Bis(l-leucinium) hexa-chlorido-stannate(IV) dihydrate.

The title compound, (CHNO)[SnCl]·2HO, features l-leucinium cations adopting extended conformations, which maximizes the separation between the methyl groups [-CH(CH)] and the polar NH and COOH moieties. Additionally, an intra-molecular hydrogen bond between the ammonium (NH ) group and the carboxyl group induces a slight reduction in the C-C-N bond angles, with an average value of 106.5°, compared to the ideal tetra-hedral angle of 109.5°. The NH group is nearly coplanar with the C-C-C-C carbon chain in both fragments, whereas the carboxyl (COOH) group and the methyl group at the C5 position deviate significantly from this plane. The octa-hedral complex anion is close to regular. In the crystal, an extensive network of hydrogen bonds links the components into a three-dimensional network.