Platinum(II) and Platinum(IV) Bigunides

Chemistry Laboratories, Indian Institute of Technology; Kharagpur 72130-2, West Bengal.

Several robust complexes of platinum(II) and platinum(IV) with biguanide (C₂N₅H₇=BigH) having the composition [Pt(BigH₂)]X₂ and trans [Pt(OH)₂(BigH)₂X₂ have been synthesised by the interaction of chlorides of platinum(II) and (IV) with alkaline biguanide. Fusion of chloroplatinic acid with biguanide normal sulphate produced tris (biguanidinium)platinum(IV) sulphate from which the cis-dihydroxobis (biguandinium)platinuni(IV) hydroxide was isolated by treatment with concentrated alkali. The cis and trans varieties of [Pt(OH)₂(BigH)₂] (OH)₂ were characterised by the isolation of [Pten(BigH)₂](OH)2 from the cis variety of the compound.