A new family of luminescent platinum acetylide complexes and polymer were formed by the Copper(I) catalyzed reaction of cis-[PtCl2(PR3)2] (R= C6H5-p-CH3) with appropriate acetylide ligands. The reaction of metal precursors with 2.5 equivalents of acetylide ligands provided metal complexes trans-[Pt(p-tolyl3P)2(C≡C-R)2] (R= C6H4 -p-CH3, C6H4-p-NO2), and equimolar amounts of ligand and metal precursor under refluxed condition provided metal poly-yne polymer [-Pt(p-tolyl3P)2C≡C-R-C≡C-]n , (R=biphenyl and 2,5-dioctyloxybenzene). Characterization of the newly developed polymer and metal complexes was accomplished by FT-IR, multinuclear NMR ( 1 H, 31 P, 13 C), and mass spectrometry as well as elemental analysis. The molecular structure of the metal complexes was confirmed by single crystal X-ray crystallography. The photophysical properties such as electronic absorption and photoluminescence spectra of the metal complexes and polymer have been investigated. The studies reveal that the presence of heavy metal atom and substituent groups in the phenyl ring of the ligands can enhance the efficiency of intersystem crossing from the S1 singlet excited state to the T1 triplet excited state and thus give intense phosphorescence. The polymer is found to be non-emissive both at room temperature and low temperature.
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