Di-μ-chloro-bis[(η³-2-methylallyl)platinum] reacts with chiral imines, p-R¹C₆H₄CHNC₆H₄OR²-p [HL*; with R¹, R², or both equal to either (R)- or (S)-1-methylheptyl], to yield the C,N-cyclometallated platinum(II) compounds [Pt₂(μ-Cl)₂(L*)₂] (2). Treatment of 2 with Tl[(p-H₂₁C₁₀OC₆H₄CO)₂CH] produces mononuclear orthoplatinated complexes (3) incorporating a β-diketonate. Both complexes 2 and 3 are mesomorphic materials that display smectic A (SmA) and chiral smectic C (SmC*) phases. Their mesogenic properties are compared with those of their palladium analogues, reported previously. The platinum complexes show somewhat more stable mesophases. A study of the ferroelectric properties of compounds 2 and 3 has been performed.