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The effective utilization of light from light sources is an important factor in photochemical reactions in both basic and practical aspects. With the aim of improving the efficiency, greater molar absorption coefficient of chromophores is advantageous as well as higher quantum efficiency, because total efficiency depends on the both. Conventional i-line (366 nm) from mercury lamps is a useful light in practical photochemical reactions. Thioxanthone moiety is one of good sensitizers that have strong absorption in this region of light. [ 1 ] However, the solubility of thioxanthone derivatives in organic solvents or polymer matrixes are poor in general. In order to overcome this problem, introduction of these groups into side-chain has been often applied. [2-41 We have already reported that pendant acyloxyimino (AOl) groups are transformed into primary amino groups on irradiation as shown in Scheme 1.[5,6] Triplet sensitizers such as aromatic ketones were very effective for the phototransformation.[7,8] Furthermore, it was found that irradiated films became insoluble in THE after post-exposure bake (PEB) treatment.[9] In this communication, we report preparation; photo-reactivity, and solubility change after PEB of copolymers bearing both AOI and sensitizing groups including thioxanthone moiety.

Effective Utilization of 366nm-Light in Photo-Generation of Pendant Amino Groups Using Pendant Thioxanthone Groups.