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Spectral Techniques in Organic Chemistry
Paper Code:
CHY - 612
Credits:
3
Contact Hours:
45.00
Max. Marks:
100.00
9.00
Unit I:
Basic Elements of UV Spectroscopy
General principles Introduction to absorption and emission spectroscopy.
UV Spectroscopy: Types of electronic transitions, λmax, chromophores and auxochromes, bathochromic and hypsochromic shifts, intensity of absorption, application of Woodward Rules for calculation of λmax for the following systems: α,β unsaturated aldehydes, ketones, carboxylic acids and esters; Conjugated dienes: alicyclic, homoannular and heteroannular; Extended conjugated systems (aldehydes, ketones and dienes); Distinction between cis and trans isomers.
8.00
Unit II:
IR Spectroscopy
Fundamental and non-fundamental molecular vibrations; IR absorption positions of O, N and S containing functional groups; Effect of H- bonding, conjugation, effect of resonance and ring size on IR absorptions; Fingerprint region and its significance; Applications in functional group analysis.
10.00
Unit III:
NMR Spectroscopy
Basic principles of Proton Magnetic Resonance, chemical shift and factors influencing it; Spin – Spin coupling and coupling constant; Anisotropic effects in alkene, alkyne, aldehydes and aromatics; Interpretation of NMR spectra of simple compounds like ethyl acetate, ethyl alcohol, acetaldehyde, 1,2 dibromo ethane, ethyl bromide etc.
8.00
Unit IV:
13
13C NMR spectroscopy: general considerations, chemical shift, (aliphatic, olefinic, alkyne, aromatic, heteroaromatic & carbonyl carbon), proton (1H) coupled 13C NMR spectrum,off resonance(elementary idea of 2D NMR spectroscopy)
10.00
Unit V:
Mass Spectroscopy
Introduction, instrumentation, molecular ion-production, determination of molecular weight – molecular ion peak, base peak, nitrogen rule, isotope peak, metastable ions; fragmentation – basic fragmentation types and rules, factors influencing fragmentation, McLafferty rearrangement, fragmentation pattern of hydrocarbons, alcohols, ethers, ketones, aldehydes, carboxylic acids, amines, nitro compounds, alicyclic and heterocyclic compounds.
Combined applications of IR, UV, NMR and Mass spectral techniques for identification of simple organic molecules.
Essential Readings:
- Spectrometric Identification of Organic Compounds, Sixth Edition; R.M. Silverstein and F.X. Webster; John Wiley and Sons, Inc., Singapore, 1991.
- Applications of Spectroscopy; Third Edition; William Kemp; Palgrave Publisher Ltd., New York, 2004.
- Stereochemistry: Conformation and Mechanism; Fourth Edition; P.S. Kalsi; New Age International Publishers Pvt Ltd, New Delhi, 1999.
Academic Year:
