PHYSICO-CHEMICAL STUDIES ON THE INTERACTION OF ANILS WITH INORGANIC GE.S & SOME LEWIS ACIDS

Abstract

Investigations on the class of compounds known as anils have been carried out mainly from the synthetic view point. Here too the studies have been limited to beniylidene aniline and its derivatives end vary little has been attempted at to synthesise and characterise new anils like those obtained from glyoxala and aromatic amines. Apart from this little Information la available on certain very Interesting and Important physico-chemical aspects, vix., their role as chelating agents,their use as colorimetric reagents, their adsorption and even possible interaction (due to bathochromlc effect) with gels etc. The only work worth quoting In this direction is that of Krohnke and Gross on bathochromlc effect in p-dimethyl amino anil of phenyl glyoxal as observed by complex formation and adsorption. The scanty knowledge about anils, especially about their physico-chemical behaviour, aa described above, pointed towards the necessity and Importance of undertaking systema tic atudies on these compounds. T©*> begin with, the following aspects, which go to form the main theme of the thesis, were Investigated i- (i) P- naphthaeylldene aniline,^-naphthaeylldene - p-toluldene, f> -naphthaeylldene- p- chloroanlline, /3- naphthaeylldene - m- nitroanlline,/3-naphthaeylldene - p- nttroanlline,/3-naphthaeylldene, o<- naphthyl amine. P - naphthaeylldene »P- naphthyl amine, p-dimethyl amino anil of P> - naphthyl glyoxal, p - dimethyl amino anil of f> - naphthyl glyoxal nitrile, p-dimethyl amino anil of methyl glyoxal anils, not synthesised so far were prepared and characterised by obtaining their derivatives and I.R. spectra. (il) The peculiar and Interesting property of the above anils (as well as the previously synthesised anil, p-dimethyl amino anil of phenyl glyoxal) to undergo chela tion with metals not particularly belonging to transition elements was studied in detail and the composition and structure of the complexes so obtained was investigated using methods of chemical analysis, visible spectrophoto metry and I.R, spectroscopy. The metsi salts chosen for these studies were the Lewis acids, (ill) Adsorption of the anils In various non-polar solvents on Inorganic gels including silica was studied and the nature of adsorption Isotherm critically examined, (lv) The behaviour of the non-aqueous solutions of some metal chelatea of anils on the silica surface waa studied to establish the relationship between pore availa bility and adsorption or surface reactions. (v) The Appendix gives a few data on the magnetic susceptibility of the anils and Its mercury, sine and cadmium complexes to establish the phenomenon of partial charge transfer in these anils, rendering the ligand paramag* netic Insplte of the lone pair of electrons associated with their structural formulae.