Degree Name

Bachelor of Science (Hons.)


Department of Chemistry


Titrations of solutions of vanaxiyl sulphate have heen carried out with aqueous solutions of: (a) polyhydroxy alcohols, (b) phenols, (c) sodium salts of mono- and di-hasic carboxylic acids, and (d) sodium salts of aliphatic and aromatic carboxylic acids® Of the titrants used, the following group gave initial falls in pH values: (a) 0rth0""dih.ydr0x.y benzenes, (b) sodium salts of aliphatic carboxylic acids which have B-hydroxyl groups, (c) sodium salts of aromatic acids with both a hydroxyl group and a benzene ring(s) on the ^-carbon (to the carboxyl group). The above results and the variation in the volume of titrant required to attain the minimum pH value are explained. Using complexing agents selected on the basis of the anomalous results obtained, twelve vanadyl (iv) complexes, with hydroxy carboxylic acids, the sodium salts of some of them and ortho-hidroxy benzenes were prepared and investigated. The behaviour of these complexes, their magnetic and spectroscopic properties, and their measured molecular weights and pK values have been correlated with structures proposed for four of them. The structures of these four crystalline complexes, prepared by using new solvent systems, are currently being investigated by X-ray diffraction methods.