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Bisphosphonate-modified boat-shaped polyoxoniobates for efficient catalysis of knoevenagel condensation

IF 3.2 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR
Journal of Solid State Chemistry Pub Date : 2025-03-07 DOI:10.1016/j.jssc.2025.125304
Xue-Yu Zhang, Yan-Ru Li, Li-Hao Hong, Ping-Xin Wu, Yu-Chen Cong, Ying-Hao Mi, Yan-Qiong Sun, Shou-Tian Zheng, Xin-Xiong Li
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Abstract

Three novel inorganic-organic hybrid polyoxoniobates (PONbs), H27K2Na6(H2O)17[K(H2O)(Nb6O19)2(Nb6O20)(RA)2]·13H2O (1, H5RA = C7H11NO7P2, risedronic acid), H21(CN3H6)12[K3(H2O)(Nb6O19)2(Nb6O20)(ZA)2]·5H2O (2, H5ZA = C5H10N2O7P2, zoledronic acid, CN3H6 = guanidine) and H24(CN3H6)7K2(H2O)4[K3(H2O)2(Nb6O19)2(Nb6O20)(EA)2]·8H2O (3, H5EA = C2H8O7P2, etidronic acid, CN3H6 = guanidine) were successfully synthesized. The polyoxoanion clusters are in a small boat shape and consist of {(Nb6O19)2(Nb6O20)} unit and two deprotonated RA5−, ZA5−, and EA5− ligands, respectively. Furthermore, PONb 1 can be used as an effective heterogeneous catalyst for the Knoevenagel condensation reaction with high yields and good substrate compatibility under optimal conditions. In addition, PONb 1 also has good catalytic activity in gram-scale reactions.

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双膦酸盐改性船型多氧膦酸盐高效催化knoevenagel缩合
成功合成了三种新型无机-有机杂化多氧烟酸盐（PONbs）， H27K2Na6(H2O)17[K(H2O)(Nb6O19)2(Nb6O20)(RA)2]·13H2O (1, H5RA = C7H11NO7P2, risedronic acid), H21(CN3H6)12[K3(H2O)(Nb6O19)2(Nb6O20)(ZA)2]·5H2O （2, H5ZA = C5H10N2O7P2，唑来膦酸，CN3H6 =胍）和H24(CN3H6)7K2(H2O)4[K3(H2O)2(Nb6O19)2(Nb6O20)(EA)2]·8H2O （3, H5EA = C2H8O7P2, etidronic acid, CN3H6 =胍）。多氧阴离子簇呈小船状，分别由{(Nb6O19)2(Nb6O20)}单元和两个去质子化的RA5−、ZA5−和EA5−配体组成。此外，在最佳条件下，ponb1可以作为Knoevenagel缩合反应的有效多相催化剂，收率高，底物相容性好。此外，PONb 1在克级反应中也具有良好的催化活性。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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来源期刊
Journal of Solid State Chemistry
Journal of Solid State Chemistry 化学-无机化学与核化学
CiteScore
6.00
自引率
9.10%
发文量
848
审稿时长
25 days
期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.
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