Abstract
A new family of luminescent platinum(II) acetylide complexes and polymers 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 monoterminal acetylide ligands provided metal complexes trans-[Pt(p-tolyl3P)2(C≡C-R)2] (R=C6H4-p-NO2 (1) C6H4 -p-CH3 (2)), and equimolar amounts of diterminal ligand and metal chloride precursor, under reflux, afforded the metal poly-yne polymers [-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 (1H, 31P, 13C) and mass spectrometry, as well as elemental analysis. The molecular structure of the metal complex trans-[Pt(p-tolyl3P)2(C≡CC6H4–p-NO2)2] (1) was confirmed by single crystal X-ray crystallography. The electronic absorption and photoluminescence spectra of the metal complexes and polymers have been used to probe their photophysical properties. The studies reveal that the presence of heavy metal atom and substituent groups on 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.
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Acknowledgments
Financial support from Shahjalal University of Science and Technology, Sylhet, Bangladesh is gratefully acknowledged. We also thank the National Natural Science Foundation of China (Project Number 51373145), Hong Kong Baptist University (FRG2/12-13/083), Hong Kong Research Grants Council (HKBU203312 and HKUST2/CRF/10), Areas of Excellence Scheme, University Grants Committee of HKSAR (Project No. AoE/P-03/08), Natural Science Foundation of Hubei Province of China (2013CFA087) and Hubei Province High-End Talent Training Program. The work was also supported by Partner State Key Laboratory of Environmental and Biological Analysis and Strategic Development Fund of HKBU. Y. H. Lo gratefully acknowledges the financial support from the National Science Council of Taiwan (NSC 102-2113-M-845-001) and the project of the specific research fields in the University of Taipei, Taiwan. H. Li thanks the 111 Project and Beijing Engineering Research Center of Food Environment and Public Health from Minzu University of China (No. B08044 and No.10301-01404026) for financial support.
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This paper is dedicated to the memory of Prof. Eberhard Neuse, a friend, colleague and dedicated contributor to the science of inorganic and organometallic polymers of biological significance.
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Sina, A.A.I., Al-Rafia, S.M.I., Ahmad, M.F. et al. Synthesis, Structures and Properties of Novel Platinum(II) Acetylide Complexes and Polymers with Tri(tolyl)phosphine as the Auxiliary Ligand. J Inorg Organomet Polym 25, 427–436 (2015). https://doi.org/10.1007/s10904-014-0071-7
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DOI: https://doi.org/10.1007/s10904-014-0071-7