![Sample our Bioscience journals, sign in here to start your access, Latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5925/TOC-Subject-Sample-2021-Bioscience.jpg"})
Abstract
The interaction vector model1-3 (IVM) has been used to calculate on a very simple basis, and a good accuracy, the intensity of the secondary transition of the benzene chromophore of more than 80 molecules. In this paper we shall study the phthalic anhydride chromophore. Such a molecule is interesting in the frame of the IVM, since it displays a five membered ring, fused to the benzene ring, which imposes to that benzene ring a strong strain and a classical conjugation. No previous molecule displaying these two joined effects, which could cancel their respective influence on intensity, has been studied. The phthalic anhydride molecule will allow to study these effects and test the IVM in such a case. Furthermore, the whole molecules which have been studied till now display only π donating substituents. So, before studying the phthalic anhydride molecule, it is necessary to determine the values of the IVM parameters necessary for that study; that is to say: to study the behaviour of π withdrawing substituents such as -CO2R.
Notes
American Petroleum Institute, Research Project 44. Spectra 102, 103