Solvothermal reactions of MnCl2with pyridylbenzoic acids gave three-dimensional metal-carboxylate frameworks(MCFs),named MCF-34,MCF-43,and MCF-44,based on one-dimensional Mn-carboxylate chains.The crystal structure,st...Solvothermal reactions of MnCl2with pyridylbenzoic acids gave three-dimensional metal-carboxylate frameworks(MCFs),named MCF-34,MCF-43,and MCF-44,based on one-dimensional Mn-carboxylate chains.The crystal structure,stability,porosity,and framework flexibility of the new compound MCF-44 were studied in detail and compared with its analogs.Depending on their shapes and the bridging angles of the ligands,these compounds possess different network connectivities and porosities.Considering the pyridylbenzote ligands and Mn(II)ions as,respectively,3-and 6-connected nodes,they resemble either the anatase(ant)or rutile(rtl)polymorph of TiO2.Variable-temperature single-crystal X-ray diffraction studies revealed large thermal expansion coefficients for these compounds,which are probably related to the relatively flexible edge-sharing polyhedral structure of their Mn-carboxylate chains.Interestingly,the new compound MCF-44,with its highly porous rtl structure exhibits the largest thermal expansion coefficienct among the coordination polymers reported so far.展开更多
新型冠状病毒(以下简称新冠)疫苗的推广使用极大降低了新冠感染导致的重症和死亡。既往新冠疫苗的效果评估,常常针对年轻和健康群体,在老年群体中的应用效果仍需进一步探讨。本文通过计算机检索Medline、Web of science、中国科学引文...新型冠状病毒(以下简称新冠)疫苗的推广使用极大降低了新冠感染导致的重症和死亡。既往新冠疫苗的效果评估,常常针对年轻和健康群体,在老年群体中的应用效果仍需进一步探讨。本文通过计算机检索Medline、Web of science、中国科学引文数据库和Pubmed关键词,检索截至2023年5月30日,分析了新冠疫苗在老年群体中的安全性和有效性,并探讨了加强剂、混合免疫和异源接种的效果。以期根据老年群体的特点合理研发疫苗,制定适合老年群体的疫苗接种策略。展开更多
基金supported by the National Basic Research Progrem of China(2012CB821706)the National Natural Science Foundation of China(21121061 and 21225105)
文摘Solvothermal reactions of MnCl2with pyridylbenzoic acids gave three-dimensional metal-carboxylate frameworks(MCFs),named MCF-34,MCF-43,and MCF-44,based on one-dimensional Mn-carboxylate chains.The crystal structure,stability,porosity,and framework flexibility of the new compound MCF-44 were studied in detail and compared with its analogs.Depending on their shapes and the bridging angles of the ligands,these compounds possess different network connectivities and porosities.Considering the pyridylbenzote ligands and Mn(II)ions as,respectively,3-and 6-connected nodes,they resemble either the anatase(ant)or rutile(rtl)polymorph of TiO2.Variable-temperature single-crystal X-ray diffraction studies revealed large thermal expansion coefficients for these compounds,which are probably related to the relatively flexible edge-sharing polyhedral structure of their Mn-carboxylate chains.Interestingly,the new compound MCF-44,with its highly porous rtl structure exhibits the largest thermal expansion coefficienct among the coordination polymers reported so far.
文摘新型冠状病毒(以下简称新冠)疫苗的推广使用极大降低了新冠感染导致的重症和死亡。既往新冠疫苗的效果评估,常常针对年轻和健康群体,在老年群体中的应用效果仍需进一步探讨。本文通过计算机检索Medline、Web of science、中国科学引文数据库和Pubmed关键词,检索截至2023年5月30日,分析了新冠疫苗在老年群体中的安全性和有效性,并探讨了加强剂、混合免疫和异源接种的效果。以期根据老年群体的特点合理研发疫苗,制定适合老年群体的疫苗接种策略。
