New Thiolated Nitrophenylhydrazone Crystals for Nonlinear Optics

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• 作者：Ji-Youn Seo ; Seung-Heon Lee ; Mojca Jazbinsek ; Hoseop Yun ; Jong-Taek Kim ; Yoon Sup Lee ; In-Hyung Baek ; Fabian Rotermund ; O-Pil Kwon
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：January 1, 2012
• 年：2012
• 卷：12
• 期：1
• 页码：313-319
• 全文大小：390K
• 年卷期：v.12,no.1(January 1, 2012)
• ISSN：1528-7505

文摘

We investigate new 4-nitophenylhydrazone crystals with thiolated electron donors for nonlinear optical applications. The methylthiolated (SM) electron donor and the biphenyl sulfane (SB) electron donor, which promotes a herringbone packing motif, are incorporated with an acentric nonlinear optical core, nitrophenylhydrazone (NPH), which promotes a 位-shaped packing motif in the crystalline state. SM-NPH (4-(methylthio)benzaldehyde-4-nitrophenylhydrazone) crystals show head-to-tail hydrogen-bonded chains, which outweigh the usual 位-shaped packing of the nitrophenylhydrazone group. SB-NPH crystals (4-(phenylthio)benzaldehyde-4-nitrophenylhydrazone) showsimultaneous 位-shaped packing, based on the hydrogen bonds of nitrophenylhydrazone with the nitro electron acceptor group, and the herringbone-shaped packing of biphenyl sulfane groups. Polar SM-NPH chains pack in a centrosymmetric crystal structure, while SB-NPH crystals exhibit a large macroscopic second-order nonlinearity resulting from an acentric molecular ordering of two rotational isomers. In addition, SB-NPH crystals undergo an irreversible phase transition before melting, with the second phase being also acentric with a strong second harmonic generation efficiency.