Coming soon
Spectral Techniques in Organic Chemistry
Course Objectives:
This course will enable the students to –
-
identify the instrumentation involved in the various spectroscopic techniques.
-
apply the key concepts of spectroscopy in the elucidation, characterization and inference of the relevant structural information of various known organic molecules and to make them extend the same to unknown organic compounds.
Course Outcomes (COs):
|
Course |
Learning outcomes (at course level) |
Learning and teaching strategies |
Assessment Strategies |
|
|
Paper Code |
Paper Title |
|||
|
CHY-612 |
Spectral Techniques in Organic Chemistry |
Learners will be able to- CO160: identify and analyze different molecules based on selection rules and fundamental theory of spectroscopy CO161: differentiate between compounds of different electronic, structural and functional constitution in 13C-NMR using the basic theoretical knowledge of techniques like COSY and NOSEY CO162: interpret and distinguish between the structures of simple compounds using the Mass, IR and NMR spectral data. CO163: calculate the λmax for different organic compounds using Woodward-Feiser rules. |
|
|
General principles : Different regions of electromagnetic radiation, quantisation of energy, regions of the spectrum. 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.
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; Overtones, Fermi resonance , Applications in functional group analysis.
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.
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: COSY, NOESY NMR spectra), Structural determination of simple organic compounds using UV, IR &1H NMR spectral data.
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.
- Spectrometric Identification of Organic Compounds, Eighth Edition; R.M. Silverstein, F.X. Webster, David J.Kiemie and David L. Bryce; John Wiley and Sons, Inc., Singapore, 2014.
- Applications of Spectroscopy; Third Edition; William Kemp; Palgrave Publisher Ltd., New York, 2004.
- Stereochemistry: Conformation and Mechanism; Tenth Edition; P.S. Kalsi; New Age International Publishers Pvt Ltd, New Delhi, 2019.
