Organic–inorganic hybrid material as zwitterion: Synthesis and structure of terminal ammonium ions-containing organosilyl species supported on mono-lacunary Dawson polyoxometalate

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• 作者：Takeshi Hasegawa ; Yuhki Kasahara ; Shoko Yoshida ; Takayuki Kurashina ; Shotaro Aoki ; Kenji Yoza ; Kenji Nomiya
• 关键词：Organic– ; inorganic hybrid ; Dawson polyoxometalate ; Organosilyl group ; Free and bound ammonium cations ; Zwitterion
• 刊名：Inorganic Chemistry Communications
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：10
• 期：12
• 页码：1416-1419
• 全文大小：444 K

文摘

The title compound 1 with a formula of (Bu₄N)₄[α₂-P₂W₁₇O₆₁{Me₃N⁺(CH₂)₃Si}₂O] · CH₃CN was obtained in 77.1 % (4.21 g scale) yield by a 1:2 molar-ratio reaction of the mono-lacunary Dawson polyoxometalate (POM) [P₂W₁₇O₆₁]¹⁰⁻ with N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride ([Me₃N(CH₂)₃Si(OMe)₃]Cl) in mixed water/acetonitrile solution under acidic conditions and unequivocally characterized with complete elemental analysis, thermogravimetric and differential thermal analyses (TG/DTA), FTIR, solution (³¹P, ¹H, ¹³C and ²⁹Si) NMR and X-ray crystallography. Compound 1 contained two types of the ammonium cations, i.e., the counterions Bu₄N⁺ (free cations) and the terminal quaternary ammonium ions (bound cations) which are connected to the POM through the organosilyl groups.