Ring size control in diorganotin sulphides by intramolecular SnN coordination
摘要:
The synthesis of intramolecularly coordinated organotin sulphides, [(Me2NCH2CH2CH2)2SnS]n (1) and [Me2NCH2CH2CH2Sn(Ph)S]n (2), is described. Compounds 1 and 2 are dimers in chloroform solution (n = 2). Compound 1 forms a centrosymmetric dimer with a planar rectangular Sn2S2 four-membered ring in its centre. The tin atoms show a distorted trans-cis-cis octahedral coordination by 2C, 2N and 2S. The tin-nitrogen distances are 2.810(3) and 3.158(5) angstrom. Compound 1 can be regarded as a model substance for nucleophilic attack at penta-coordinate tin centres. Although the degree of intramolecular coordination of nitrogen to tin is temperature dependent, the four-membered Sn2Sn2 ring remains inert in solution. The existence of the asymmetric tin compound (Me2NCH2CH2CH2)2SnS2SnBut2 (1a) has been characterized in solution.
Ring size control in diorganotin sulphides by intramolecular SnN coordination
摘要:
The synthesis of intramolecularly coordinated organotin sulphides, [(Me2NCH2CH2CH2)2SnS]n (1) and [Me2NCH2CH2CH2Sn(Ph)S]n (2), is described. Compounds 1 and 2 are dimers in chloroform solution (n = 2). Compound 1 forms a centrosymmetric dimer with a planar rectangular Sn2S2 four-membered ring in its centre. The tin atoms show a distorted trans-cis-cis octahedral coordination by 2C, 2N and 2S. The tin-nitrogen distances are 2.810(3) and 3.158(5) angstrom. Compound 1 can be regarded as a model substance for nucleophilic attack at penta-coordinate tin centres. Although the degree of intramolecular coordination of nitrogen to tin is temperature dependent, the four-membered Sn2Sn2 ring remains inert in solution. The existence of the asymmetric tin compound (Me2NCH2CH2CH2)2SnS2SnBut2 (1a) has been characterized in solution.