Future Trends and Scope on Liquid Crystal-Induced Circular Dichroism

4 Future Trends and Scope on Liquid Crystal-Induced Circular Dichroism 

Norden et al. have examined the CD spectral changes of dyes oriented in a liquid crystal matrix, on variing the order parameter q, which is estimated by NMR observation 262). Kuball et al. presented a theoretical description of the optical activity of oriented molecules, and they found that the C D of the transition A of a given oriented molecule Ae (v) is described by  

This equation gives an estimation of the direction of the transition moment. Again, it should be noted that the CD of an anisotropic system can be falsified by interference with the effects of linear birefringence and linear dichroism. One should have in mind that the linear birefringent or linear dichroism contributions are three orders of magnitude larger than that of the intrinsic CD. 

The needs to observe the CD of samples having ordered structures such as mitochondria and viruses will increase in the future. Much attention should be paid to CD observations of samples in which optically active molecules are aligned to each other and are concentrated in the ordered systems. 

In these cases, a variation of the distance between the sample and the detector, in which the variation of the detector acceptance angle is also examined, provides an easier diagnosis on the distortion of the CD resulting from the linear birefringence, linear dichroism, and light-scattering effects. 

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