A series of meso-substituted phenyl porphyrin derivatives were selected for investigating their photochromic
behavior in several aryl chloride solutions. After ultraviolet irradiation (UVI, λ = 360 nm), the solutions’ color changed
rapidly and sensitively from pink to bright green; and their pink color can be recovered gradually when the green samples
are radiated under visible light (VR, λ > 500 nm) or placed around diffused light at ambient conditions. Notably this photochromic
behavior can be completely stimulated by a halochromic method. A porphyrin H2TMPP 3 was selected as a
typical sample for revealing this chromic mechanism, and molecular configuration for the green porphyrin chromophores
was proposed based on crystal assembly of H2TPP 1. Finally the sensitive molecular recognition of H2TMPP 3 towards
hydrochlorides was examined.
Keywords: Halochromism, molecular recognition, photochromism, ultraviolet irradiation, visible radiation.
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