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Hexasubstituted donor-acceptor benzenes as nonlinear optically active molecules with multiple charge-transfer
Boris Traber1, J Jens Wolff, Frank Rominger
1Organisch-Chemisches Institut der Ruprecht-Karls-Universität, Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 10, 2004
Summary
Three novel nonlinear optical (NLO) chromophores were synthesized and characterized. Compound 4b exhibits exceptionally high second-order polarizability, making it a promising material for NLO applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Photonics
Background:
- Nonlinear optical (NLO) materials are crucial for advanced photonic technologies.
- Developing chromophores with high NLO properties and controlled symmetry is an ongoing research area.
- Threefold symmetric molecules offer unique electronic and structural properties for NLO applications.
Purpose of the Study:
- To synthesize and characterize novel, threefold symmetric nonlinear optical (NLO) chromophores.
- To investigate the structure-property relationships of these synthesized NLO chromophores.
- To evaluate the second-order polarizability of the novel NLO chromophores.
Main Methods:
- Synthesis of chromophores 3, 13, and 4b using transition metal-catalyzed reactions (e.g., Co(2)(CO)(8), Rh(PPh(3))(3)Cl, Pd(0)).
- X-ray crystallography for structural elucidation of the synthesized compounds.
- Hyper-Rayleigh scattering (HRS) technique to measure second-order polarizability (beta).
Main Results:
- Successful synthesis of three novel NLO chromophores (3, 13, and 4b) with threefold symmetry.
- X-ray analysis confirmed structures and revealed distinct aryl ring twisting in 4b compared to 3 and 13.
- Compound 4b demonstrated a significantly large second-order polarizability (beta), among the highest for 2D nondipolar NLO chromophores.
Conclusions:
- The synthesized chromophores, particularly 4b, show excellent potential for NLO applications.
- Structural modifications, such as reduced aryl ring twisting, can enhance NLO properties.
- This work contributes to the design and synthesis of high-performance NLO materials.