Application of response surface methodology for exploring beta-cyclodextrin effects on the decoloration of spiropyran complexes

摘要

Response surface method is applied here to trace the photochromic path and explore the substituent and beta-cyclodextrin effects on the decoloration of the spiropyran/beta-cyclodextrin polymer (SP/CDP) complex. Calculations support the ultraviolet/visible experimental results, suggesting that introducing an electron-withdrawing group to the benzopyryl moiety of SPs favors an enhancement in their decoloration, whereas replacing the benzopyryl with a naphthopyryl moiety obstructs their decoloration. CDP complexation weakens the C-1-O bond of the closed SP form and enhances the polar zwitterionic structure in the open photomerocynine form. However, the electron-withdrawing group strengthens the interaction of benzopyryl SPs with CDP, thereby hindering their decoloration. (C) 2016 Elsevier B.V. All rights reserved.