オリゴフェニレンビニレンアンテナを有する光捕集性デンドリマーの振動解析と超高速なエネルギー伝達

概要

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From analyses of molecular vibrations, we have studied rapid energy transfer (ET) process in a series of star-shaped stilbenoid phthalocyanine (SSSnPc;n=1,2) dendrimers having π-conjugated light harvesting (LH) antennas. In SSSnPc, the aromatic rings of the antenna are connected to core by π-conjugated vinylene subgroups, and highly efficient ET occurs through a π-conjugation network between the core and the LH antenna. However, different temperature dependencies of the ET efficiencies βET were found between SSS1Pc and SSS2Pc. To form the π-conjugated network for rapid ET in SSSnPc, a high co-planarity between the planes of the LH antennas and the core is necessary. However, both of a steric hindrance and torsional vibration in the antenna subunits are expected to affect seriously this co-planarity. On our investigation, the steric hindrance and the torsional vibration modes were analyzed in both of SSS1Pc and SSS2Pc by semi-empirical molecular orbital calculations. In addition, we have evaluated amplitude of the torsional vibrations depending on temperature.
2010-03-00