Octabutyl-1κ2C,2κ2C,3κ2C,4κ2C-bis-μ3-oxo-1:2:3κ3O;1:3:4κ3O-tetrakis-[μ-(2-pyridinecarboxylato N-oxide)]-1κ2O,O′:2κO;2κO:3κ2O,O′;3κ2O,O′:4κO;1κ2O,O′:4κO-tetratin hydrate

The unit cell of the title compound, bis[1,1,3,3-tetrabutyl-1,3-bis(picolinato N-oxide)distannoxane] hydrate, [Sn-4(O)(2)(C4H9)(8) (C6H4NO3)(4)]. H2O, contains two independent centrosymmetric dicarboxylatotetraorganodistannoxane dimers, one of which is hydrogen bonded to two water molecules. Both dimers possess a planar Sn2O2 core unit, the O atoms of which are covalently bonded to two [dibutyl(picolinato N-oxide)tin] units. The endocyclic Sn atoms (of the Sn2O2 core units) are six-coordinate in C2SnO4 skew-trapezoidal bipyramidal environments whereas the exocyclic Sn atoms (of the [dibutyl(picolinalo N-oxide)tin] units) are seven-coordinate in trans-C2SnO5 pentagonal bipyramidal environments.