Selective photocyclic aromatization (SCAT) of cis–cisoid helical poly(phenylacetylene) derivatives was investigated during the in situ photodegradation in a film. An infrared absorption peak appeared at ∼1700 cm⁻¹ owing to the overtone vibration of the 1,3,5-trisubstituted benzene and the peak at 1060 cm⁻¹ due to the cis C=C bending of the main chain decreased, indicating occurrence of SCAT. Simultaneously, the polymer film became emissive in visible region during SCAT. The fluorescence (FL) quantum efficiency was approximately 0.92% in the film and not so much high relative to usual fluorophores. The FL emission disappeared in an instant when the decomposition product dissolved in a solvent. The FL lifetime of the polymer film increased with photodegradation. These all indicated the occurrence of excimer emission. A finely resolved FL image pattern was readily obtained using a photomask.

在薄膜的原位光降解过程中，研究了顺式-顺式螺旋聚苯乙炔衍生物的选择性光环芳构化（SCAT）。由于1,3,5-三取代苯的泛音振动，在〜1700 cm ^-1处出现了红外吸收峰，而在1060 cm ^-1处出现了红外吸收峰。由于主链的顺式C = C弯曲减少，表明发生了SCAT。同时，在SCAT期间，聚合物膜在可见光区域发射。薄膜中的荧光（FL）量子效率约为0.92％，相对于通常的荧光团而言并不是很高。当分解产物溶解在溶剂中时，FL发射消失。聚合物膜的FL寿命随光降解而增加。这些都表明准分子发射的发生。使用光掩模容易获得精细分辨的FL图像图案。