Reactions of K2PtCl4 with pyridine derivatives in dimethylformamide and synthesis of potassium trichloro(pyridine)platinum(II)

Abstract

The reactions of K2PtCl4 with pyridine derivatives L (L = py = pyridine, pic = picoline, and lut = lutidine) were studied in dimethylformamide (DMF).[Formula: see text]The complexes (1) were isolated and the yield decreased with the order, 2,4-lut = 2-pic > 2,6-lut > 4-pic = py, which can be correlated to the steric hindrance of the ortho methyl groups. The compounds (2) can be converted to the compounds (3), the free ligand acting as catalyst and (3) is the final product of the above reactions. The compounds (3) can also be obtained from a DMF solution of [Pt(L)4]Cl2 (L = py) at room temperature. A comparison of the above reactions in water and in DMF was also made.