Received 5 May 2011
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).
Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SI2355 ).
We thank the University of Malaya (grant No. RG020/09AFR) for supporting this study.
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