論文雑誌「Nanoscale」のカバーピクチャーを制作しました[東京大学]

弊社で制作しました東京大学 内田さやか先生のカバーアートが
イギリスの王立化学会発行の学術雑誌 Nanoscale 2021年11月号 Front Coverに選ばれました。

カバーピクチャー 科学イラスト 論文表紙絵 アートアクション 東京大学 内田さやか先生
Client
東京大学
大学院総合文化研究科 
内田さやか先生
Journal
Nanoscale
28 November 2021,  Issue 44 Link
Incorporating highly basic polyoxometalate anions comprising Nb or Ta into nanoscale reaction fields of porous ionic crystals
Zhewei Weng, Naoki Ogiwara, Takashi Kitao, Yuji Kikukawa, Yu Gao, Likai Yan and Sayaka Uchida

Polyoxometalates (POMs) are oxide cluster anions composed of high-valence early transition metals and are widely used as catalysts. Yet base catalysis of POMs remains an ongoing challenge; group V (V, Nb, and Ta) elements form more negatively charged POMs than group VI (Mo and W) elements, and in particular, polyoxoniobates and polyoxotantalates are known to show strong basicity in solution due to the highly negative surface oxygen atoms. Herein, we report for the first time porous ionic crystals (PICs) comprising Nb or Ta. The PICs are composed of Dawson-type Nb/W or Ta/W mixed-addenda POMs with oxo-centered trinuclear CrIII carboxylates and potassium ions as counter cations to control the crystal structure. Among the PICs, those with Nb or Ta tri-substituted POMs exhibit the highest yield (78–82%) and selectivity (99%) towards the Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate (353 K, 6 h), which is a typical base-catalyzed reaction, as reusable solid catalysts, and they can also catalyze the reaction of other active methylene compounds. A detailed investigation into the crystal structures together with DFT calculations and in situ IR spectroscopy with methanol as a basic probe molecule shows that the exposure of [Nb3O13] or [Ta3O13] units with highly negative surface oxygen atoms to the pore surface of PICs is crucial to the catalytic performance. These findings based on the composition–structure–function relationships show that Nb- and Ta-containing PICs can serve as platforms for rational designing of heterogeneous base catalysts.

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  • Nanoscale
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  • カバーピクチャー
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