{"title":"Bisphosphonate-modified boat-shaped polyoxoniobates for efficient catalysis of knoevenagel condensation","authors":"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","doi":"10.1016/j.jssc.2025.125304","DOIUrl":null,"url":null,"abstract":"<div><div>Three novel inorganic-organic hybrid polyoxoniobates (PONbs), H<sub>27</sub>K<sub>2</sub>Na<sub>6</sub>(H<sub>2</sub>O)<sub>17</sub>[K(H<sub>2</sub>O)(Nb<sub>6</sub>O<sub>19</sub>)<sub>2</sub>(Nb<sub>6</sub>O<sub>20</sub>)(RA)<sub>2</sub>]·13H<sub>2</sub>O (<strong>1</strong>, H<sub>5</sub>RA = C<sub>7</sub>H<sub>11</sub>NO<sub>7</sub>P<sub>2</sub>, risedronic acid<strong>)</strong>, H<sub>21</sub>(CN<sub>3</sub>H<sub>6</sub>)<sub>12</sub>[K<sub>3</sub>(H<sub>2</sub>O)(Nb<sub>6</sub>O<sub>19</sub>)<sub>2</sub>(Nb<sub>6</sub>O<sub>20</sub>)(ZA)<sub>2</sub>]·5H<sub>2</sub>O (<strong>2</strong>, H<sub>5</sub>ZA = C<sub>5</sub>H<sub>10</sub>N<sub>2</sub>O<sub>7</sub>P<sub>2</sub>, zoledronic acid, CN<sub>3</sub>H<sub>6</sub> = guanidine<strong>)</strong> and H<sub>24</sub>(CN<sub>3</sub>H<sub>6</sub>)<sub>7</sub>K<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>[K<sub>3</sub>(H<sub>2</sub>O)<sub>2</sub>(Nb<sub>6</sub>O<sub>19</sub>)<sub>2</sub>(Nb<sub>6</sub>O<sub>20</sub>)(EA)<sub>2</sub>]·8H<sub>2</sub>O (<strong>3</strong>, H<sub>5</sub>EA = C<sub>2</sub>H<sub>8</sub>O<sub>7</sub>P<sub>2</sub>, etidronic acid, CN<sub>3</sub>H<sub>6</sub> = guanidine<strong>)</strong> were successfully synthesized. The polyoxoanion clusters are in a small boat shape and consist of {(Nb<sub>6</sub>O<sub>19</sub>)<sub>2</sub>(Nb<sub>6</sub>O<sub>20</sub>)} unit and two deprotonated RA<sup>5−</sup>, ZA<sup>5−</sup>, and EA<sup>5−</sup> ligands, respectively. Furthermore, PONb <strong>1</strong> 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 <strong>1</strong> also has good catalytic activity in gram-scale reactions.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"347 ","pages":"Article 125304"},"PeriodicalIF":3.5000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Solid State Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022459625001276","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/7 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
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.
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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