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Isomerization of Na‐Centered Alkyltin Keggin Clusters
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-11-09 , DOI: 10.1002/ejic.202000880 Danielle C. Hutchison 1 , Rachelle M. Smith 1 , May Nyman 1
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-11-09 , DOI: 10.1002/ejic.202000880 Danielle C. Hutchison 1 , Rachelle M. Smith 1 , May Nyman 1
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The Keggin cluster topology, discovered in tungsten polyoxometalates approximately a century ago, is now broadly represented across the periodic table. The alkyltin Keggin clusters are unique in that it is the only Keggin family that appears to favor the rarer β and γ rotational isomers, co‐crystallized as β,γ‐[(BuSn)12(NaO4)(OCH3)12(O)5(OH)7] (β,γ‐NaSn12). Nuclear Magnetic Resonance Spectroscopy (NMR; 1H, 119Sn) studies show lability and ready exchange between hydroxy‐methoxy ligands, accelerated by residual water in polar solvents. Room temperature and heated solutions of β,γ‐NaSn12 show five distinct 23Na NMR peaks, corresponding to all five of the Keggin rotational isomers simultaneously in solution. This is the only example of coexistence of all Keggin isomers simultaneously, providing more in‐depth insight into parameters influencing Keggin isomer stabilization, isolation, and exchange.
中文翻译：
Na中心烷基锡Keggin团簇的异构化
约一个世纪前在多金属钨酸钨中发现的Keggin簇拓扑结构现在在元素周期表中得到了广泛的代表。烷基锡Keggin团簇的独特之处在于，它是唯一似乎偏爱稀有的β和γ旋转异构体的Keggin家族，共结晶为β，γ-[（BuSn）12（NaO 4）（OCH 3）12（O ）5（OH）7 ]（β，γ-NASN 12）。核磁共振波谱（NMR; 1 H，119 Sn）研究表明，羟基-甲氧基配体之间的不稳定性和易于交换，并由极性溶剂中的残留水加速。室温和β的加热溶液，γ-NASN 12峰显示五个不同的23 Na NMR峰，分别对应于溶液中所有五个Keggin旋转异构体。这是所有Keggin异构体同时共存的唯一示例，可更深入地了解影响Keggin异构体稳定，分离和交换的参数。
更新日期：2021-01-05
中文翻译：
Na中心烷基锡Keggin团簇的异构化
约一个世纪前在多金属钨酸钨中发现的Keggin簇拓扑结构现在在元素周期表中得到了广泛的代表。烷基锡Keggin团簇的独特之处在于，它是唯一似乎偏爱稀有的β和γ旋转异构体的Keggin家族，共结晶为β，γ-[（BuSn）12（NaO 4）（OCH 3）12（O ）5（OH）7 ]（β，γ-NASN 12）。核磁共振波谱（NMR; 1 H，119 Sn）研究表明，羟基-甲氧基配体之间的不稳定性和易于交换，并由极性溶剂中的残留水加速。室温和β的加热溶液，γ-NASN 12峰显示五个不同的23 Na NMR峰，分别对应于溶液中所有五个Keggin旋转异构体。这是所有Keggin异构体同时共存的唯一示例，可更深入地了解影响Keggin异构体稳定，分离和交换的参数。
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