Se-77, Sn-177, Sn-179, Te-125 and (by the insensitive nuclei enhanced by polarization transfer technique) N-15].