935853-60-4Relevant academic research and scientific papers
Modulated conjugation as a means of improving the intrinsic hyperpolarizability
Perez-Moreno, Javier,Zhao, Yuxia,Clays, Koen,Kuzyk, Mark G.,Shen, Yuquan,et al.
body text, p. 5084 - 5093 (2009/09/30)
A new strategy for optimizing the first hyperpolarizability based on theconcept of a modulated conjugated path in linear molecules is investiga ted. A series of seven novel chromophores with different types of conjugated paths were synthesized and characterized. Hyper-Rayleigh scatteringexperiments confirmed that modulated conjugation paths that include ben zene, thiophene, and/or thiazole rings in combination with azo and/or ethenyl linkages between dihydroxyethylamino donor groups and various acceptor groups result in enhanced intrinsic hyperpolarizabilities that exceed the long-standing apparent limit for two of the chromophores. The experimental results are analyzed and interpreted in the context of quantumlimits, which show that conjugation modulation of the bridge in donor/a cceptor molecules simultaneously optimizes the transition moments and the energy-level spacing.
