Vibrational spectra and structure of some trivinyltin carboxylates

Crystal structure of trichloroacetatotrivinyltin and Mössbauer spectroscopic characterization of trivinyl- and divinyl-n-butyltin carboxylates

“…Trivinyltin trichloroacetate is also distorted away from D3h geometry towards C g V , as can be seen from the fact that angle e3 < 53.1" and el and e2 > 53.1". However, Czv symmetry is approximately maintained in the Sn-O(1)-0(2I)-C (7) The extent of asymmetry (as measured by the difference between the two Sn-0 distances1*9 and departure from planarity of the SnC, group) also follows the same sequence, i.e. methyl < vinyl < benzyl (Table 8).…”

“…Scattering factors for neutral non-hydrogen atoms were taken from Cromer and Waber,16 and that of Sn was corrected for the real and imaginary parts of the anomalous dis- 5) 1210( 7) 1634( 6) 1353(10) 3 448 (7) 4 055 (9) 3 351(8) 3 875 (9) 1 533 (7) TABLE 4 Selected interatomic distances (A) and angles (") with standard deviations in parentheses…”

“…123.4 (8) 1 26.1 ( 10) 1 28.2 ( 10) 118.9(8) 1 1 2.9 ( 10) 157.4(7) 122.8( 8) 112.9(8) 104.0(7) 110.5 (7) Atom positions derived by transformation of t h e asymmetric unit ( x , y, z) are defined by t h e superscript Roman numerals:…”

“…The equation of a plane in direct space is given by Px + Qy + Rz = S , where 1) consists of Sn(CH=CH,),(O,CCCl,) units linked by syn-anti trichloroacetate bridges, giving five-co-ordinate tin atoms in approximately D,h geometry. Chains are possible because the carboxyl group has the syn-anti conformation : the C(2)-O( 1)-Sn angle is 157.4" (7) while C(2)-0(2)-SnI1 is 122.8"(8) ; moreover, the Sn atom is out of the trichloroacetate plane by 0.35 A, while SnlI is out by 0.31 A (see Table 5).…”