Structural, Optical, and Theoretical Studies of a Thermochromic Organic Crystal with Reversibly Variable Second Harmonic Generation

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• 作者：Michel Sliwa ; Arnaud Spangenberg ; Isabelle Malfant ; Pascal G. Lacroix ; Ré ; mi Mé ; tivier ; Robert B. Pansu ; Keitaro Nakatani
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：June 24, 2008
• 年：2008
• 卷：20
• 期：12
• 页码：4062 - 4068
• 全文大小：181K
• 年卷期：v.20,no.12(June 24, 2008)
• ISSN：1520-5002

文摘

N-(3,5-Ditert-butylsalicylidene)-2-aminopyridine (1) exhibits bulk second harmonic generation (SHG) activity (2 vs urea). X-ray diffraction measurements show a non-centrosymmetric structure (P3₂). Experimental data of polarization-dependent SHG match the theoretical calculations on the basis of the crystallographic data. 1 is also thermochromic in the crystalline state, and SHG at 120 K is 4 times as high as at room temperature. Comparison is made with the isostructural isomer, N-(3,5-ditert-butylsalicylidene)-4-aminopyridine (2), which exhibits reversible photoinduced SHG variations.