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Phase-Matching Second-Harmonic Generation in Zero-Dimensional Zinc Thiocyanates Ligated with Chiral Amino Acids
Qinglan Zhong1, Gangji Yi1, Juan Cheng1
1College of Chemistry, Sichuan University, Chengdu 610064, China.
Abstract:
Two organic-inorganic hybrid solids, namely, Zn(SCN)2(L-C9H11NO2)2 (1) and Zn4(SCN)4(L-C5H8NO3)4(H2O)4 (2), were synthesized by incorporating chiral amino acids into the zinc thiocyanate system. Compound 1 crystallizes as a monomeric complex in the noncentrosymmetric space group P21, while compound 2 features a circular tetrameric structure crystallized in the noncentrosymmetric space group P21212. Both compounds exhibit phase-matching second-harmonic generation (SHG) responses, which are 1.4 and 3.1 times that of KH2PO4, respectively. Theoretical calculations were conducted to determine the source of their SHG responses.
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