The synthesis and electronic absorption spectra of 3-phenyl-3(4-pyrrolidino-2-substituted phenyl)-3H-naphtho[2,1-b]pyrans: further exploration of the ortho substituent effect |
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Authors: | Christopher D Gabbutt Alicia C Instone |
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Institution: | Department of Colour and Polymer Chemistry, The University of Leeds, Leeds LS2 9JT, UK |
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Abstract: | Introduction of a substituent into a sterically demanding 2-position of a 3-(4-pyrrolidinophenyl) ring of a 3,3-diaryl-3H-naphtho2,1-b]pyran results in the generation of an additional short wavelength absorption band leading to organic photochromes that appear as dull shades of orange and red. |
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Keywords: | Naphthopyrans Photochromism Steric effects Dual absorption bands Synthesis |
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