The electronic absorption spectra of three groups of furan derivatives: 2-formyl, 2- acetylfuran, and 2-furoic acid, N-(2-furylmethylene) amines and phenylfurans were investigated. The predominant conformation as well as the polarity of the molecule could be predicted from its spectrum. The investigated molecules were proved to be “all planar” configuration which led to substantial interaction between the electronic states of the ...
