Monoclinic modification of aquadi-n-butyl-bis-(pyrazine-2-carboxyl-ato-κN,O)tin(IV).

The asymmetric unit of the title organotin(IV) compound, [Sn(C(4)H(9))(2)(C(5)H(3)N(2)O(2))(2)(H(2)O)], contains one-and-a-half mol-ecules. The half-mol-ecule is completed by crystallographic twofold symmetry, with its Sn and water O atoms lying on the rotation axis. Both mol-ecules feature seven-coordinate Sn atoms in trans-C(2)SnN(2)O(3) penta-gonal-bipyramidal coordination environments. The carboxyl-ate anions N,O-chelate to the Sn atom. In the crystal, the carboxyl-ate O atoms not involved in coordination serve as acceptors for O-H⋯O hydrogen bonds from adjacent water mol-ecules, generating a three-dimensional network.