Related Experiment Video
Updated: Apr 14, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Ketocyanine dyes: impact of conjugation length on optical absorption and third-order polarizabilities
Kada Yesudas1, Eluvathingal D Jemmis, Kotamarthi Bhanuprakash
1School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram - 695 016, India. yesudas.kada@gmail.com.
Abstract:
Broken symmetry and symmetry adapted cluster-configuration interaction techniques help to understand the structure-property relationships like impact of conjugation length on the electronic structure, small energy optical absorption and third-order polarizabilities in symmetric ketocyanine dyes. The sum-over-states approximation truncated to essential states model helped to understand the origin of the negative sign and the most relevant components of average static third-order polarizabilities. The results can be used as a design principle to model the ketocyanine dyes which can absorb in the visible to near-infrared region and show large negative third-order nonlinear activity.
Related Concept Videos
¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
UV–Vis Spectroscopy of Conjugated Systems
One of the factors influencing λmax is...
IR Absorption Frequency: Delocalization
In IR...
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
Cycloaddition Reactions: MO Requirements for Photochemical Activation

