H. Hartung, André Krug, F. Richter
1994
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0
Influential Citations
2
Citations
Journal
Main Group Metal Chemistry
Abstract
The structure of tetraisopropyl 2-(alkyl-dihalostannyl)ethane 1,1-diphosphonates R(Br)(X)SnCH2CH-[P(0)(0Pr)J]2 (1: R = Me, X = CI; 2: R = Me, X = Br; 3: R = Bu, X = Br) has been investigated in solution and in case of 3 also in the solid state. 3 crystallizes in the monoclinic space group Pljn (a = 11.909(1), b = 16.089(2), c = 15.473(2) A; ß = 104.395 (9)°; V = 2871.6 (6) A; Ζ = 4; R = 0.063). In the solid state 3 is dimeric as result of intermolecular interaction of one phosphonyl group with a tin atom of a neighboring molecule. The other phosphonyl group in 3 is intramolecularly coordinated to the tin. As shown by Sn, P, and 'H NMR spectroscopy in nonpolar solvents 1 3 exhibit a temperature and concentration dependent monomer-dimer equilibrium.