Nithyanandhan Jayaraj, Jayaraman Narayanaswamy, Davis Riju, Das Suresh
Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India.
Chemistry. 2004 Feb 6;10(3):689-98. doi: 10.1002/chem.200305297.
A series of azobenzene-functionalized poly(alkyl aryl ether) dendrimers have been synthesized and their photochemical and photophysical properties in solution and as thin films have been investigated. Although the photochemical behavior of the azodendrimers in solution indicated that the azobenzene units behave independently, very similar to the constituent monomer azobenzene unit, the properties of thin solid films of the dendrimers were distinctly different. The azodendrimers, AzoG1, AzoG2, and AzoG3 were observed to form stable supercooled glasses, which showed long-wavelength absorption and red emission characteristics of J-aggregates of the azobenzene chromophores. Reversible photoinduced isomerization of the azodendrimers in the glassy state is described.
一系列偶氮苯功能化的聚（烷基芳基醚）树枝状大分子已被合成，并对其在溶液中和作为薄膜时的光化学和光物理性质进行了研究。尽管偶氮树枝状大分子在溶液中的光化学行为表明偶氮苯单元表现独立，与组成单体偶氮苯单元非常相似，但树枝状大分子固体薄膜的性质却明显不同。观察到偶氮树枝状大分子AzoG1、AzoG2和AzoG3形成了稳定的过冷玻璃态，其显示出偶氮苯发色团J-聚集体的长波长吸收和红色发射特性。文中描述了玻璃态下偶氮树枝状大分子的可逆光诱导异构化。
