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spectroscopy, IR Absorption Link Title :red_flag:, NMR
It is the study…
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IR Absorption Link Title :red_flag:
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principle of ir spectroscopy :red_flag:
when the energy difference between any pair of adjacent levels matches with the energy of ir radiation ,then the bonds in a molecule absorb the it radiation nad make transistions
Graphs
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alcohols hydrogen bonding :red_flag:
NMR
It is the study of molecular structure through the measurement of the interaction of radio waves with a collection of nuclei(matter) immersed in strong external magnetic field.
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INTERACTIONS
SPIN COUPLING
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splitting of a particular signal corresponding to same
type of protons (same chemical environment) is (2nI+1).
if there are different set of protons on both the carbons,
(2n1I+1)(2n2+1)
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chemical equivalency in proton- nmr
number of non equivalent set of protons in molecule leads to number of nmr signals
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[classification of electronic transistion] 
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UV spectroscopy
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Frank Condon principle :
An electronic transition takes place
so rapidly that the nuclei of a
vibrating molecule can be assumed to
be fixed during the transition
spin selection rule: the transitions that involve the promotion of electrons without a change in their spin is allowed transitions: Allowed transitions: singlet to singlet, triplet to triplet delta s=0
BEER-LAMBERT'S LAW:
The absorbance value during electronic transitions is directly proportional to
the concentration and the length of the sample
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UV
Vis spectrum is broad, why?
Due to many possible transitions, electronic transitions consists of the vast number of lines spaced so closely that the UV spectrometer cannot resolve them
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As conjugation increases, the energy gap between HOMO and LUMO levels
decreases
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Michaelson interferometer
Fourier transform (FT) IR
Fourier transformation (FT) is the transformation of the time domain
signal into the frequency (wavenumber) domain signal