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The laser Raman spectra of the hydroxo-bridged platinum(II) complexes, di-μ-hydroxo-bis(diammine) platinum(II)-nitrate [(NH3)2Pt(OH)2Pt(NH3)2](NO3)2, and isotopic derivatives involving the atoms H/D and 16O/18O are recorded in the solid state in the range 0–4000 cm−1. The infrared spectra of the complexes are recorded in KBr pellets in the range 200–4000 cm−1. Assignments of the different lines for the nitrate ion, the ammonia molecules, the hydroxo groups, and the square planar skeleton vibrations of the complex and its isotopic analogs are given.