N→Sn-Coordinated Stannaoxidoborates Containing a SnB4O6 Unit

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• 作者：Barbora Mairychová ; I. V. Kityk ; Artur Maciag ; Filip Bureš ; Milan Klikar ; Aleš Růžička ; Libor Dostál ; Roman Jambor
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：February 15, 2016
• 年：2016
• 卷：55
• 期：4
• 页码：1587-1594
• 全文大小：520K
• ISSN：1520-510X

文摘

We report here the synthesis of new N→Sn-coordinated stannaoxidoborates H[LSnB₄O₆R₄] {L = [2,6-(Me₂NCH₂)C₆H₃]⁻ and R = Ph (6), 4-Br-Ph (7), 3,5-(CF₃)₂-Ph (8), and 4-CHO-Ph (9)} containing a nonsymmetric SnB₄O₆ unit. Compounds 6–9 represent new derivatives of the pentaborates [B₅O₆R₄]⁻ in which the central boron is substituted by a tin atom. Compounds 6–9 were characterized by means of elemental analysis, electrospray ionization mass spectrometry, and NMR spectroscopy and in the case of 6–8 also by single-crystal X-ray diffraction analysis. The structures of N→Sn-coordinated stannaoxidoborates 6–8 consist of a spirobicyclic arrangement, with two six-membered SnB₂O₃ rings at the tin atom providing the new stannaoxidoborate [LSnB₄O₆R₄]⁻ motif, which is compensated for by the proton atom coordinated to the Me₂N group of the ligand L. The linear and thermal properties of 6–9 were studied with the help of electronic absorption spectra and differential scanning calorimetry. In addition, the presence of the nonsymmetric stannaoxidoborate SnB₄O₆ unit in 6, 7, and 9 prompted us to investigate their second-order nonlinear-optical properties.