113161-05-0Relevant academic research and scientific papers
Square-pyramidal and trigonal-bipyramidal anionic (ethanedithiolato)stannates. Binuclear centers with tin-sulfur bonding
Holmes, Robert R.,Shafieezad, Sohelia,Holmes, Joan M.,Day, Roberta O.
, p. 1232 - 1237 (2008/10/08)
The first anionic five-coordinated tin compounds containing saturated rings were formed from the reaction of RSnCl3 and Et4N+Cl- with sodium ethane-1,2-dithiolate and from the partial hydrolysis of bis(ethane-1,2-dithiolato)tin in the presence of an amine base. The reactions yielded the new stannates, [(C2H4S2)2SnR][Et4N], where R = n-Bu (1) and Ph (2), and the new distannates [(C2H4S2)R(Cl)SnSCH2] 2[Et4N]2, where R = Me (3) and n-Bu (5), and [(C2H4S2)2SnSCH2] 2[BH]2, where B = Et3N (4) and Dabco (6). Mechanistic considerations suggest that binuclear tin structural representations similar to that found for 3 may enter as intermediates on the way to formation of the mononuclear representations, 1 and 2. X-ray analysis showed the geometry of 1 and 2 is best described in terms of distortions from a square or rectangular pyramid, while the geometry in 3 and 4 more closely approaches a trigonal bipyramid. The appearance of the square-pyramidal forms 1 and 2 possessing saturated bicyclic ring systems is indicative of the relative ease of distortion for five-coordinated tin compared to related silicon and arsenic compounds. Stannate 1 crystallizes in the orthorhombic space group Pbc21 with a = 12.132 (4) ?, b = 12.386 (4) ?, c = 15.344 (2) ?, and Z = 4. Stannate 2 crystallizes in the orthorhombic space group Aba2 with a = 12.932 (3) ?, b = 11.282 (3) ?, c = 15.577 (5) ?, and Z = 4. Distannate 3 crystallizes in the monoclinic space group P21/n with a = 8.436 (2) ?, b = 17.961 (5) ?, c = 13.004 (4) ?, β = 95.61 (2)°, and Z = 2. Distannate 4 crystallizes in the triclinic space group P1 with a = 8.638 (3) ?, b = 10.095 (3) ?, c = 12.538 (3) ?, α = 69.35 (2)°, β = 76.08 (2)°, γ = 69.40 (3)°, and Z = 1. The final conventional unweighted agreement factors were 0.036 (1), 0.040 (2), 0.036 (3), and 0.039 (4).
