Photochromism in monolayers

Abstract
The photochromic properties of 1′‐octadecyl‐3′,3′‐dimethyl‐6‐nitrospiro[2H‐1‐benzopyran‐2,2′‐indoline] have been studied in monolayers at the air‐water interface by measuring the surface pressure‐area isotherms and the surface potential of several mixtures of this compound with tripalmitine. By using the Langmuir‐Blodgett technique we have transferred mixed monolayers of tripalmitine and spiropyran in a molar mixing ratio of 6:1 onto glass slides and have studied their photochromic properties in monolayer assemblies.