Abstract:

Three meso-tetrakis(4-n-acyloxylphenyl) porphyrins and their platinum(Ⅱ) complexes were synthesized. The structures of the compounds and photophysical properties were characterized by ¹H NMR, MS, UV-Vis and photoluminescence(PL) spectroscopies. Differential scanning calorimetry(DSC) and polarizing microscope were used to probe liquid properties of the complexes. Strong triplet emission peaks at around 660 nm were observed with phosphorescence quantum efficiencies(0.183～0.211) in THF solution and triplet lifetime (8.86～13.52 μs) in degassed CH2Cl2 solution. The results show that the attached acyloxy of the long carbon chains at the meso-positions of tetrakis(4-hydroxylphenyl) porphyrin can reduce phosphorescent lifetime and aggregation between molecules. Further, these complexes reveal characteristic of liquid crystal for long carbon chain acyloxy at the meso-positions of porphyrin complexes. It is possible that these new complexes can be used as applicable phosphorescent emitters in organic light emitter devices(OLEDs) and polarized luminescent devices.

Key words: meso-tetrakis(n-acyloxylphenyl) porphyrin complex, phosphorescence, synthesis, liquid crystal