Dichloro(1,5-cyclooctadiene)platinum(II) can be conveniently synthesized via the procedure from Holst et al.[1]
Procedure: In air, a 100mL round-bottom flask was charged with a magnetic stir bar, potassium tetrachloroplatinate (1.00g, 2.4mmol), water (20mL), glacial acetic acid (25mL), and 1,5-cyclooctadiene (0.88g, 8.0mmol). The reaction mixture was then heated to 90degC for 1h under vigorous stirring, and cooled back to room temperature. Solvent was concentrated to ca. half the volume, and the white precipitate filtered under suction. Product was washed with water (2x30mL), ethanol (30mL), and diethyl ether (50mL). Product was then collected and placed under high vacuum for 1h at 100degC. Product was collected as a white, crystalline solid (0.90g, 2.4mmol, 90%).
Notes:
- Potassium tetrachloroplatinate should be dissolved in the volume of water to be used in the reaction and filtered beforehand to remove traces of metallic platinum.
- Potassium tetrachloroplatinate was purchased from Pressure Chemicals, which sells it for under $50 USD per gram. Other vendors will charge far more for it. Beware.
- Ensure thorough drying of the product under high vacuum to remove all traces of water, acetic acid, and ethanol.
[1] van Holst, M.; Le Pevelen, D.; Aldrich-Wright, J. Eur. J. Inorg. Chem. 2008, 29, 4608-4615.