Electronic absorption spectra of selenophene analogs of chalcones

Abstract

The electronic absorption spectra of 21 1-(selenienyl-2)-3-arylpropen-1-ones and -3-ones are measured in hexane and ethanol solution. It is found that the 2-selenienyl group in such compounds is more bathochromic and electron-donating than 2-furyl and 2-thienyl. The effects of electron-donating and-accepting substituents onλmax of a longwave band are considered. It is shown that Hammett'sσ can be connected with shift in absorption frequency when electron-donating substituents are introduced into the aromatic ring of 1-(selenienyl-2)-3-phenylpropen-1-one. The synthesis of three new selenophene analogs of chalcones is described.