Langmuir-Schaefer films based on cyclotriphosphazene-substituted phthalocyanines: Supramolecular organization, UV/Vis study, and laser-induced nonlinear absorption

Low-defective thin films of 2-hydroxy-9(10),16(17),23(24)-tri-tert-butylphthalocyanine (1), as well as its cyclotriphosphazene-substituted derivatives, monomer (2) and clamshell-like dimer (3), have been obtained and extensively studied. It is shown that these dyes produce stable floating layers with a certain number of threedimensional aggregates at the air/water interface. The floating layers retain their structure when transferred to a glass substrate by the Langmuir-Schaefer method, demonstrating the H-aggregation of the dyes. In contrast to the initial monohydroxyphthalocyanine 1, thin films of its derivatives, cyclotriphosphazene-substituted monomer 2 and dimer 3, show a slight increase in absorption when the number of deposited layers exceeds 100. It is shown that thin films of the studied dyes 1-3 can be used in the technology of optical limitation of laser radiation, demonstrating a good cutting efficiency of dangerous nanosecond pulses.

Automated summary

Low-defective thin films of 2-hydroxy-9(10),16(17),23(24)-tri-tert-butylphthalocyanine (1) and its derivatives, monomer (2) and dimer (3), exhibit stable floating layers with three-dimensional aggregates at the air/water interface. These layers preserve their structure when transferred to a glass substrate and demonstrate H-aggregation. The thin films of these dyes can be used for optical limitation of laser radiation, showing efficient cutting of dangerous nanosecond pulses.