Platinum (Pt)-containing conjugated polymers were synthesized by the dehydrochlorination coupling polymerization of cis- and trans-dichlorobis­(N-(p-(diphenylphosphino)­benzoyl)-l-valine methyl ester)­platinum­(II) {cis-PtL 2Cl2 and trans-PtL 2Cl2, L = P­(Ph)2-p-C6H4CONHCH­[CH­(CH3)2]­CO2CH3} with 1,4-diethynylbenzene, aiming at obtaining polymers with controlled geometry at the Pt centers. In the polymerization of cis-PtL 2Cl2, the geometry at the Pt centers was controlled by the amine used in the polymerization and the reaction temperature. The formed polymer with trans-Pt centers exhibited a circular dichroism signal at the main chain chromophore region in CH2Cl2/MeOH mixed solvent. Based on the crystal packing state and non-covalent interaction analysis of a model compound, the chiroptical activity is attributed to aggregation stabilized by intermolecular π–π, CH−π, and hydrogen-bonding interactions between the phosphine ligands.

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