Synthesis and Characterization of Sn(II) complexes supported by Amino Bis-Phenoxides ligands

The coordination behavior of a series of [Sn(OR)2] systems modified by substituted amine-bis(phenolate)ligands was investigated. The complexes were synthesised from the reaction of Sn[N(SiMe3)2]2 and the appropriate pro-ligand: N,N-bis(3,5-dimethyl-2-hydroxybenzyl)ethylamine (L1H2), N',N'-bis(2-hydroxy-3,5-dimethylbenzyl)-N,N-dimethylethylenediamine (L2H2), N,N'-bis(3,5-dimethyl-2-hydroxyphenylmethyl)-N,N'-dimethylethylenediamine (L3H2), 1,4-bis(2-hydroxy-3,5-dimethylbenzyl)-1,4-diazepane (L4H2), 2,2',4,4'-tetramethyl-6,6'-piperazine-1,4-diylbis(methylene)-bisphenol (L5H2) and N',N',N'',N''-tetrakis(2-hydroxy-3,5-dimethylbenzyl)-1,2-ethanediamine, and the products were identified as follows: [{L1}Sn]2 (1), [{L2}Sn] (2), [{L3}Sn] (3), [{L4}Sn], (4) and [{L6}Sn2]·(Py)2 (5). Reaction of complex (1) with O2 results in the formation of the Sn(IV) species [{L1}2Sn] (6), the molecular structure of which was also determined.