Following is an increasing trend of β o values; open isomer-spiropyran 1 (4876.61 au) > open isomer-spiropyran 2 (3578.72 au) > close isomer-spiropyran 2 (2844.07 au) > close isomer-spiropyran 1 (1242.20 au).
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Role of Delocalization, Asymmetric Distribution of π-Electrons and Elongated Conjugation System for Enhancement of NLO Response of Open Form of Spiropyran-Based Thermochromes.
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