Amorphous Polymers and Composites

The polyene chromophore (5.13), designed by Marder and utilised by Peyghambarian and co-workers, has specific features built into the structure that make it both an effective NLO chromophore for refractive index change and for it to 

Fused bridge prevents isomerisation and provides thermal and photochemical stability I------------------------------1 

Cyano groups give high stability and large dipole moment 

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