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イギリスの王立化学会発行の学術雑誌 Dalton Transactions
2022年6月号 Front Coverに選ばれました。
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東京大学
大学院総合文化研究科
内田さやか先生
大学院総合文化研究科
内田さやか先生
Journal
Dalton Transactions
07 June 2022, Issue 21 Link
07 June 2022, Issue 21 Link
Basicity of isostructural porous ionic crystals composed of Nb/Ta-substituted Keggin-type polyoxotungstates
Zhewei Weng, Naoki Ogiwara, Daisuke Yokogawa, Takashi Kitao, Yuji Kikukawa and Sayaka Uchida
Three isostructural porous ionic crystals (PICs) based on Keggin-type POMs with different compositions but equal negative charge ([BW12O40]5− (BW12), [SiW11NbO40]5− (SiW11Nb), and [SiW11TaO40]5− (SiW11Ta)) are synthesized. Experimental and theoretical characterizations of the three PICs (1_BW12, 1_SiW11Nb, and 1_SiW11Ta) show that the substitution of Nb/Ta for W in the POMs enhances the basicity of PICs, which increases in the order of 1_BW12 < 1_SiW11Nb < 1_SiW11Ta. These findings clearly show that the increase in basicity is due not only to the increase in negative charge of the POM molecule as is often explained, but also to the character of the substituted element itself.
Link
Zhewei Weng, Naoki Ogiwara, Daisuke Yokogawa, Takashi Kitao, Yuji Kikukawa and Sayaka Uchida
Three isostructural porous ionic crystals (PICs) based on Keggin-type POMs with different compositions but equal negative charge ([BW12O40]5− (BW12), [SiW11NbO40]5− (SiW11Nb), and [SiW11TaO40]5− (SiW11Ta)) are synthesized. Experimental and theoretical characterizations of the three PICs (1_BW12, 1_SiW11Nb, and 1_SiW11Ta) show that the substitution of Nb/Ta for W in the POMs enhances the basicity of PICs, which increases in the order of 1_BW12 < 1_SiW11Nb < 1_SiW11Ta. These findings clearly show that the increase in basicity is due not only to the increase in negative charge of the POM molecule as is often explained, but also to the character of the substituted element itself.
Link
