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We find that the amount of J-aggregates forming through light-induced J-aggregation in mixed LB films of SP1822 and matrix molecules depends on the spatial arrangement of the matrix with respect to SP1822. In mixed Langmuir films of SP1822 and arachidic acid (H19A), each component has a constant occupied area on water irrespective of mixing ratio. H19A is positioned beside SP1822, allowing for the J-aggregation of MC1822 (merocyanine form of SP1822). In mixed Langmuir films of SP1822 and octadecylamine (ODA), area per SP1822 is almost constant at mixing ratios of 1:0, 1:1 and 1:2. ODA is positioned on top of the hydrophilic moiety of SP1822 and should have strong intermolecular interaction with SP1822, hindering the J-aggregation of MC1822.

Structures and Photoreactions of the LB Films of Amphiphilic Spiropyran Mixed with Amphiphilic Matrices