疏水作用对光化学和光物理过程的影响 Ⅻ.2-羟基-4-烷氧基二苯甲酮在不良溶剂中的簇集

HYDROPHOBIC EFFECTS ON PHOTOCHEMICAL AND PHOT-OPHYSICAL PROCESSES Ⅶ AGGREGATION OF 2-HYDROXY-4-ALKOXYBENZOPHENONE IN POOR SOLVENTS

测定了2-羟基-4-甲氧基二苯甲酮(HMDB)和2-羟基-4-辛氧基二苯甲酮(HODB)在良溶剂和不良溶剂中的吸收光谱。在不良溶剂(乙二醇-水的混合溶剂)中,带长链的HODB发生簇集。由于簇集体内极性较小,HODB的吸收光谱与其在环己烷中相似。HMDB不发生簇集。

The absorption spectra of 2-hydroxy-4-octoxybenzophenone (HODB) and 2-hydroxy-4-methoxybenzophenone (HMDB) both in good solvents (cyclohexane, tetrahydrofuran and methanol) and in poor solvents (ethylene glycol-water mixed solvents) were studied. In poor solvents, aggregation of HODB occurs. The absorption spectrum of HODB in aggregates is similar to that in cyclohexane, indicating that the polarity inside the aggregate is very low. This phenomenon was not observed for HMDB.