Donor-acceptor pyran-2-ones: Absorption and fluorescence spectra of 4-substituted 2H-1-benzoapthopyran-2-ones

摘要

The absorption spectra and emission spectra of 4-substituted 2H-1-benzoapthopyran-2-ones 3a-I have been determined in THF and DMSO. The substituent at the 4-position of the 2H-benzoapthopyran-2-one, establishes a compact conjugation pathway in which the pyran-2-one nucleus can act as an acceptor ring.