Synthesis and photophysics of platinum(II) complexes bearing 2-(7-(4-R-phenylethynyl)-9, 9-dihexadecyl-fluoren-2-yl)-1, 10-phenanthroline ligand

摘要

A series of platinum(II) complexes bearing 2-(7-(4-R-phenylethynyl)-9, 9-dihexadecyl-fluoren-2-yl)-1, 10-phenanthroline ligand were synthesized and characterized. Their photophysical properties were systematically investigated by UV-Vis absorption, emission, and transient absorption spectroscopy. All complexes exhibit ~1π, π? absorption bands below 410 nm and charge transfer transitions at 415-550 nm in CH_2Cl_2. They all emit at ca. 624 nm with vibronic structures. Both UV-Vis absorption and emission spectra show negative solvatochromic effect. All complexes exhibit broad and moderately strong triplet transient absorption from the near-UV to the near-IR spectral region. Reverse saturable absorption of these complexes in CH_2Cl_2 for ns laser pulses at 532 nm was demonstrated.