Proceedings of the Indian Academy of Sciences - Chemical Sciences

The proton affinities, gas phase basicities and adiabatic ionization energies and electron affinities of some important hydroxylamines and alkanolamines were calculated using B3LYP, CBS-Q and G4MP2 methods. Also, the B3LYP method was used to calculate vertical ionization energies and electron affinities of the molecules. The calculated ionization energies are in the range of 8-10.5 eV and they decrease as the number of carbon atoms increases. Computational results and ion mobility spectrometry study confirm that some alkanolamines lose a water molecule due to protonation at oxygen site and form cationic cyclic compounds. Effect of different substitutions on the cyclization of ethanolamine was studied theoretically.

In this paper, the linear isometry of the sequence space l(pv) into itself is specified as the automorphism of l(pv) onto itself, when (pv) satisfies the conditions, (i) 0 < pv⩽ 1, (ii) 1 +d ⩽ pv ⩽ p < ∞,q < qv < 1+d/d,d > o When (pv) satisfies condition (ii),l (pv) andl (qv) are proved to be perfect spaces in the sense of Kothe and Toeplitz. A similar result connecting linear isometry and automorphism has been noted in the case of a non-normable complete linear metric space whose conjugate space is also determined.

Starting from γ-resorcylic aldehyde some typical 5-hydroxy and methoxy flavylium salts have been prepared and studied. They exhibit negligible fluorescence even in concentrated sulphuric acid. The structural factors that affect fluorescence in flavylium salts are discussed and comparison effected with coumarins.