期刊
CRYSTAL GROWTH & DESIGN
卷 8, 期 11, 页码 4021-4025出版社
AMER CHEMICAL SOC
DOI: 10.1021/cg800218u
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资金
- Swiss National Science Foundation
- Ajou University
- Korea Foundation for International Cooperation of Science & Technology (KICOS) through a grant provided by the Korean Ministry of Science & Technology (MOST) [2007-00440]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [2007-00440] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A series of new organic nonlinear optical nitrophenylhydrazone crystals based on pyrrole with various substituents (X: -H, -CH3, -CF3) on the hydrazone group (-CX = N-NH-) has been synthesized and their polymorphs have been investigated. The chromophore 2-((2-(4-nitrophenyl)hydrazono)methyl)-1H-pyrrole (HNPH) exhibits two polymorphs with large macroscopic nonlinearity, with a powder second harmonic generation activity of 420 times and 210 times that of urea at 1.9 mu m for the anisotropic polar HNPH-I with P-n space group and the isotropic nonpolar HNPH-II polymorph with P2(1)2(1)2(1) space group, respectively. The microscopic and macroscopic nonlinearities in the crystallographic system have been analyzed theoretically using finite field calculations.
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