Description

UNIT-I: ELECTRONIC SPECTROSCOPY

Introduction: Nature and interaction of electromagnetic radiation with matter, types of molecular spectra, selection rules, characteristic features for absorption or emission of electromagnetic radiation, band width, factors contributing to the band width, Doppler broadening, intensity of spectral lines and transition probability, factors influencing positions and intensity of spectral lines, energy dissipation from excited states. Electronic Spectroscopy:

Energy levels, molecular orbitals, theory of electronic spectroscopy, Frank-Condon principle, transition probability, types of transitions, types of absorption bands, solvent effect on electronic transitions, electronic spectra of polyatomic molecules, chromophore and auxochrome, Woodward-Fischer rules for calculating absorption maximum, calculation of absorption maximum in conjugated dienes, trienes, polyenes, poly-ynes, eneynes, alpha, beta- unsaturated carbonyl compounds, benzene and substituted benzenes, other aromatic hydrocarbons, heterocyclic systems. Stereochemical factors in electronic spectroscopy – biphenyls and binaphthyls, cis- and trans-isomers. Angular distortion and cross-conjugation,  steric inhibition of resonance. Instrumentation for electronic spectroscopy. Electronic spectroscopy Notes for Class 12th, BSc & MSc