Synthesis, spectral, SHG efficiency and computational studies of some newly synthesized unsymmetrical azines of 4-biphenylcarboxaldehyde.

Research paper by R R Arulmani, K R KR Sankaran

Indexed on: 24 Apr '14Published on: 24 Apr '14Published in: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy


A series of novel unsymmetrical azines 2-8 are prepared and characterized by FT-IR, (1)H, (13)C NMR, Mass and UV spectral studies. The Gaussian-03 B3LYP/6-311+G(d,p) calculations on these azines are used to evaluate the heat of formation of the different conformers, identify the stable conformation, to determine dipole moment (μ), polarizability (α0), first hyperpolarizability (βtot), selected geometrical parameters, MEP surface, frontier molecular orbital energies (HOMO-LUMO) and their energy gap. The μ, α0, βtot values clearly depict that the unsymmetrical azine 8 is found to have a good NLO property compared to other azines 1-7. The SHG measurement of unsymmetrical azine 8 was performed by Kurtz and Perry powder method and the results indicated that the azine 8 is having comparable efficiency as that of potassium dihydrogen phosphate (KDP) crystal. The natural bond orbital (NBO) analysis of the unsymmetrical azines 2-8 are also made using B3LYP/6-31G(d,p) basis set.