Date Published: June 01, 2011
Publisher: International Union of Crystallography
Author(s): Kong Mun Lo, Seik Weng Ng.
The SnIV atom in the title carboxylate-bridged polymer, [Sn(C7H7)3(C9H7O2)]n, exists in a trans-C3SnO2 trigonal–bipyramidal geometry (average covalent Sn—O = 2.167 Å, average dative Sn—O = 2.361 Å and average O—Sn—O = 169.6°). The polymer propagates as a helical chain along the b axis with a repeat distance that is half the b-axial length. There are four independent formula units in the asymmetric unit; two are disposed about a false center of inversion with respect to the other two so that the space group emulates a centric space group.
Trialkyltin(IV) carboxylates generally contain five-coordinate Sn atoms and are carboxylate-bridged polymers; see: Ng et al. (1988 ▶). For the structure of tribenzyltin acetate, see: Ferguson et al. (1995 ▶). For the structure of tribenzyltin p-nitrocinnamate, see: Thong et al. (2008 ▶). For the use of the Hooft and Flack parameters in confirming the P21 space-group description, see: Hooft et al. (2008 ▶); Spek (2009 ▶). The polar P21 space group is sometimes assigned incorrectly, see: Clemente & Marzotto (2003 ▶, 2004 ▶).