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

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 (1)pi,pi* absorption bands below 410 nm and charge transfer transitions at 415-550 nm in CH2Cl2. 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 CH2Cl2 for ns laser pulses at 532 nm was demonstrated. (C) 2012 Elsevier B. V. All rights reserved.