|Fig. 1 Shifts in absorption position and intensity|
It is an affected by which absorption maxima is shifted towards the longer wavelength.In this type of shift intensity remain constant & wavelength is increses due to which it is also known as red shift.
It is an effect in which the absorption maxima is shifted towards the shorter wavelength can be done by decresing the conjucation. Thus these type of the shift is known as Blue shift .
It is an effect in which the intensity of the absorption is an increases while wavelength is constant.
It is an effect in which the absorption is decreases while wavelength remain constant.
Nitro compounds are generally yellow in color, so it is clear
For example:- ethylene, acetylene, etc.
i.e:- Π- Π* and n- Π*.
An auxochrome can be defined as any group which does not itself act as chromophrous whose presence bring about a shift of absorption bent towards the red ends of the spectrum.
The absorption of longer wavelength is due to the combination of chromphrous and a auxochroms to which rise new chromophrous.
Auxochrome + Chromphrous = New chromophrous
For Example:- −OH− , −OR−, −NH2−, −NHR−, −NR2−, −SH−, etc.
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