Formation of long-lived “colored” spiroantrooxazine isomers incorporated into fluoroplast F-42 matrix in a supercritical carbon dioxide medium

Abstract

It has been demonstrated that formation of isomeric “colored” merocyanine forms B and Bx of indoline spiroantrooxazine (SAO) introduced into Fluoroplast F-42 matrix from supercritical carbon dioxide (SC-CO2) depends on the volume concentration of toluene in the medium, which plays a role of an aromatic electron donor cosolvent. It also has been shown that observed dependencies of changes in the content of introduced photochrome forms, forming in the Fluoroplast F-42 matrix, can be described by a scheme which reflects the redistribution kinetics of SAO molecules between the medium (SC-CO2) and the polymer. In this case, the “blue” form B is formed by SAO molecules solvated by toluene, which localize at specific fragments of the matrix and form triple SAO/F-42/toluene complexes. The “Red” form Bx is formed under the coordination of desolvated SAO molecules, which transfer into the matrix from the SC-CO2 medium, near F-42 matrix fragments.