Abstract
The solvent effect on photochromism and solvatochromism of the SP (1′-ethyl-3′, 3′-dimethyl-6-nitrospiro [chromene-2, 2′-indoline]) is investigated in details. The photochromic phenomena indicate that the change of solvents can reverse the thermodynamic equilibrium between the ring-close Spiropyran and ring-open Merocyanine. Therefore, a more appropriate definition is suggested to emphasize the thermodynamic nature of the positive and negative photochromism; furthermore, a generalized definition of chromism is raised as a reference. Hansen solubility parameter is originally employed to analyze the roles of different intermolecular interactions in the solvatochromism of SP in diverse solvents. The kinetics of spiropyran in nonpolar solvents exhibits stepwise first order of reaction that does not follow the regular situation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
