Received 6 August 2009
In the title tetranuclear tin(IV) complex, [Sn4(CH3)8(C20H22N2O4)Cl2O2], there are three completely different tin-atom coordinations. One metal atom (site symmetry 2) adopts a distorted pentagonal-bipyramidal SnC2N2O3 coordination arising from the N,N',O,O'-tetradentate deprotonated Schiff base, two methyl groups in the axial sites and a 3-O atom that also bonds to two further Sn atoms. Two symmetry-equivalent Sn atoms adopt very distorted SnC2O4 arrangements that could be described as pentagonal-bipyramidal with one equatorial vertex missing and the C atoms in the axial site. The final Sn atom (site symmetry 2) adopts an SnC2Cl2O trigonal-bipyramidal arrangement, with Cl atoms in the axial sites. As well as the two Sn atoms, one O atom lies on a twofold rotation rotation axis, and another is disordered about the axis. The terminal ethoxy group is disordered over two sets of sites with equal occupancy.
For other organotin derivatives of 6,6'-dialkoxy-2,2'-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenol, see: Cunningham et al. (2004). For the crystal structure of 6,6'-diethoxy-2,2'-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenol, see: Bermejo et al. (2007).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); 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, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5035 ).
We thank the University of Malaya (RG020/09AFR) for supporting this study.
Barbour, L. J. (2001). J. Supramol. Chem. 1, 189-191.
Bermejo, M. R., Fernández, M. I., Gómez-Fórneas, E., González-Noya, A., Maneiro, M., Pedrido, R. & Rodríguez, M. J. (2007). Eur. J. Inorg. Chem. pp. 3789-3797.
Bruker (2008). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Cunningham, D., Gilligan, K., Hannon, M., Kelly, C., McArdle, P. & O'Malley, A. (2004). Organometallics, 23, 984-994.
Flack, H. D. (1983). Acta Cryst. A39, 876-881.
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Westrip, S. P. (2009). publCIF. In preparation.