The synthesis, NMR ( 1 H, 13 C, 119 Sn) and IR spectral studies of some di‐ and tri‐organotin(IV) sulfonates: X‐ray crystal structure of [( n ‐C 4 H 9 ) 2 Sn(OSO 2 C 6 H 4 CH 3 ‐4) 2 ·2 H 2 O]

Abstract A number of alkyltin(IV) paratoluenesulfonates, R n Sn(OSO 2 C 6 H 4 CH 3 ‐4) 4− n ( n = 2, 3; R = C 2 H 5 , n ‐C 3 H 7 , n ‐C 4 H 9 ), have been prepared and IR spectra and solution NMR ( 1 H, 13 C, 119 Sn) are reported for these compounds, including ( n ‐C 4 H 9 ) 2 Sn(OSO 2 X) 2 ( X = CH 3 and CF 3 ), the NMR spectra of which have not been reported previously. From the chemical shift δ( 119 Sn) and the coupling constants 1 J ( 13 C, 119 Sn) and 2 J ( 1 H, 119 Sn), the coordination of the tin atom and the geometry of its coordination sphere in solutions of these compounds is suggested. IR spectra of the compounds are very similar to that observed for the paratoluenesulfonate anion in its sodium salt. The studies indicate that diorganotin(IV) paratoluenesulfonates, and the previously reported compounds ( n ‐C 4 H 9 ) 2 Sn(OSO 2 X) 2 ( X = CH 3 and CF 3 ), contain bridging SO 3 X groups that yield polymeric structures with hexacoordination around tin and contain non‐linear CSnC bonds. In triorganotin(IV) sulfonates, pentacoordination for tin with a planar SnC 3 skeleton and bidentate bridging paratoluenesulfonate anionic groups are suggested by IR and NMR spectral studies. The X‐ray structure shows [( n ‐C 4 H 9 ) 2 Sn(OSO 2 C 6 H 4 CH 3 ‐4) 2 ·2H 2 O] to be monomeric containing six‐coordinate tin and crystallizes from methanol–chloroform in monoclinic space group C 2/ c . The SnO (paratoluenesulfonate) bond distance (2.26(2) Å) is indicative of a relatively high degree of ionic character in the metal–anion bonds. Copyright © 2003 John Wiley & Sons, Ltd.