Palladium(II) and platinum(II) tetrakisthiourea dichloride bis(7-hydroxy-5-methyl[1,2,4]triazolo[1,5a]pyrimidine) dihydrate solvates

The title compounds palladium(II) and platinum(II) tetrakisthiourea dichloride bis(7-hydroxy-5-methyl[1,2,4]triazolo[1,5a]pyrimidine (Hmtpo)) dihydrate solvates, have been synthesized by reacting the cis-[MCl(2)(Hmtpo)(2)] (where M = Pt(II), Pd(II)) complexes with an excess of thiourea (tu) and the structure of the palladium compound was solved by X-ray diffraction. Crystals of [Pd(tu)(4)]Cl-2 . 2Hmtpo . 2H(2)O are triclinic with space group <(P)over bar 1> and unit cell dimensions a = 7.972(1), b = 9.049(1), c = 11.808(2)Angstrom, alpha = 88.20(1), beta = 75.15(1), gamma = 76.54(1)degrees. The cation [Pd(tu)(4)](2+) is centrosymmetric involving four sulfur thiourea atoms in a near square planar environment. The triazolopyrimidine molecules, chloride anions and water molecules do not take part in the metal center coordination but interact by hydrogen bonding between them and the thiourea moieties. A comparison between powder diffraction data of palladium(II) and platinum(II) compounds clearly indicates that both compounds are isomorphous.