Acta Cryst. (2002). E58, m466-m468  [ doi:10.1107/S1600536802013600 ]

Tetrabutylbis(N-phthaloylphenylalaninato)distannoxane dimer

K. Hans, M. Parvez, M. Ashfaq, S. Anwar, A. Badshah and A. Majeed

Abstract: The crystal structure of the title compound, [Sn₄(C₄H₉)₈(C₁₇H₁₂NO₄)₄O₂], is composed of centrosymmetric dimers lying about inversion centers. Its central Sn₂O₂ core is fused, with two four-membered (Sn₂O₂) and two six-membered (Sn₂O₃C) rings, incorporating O and C atoms of N-phthaloylphenylalaninate ligands that show different modes of coordination with tin. The endocyclic Sn atoms of the Sn₂O₂ core are six-coordinate in a skew-trapezoidal bipyramidal environment, while the exocyclic Sn atoms are essentially five-coordinate and exhibit distorted trigonal-bipyramidal geometry. The Sn-C distances lie in a narrow range 2.117  (3)-2.137  (5)  Å [mean 2.128  (7)  Å]. The endocyclic Sn-O distances in the Sn₂O₂ core are 2.057  (3) and 2.157  (3)  Å, while the exocyclic Sn-O distances [2.277  (3) and 2.725  (3)  Å] indicate a strong and a relatively weak SnO interaction. The Sn-O distances involving the exocyclic Sn atom are in the range 2.031  (3)-2.232  (3)  Å.

Online 9 August 2002

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