A new square-planar palladium complex salt hydrate, (C9H12NO)2[PdCl4]·0.5H2O, has been characterized. The asymmetric unit of the complex salt comprises two [PdCl4]2− dianions, four 2-hydroxy-2,3-dihydro-1H-inden-1-aminium cations, each derived from (1R,2S)-(+)-1-aminoindan-2-ol, and one water molecule of crystallization. In the crystal, a two-dimensional layer parallel to (001) features a number of O—H...O, N—H...O, O—H...Cl and N—H...Cl hydrogen bonds.
