Synthesis, Photochromism and Crystal Structure of 1-(2-Cyano-1,5-dimethyl-4-pyrryl)-2-2-methyl-5-(3-pyridyl)-3-thienyl perfluorocyclopentene

摘要

A new family of photochromic diarylethene compounds,1-(2-cyano-1,5-dimethyl-4-pyrryl)-2-[2-methyl-5-(3-pyridyl)-3-thienyl]perfluorocyclopentene(1o)having an unsymmetrical pyrryl and thienyl substituted hexafluorocyclopentene unit,was synthesized and its structure was determined by X-ray analysis.The crystal belongs to triclinic system,space group P1 with a=8.897(7),b=10.139(8),c=12.361(9),α=85.222(7),β=75.439(7),γ=78.736(8)o,Z=2,V=1057.8(14)3,Dc=1.468 mg/m3,μ=0.220 mm-1,F(000)=476,the final R=0.0608 and wR=0.1754 for 3199 observed reflections(I>2(I)).Interestingly,compound 1 exhibits good photochromic properties with alternate irradiation of UV light and visible light(>510 nm)to form two photoisomers in hexane solution and crystal phase.