高压对三明治结构的双[2,3,9,10,16,17,23,24-八-(对甲氧基苯氧基)]酞菁铕光谱行为的影响

High Pressure Effect on Spectroscopy Properties of Sandwich-like Europium Bis[2,3,9,10,16,17,23,24-octakis(4-methoxyphenoxy)phthalocyninato]

本工作对具有三明治结构的双 [2 ,3 ,9,10 ,16,17,2 3 ,2 4 八 (对甲氧基苯氧基 ) ]酞菁铕在不同压力下的光谱行为进行了研究 .结果表明 ,压力对配合物的Q带吸收具有明显的调制作用 ,随着压力的增加 ,对应Q带吸收的LUMO和SUMO能级降低 .由于LUMO和SUMO (SecondUnoccupiedMolecularOrbit)能级的降低 ,使得Soret带吸收后到达的高能级与LUMO和SUMO能级间隔增加 ,减慢了从高能级的无辐射过程 .随着压力的增加 ,对应于Soret带吸收的荧光强度 (4 10nm)大大增强 .

Spectroscopic properties of a sandwich-like metal phthalocynine, europium bis[2,3,9,10,16,17,23,24-octakis(4-methoxyphenoxy)phthalocyninato], have been studied at different pressures. The pressure tuning effect has been observed in the absorption of the Q band for the complex. With increase of pressure, the LUMO and SUMO(Second Unoccupied Molecular Orbit) of the complex are stabilized to lower level. It increases the energy gap between the LUMO (or SUMO) and the higher energy level, which corresponds to the absorption of the Soret band of the complex. This enhancement of the energy gap slows down the radiationless internal conversion of the electron that has been excited to the higher energy level by the Soret absorption. Thus obvious increase of the emission by the Soret absorption has been observed with increase of pressure.