Abstract
AbstractCyclic bis(amido)tin(II) compounds 1,2‐ [R = SiMe3] (4), SiMe2But (5) and CH2But (6)], as well as (4)2(μ‐tmeda) 7 have been obtained either from (i) the corresponding dilithium compound 1,2‐C6H4[N(R)Li]2 1–3 and SnCl2 for 4–6, respectively, (or for 4) 2 1 + [Sn(μ‐Cl){N(SiMe3)2}]2; or (ii) 1,2‐C6H4[N(H)R]2 + Sn[N(SiMe3)2]2 for 4–6; or for 7 from 4 and tmeda. Compounds 4–6 are monomeric, yellow, thermochromic (becoming redder on heating), diamagnetic, crystalline and are lipophilic and sublimable in vacuo. Compound 7 is colourless. The molecular structures of 6 and 7 have been determined from single crystal X‐ray diffraction data. Compound 6 crystallises in bimolecular aggregates, in which there is a weak η‐C6 … Sn contact.
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