25 October 2002 Synthesis, structure, and crystal growth of new potential NLO materials
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Several very stable imine derivatives were synthesized by the reaction of aromatic aldehydes with diaminomaleonitrile. These compounds include different donor groups connected to the acceptor by conjugated chains of different lengths. Another group of compounds that have been synthesized is chiral pyrrolidine derivatives with varying acceptor substituents. After crystallization, products were characterized by X-ray analysis and other physical methods. Most of these materials crystallize in noncentrosymmetric space groups that define their second harmonic generation. The molecules have almost planar structures, that is favorable for the strong conjugation between donor and acceptor fragments, and take part in the formation of intermolecular hydrogen bonds. Quantum calculations of molecular electronic properties (dipole moments, hyperpolarizabilities of first and second order) have been completed.
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Volodymyr N. Nesterov, Volodymyr N. Nesterov, Genevieve Kuhn, Genevieve Kuhn, Tatiana V. Timofeeva, Tatiana V. Timofeeva, Vladimir N. Nesterov, Vladimir N. Nesterov, Ronald D. Clark, Ronald D. Clark, Mikhail Yu. Antipin, Mikhail Yu. Antipin, } "Synthesis, structure, and crystal growth of new potential NLO materials", Proc. SPIE 4813, Crystal Materials for Nonlinear Optical Devices and Microgravity Science, (25 October 2002); doi: 10.1117/12.452399; https://doi.org/10.1117/12.452399

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