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Tetraalkynyl calix[4]arenes with advanced NLO properties
Gunther Hennrich1, M Teresa Murillo, Pilar Prados
1Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain. gunther.hennrich@uam.es
Chemical Communications (Cambridge, England)
|May 27, 2005
Summary
Rigid, conjugated tetraalkynyl-calix[4]arenes were synthesized and showed enhanced nonlinear optical properties. Hyper-Rayleigh scattering confirmed improved second-order hyperpolarizability and conformational flexibility in solution.
Area of Science:
- Organic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Calix[4]arenes are versatile macrocyclic hosts with tunable properties.
- Highly conjugated organic molecules are of interest for nonlinear optics.
Purpose of the Study:
- To synthesize novel tetraalkynyl-calix[4]arenes with rigid, conjugated structures.
- To investigate the influence of conjugation on the second-order hyperpolarizability of calix[4]arenes.
- To perform conformational analysis of these molecules in solution.
Main Methods:
- Sonogashira cross-coupling reaction for synthesis.
- Hyper-Rayleigh scattering (HRS) for nonlinear optical measurements.
- X-ray crystallography for structural determination.
- Solution-state conformational analysis.
Main Results:
- Successful synthesis of rigid, highly conjugated tetraalkynyl-calix[4]arenes.
- Demonstrated significantly improved second-order hyperpolarizability (β) values compared to non-conjugated analogues.
- HRS provided insights into molecular hyperpolarizability.
- X-ray crystallography and solution studies revealed conformational flexibility.
Conclusions:
- Rigid conjugation in tetraalkynyl-calix[4]arenes enhances nonlinear optical properties.
- The synthesized compounds are promising candidates for optoelectronic applications.
- Hyper-Rayleigh scattering is a valuable tool for characterizing such materials.