The chain-shaped coordination polymers based on the bowl-like Ln_(18)_(Ni24(23.5))clusters exhibiting favorable low-field magnetocaloric effect  

作　　者：Ningfang Li Qingfang Lin Yemin Han Zeyu Du Yan Xu 

机构地区：[1]College of Chemical Engineering,State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210093,China [2]Department of Chemistry,Bengbu Medical College,Bengbu 233030,China

出　　处：《Chinese Chemical Letters》2021年第12期3803-3806,共4页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation of China (No. 21571103);Jiangsu (No. BK20191359);the Project of Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (No. KJ2019A0350)。

摘　　要：The design of assembling high-nuclearity transition-lanthanide(3d-4f) clusters along with excellent magnetocaloric effect(MCE) is one of the most prominent fields but is extremely challenging. Herein, two heterometallic metal coordination polymers are constructed via the “carbonatetemplate” method, formulated as {[Gd_(18)Ni_(24)(IDA)_(22)(CO_(3))_(7)(μ_(3)-OH)_(32)(μ_(2)-OH)_(3)(H_(2)O)_(5)Cl]·Cl_(8)·(H_(2)O)_(14)}nand{[Eu_(18)Ni_(23.5)(IDA)_(22)(CO_(3)_(7)(μ_(3)-OH)_(32)(H_(2)O)_(5)(IN)(CH_(3)COO)_(2)(NH_(2)CH_(2)COO)Cl]·C_(l6)·(H_(2)O)_(17)}n[abbreviated as 1-(Gd_(18)Ni_(24))nand 2-(Eu_(18)Ni_(23.5))n respectively;H_(2)IDA = iminodiacetic acid;HIN = isonicotinic acid]. Concerning the structures, compounds 1-(Gd_(18)Ni_(24))nand 2-(Eu_(18)Ni_(23.5))nboth feature the one-dimensional(1D) chain-like structure which is rarely reported in high-nuclearity metal complexes. Meanwhile, the large presences of Gd3+ ions in compound 1-(Gd18Ni24)nare conducive to the fantastic MCE, and the value of-ΔS_(m)is 35.30 J kg^(-1)K^(-1) at 3.0 K and ΔH = 7.0 T. And more significantly, compound 1-Gd_(18)Ni_(24)n shows the large low-field magnetic entropy change(-ΔS_(m)= 20.95 J kg(-1) K(-1) at 2.0 K and ΔH = 2.0 T)among the published 3 d-4 f mixed metal clusters.

关 键 词：3d-4f Anionic templets Chain-like structure High-nuclearity clusters Magnetic refrigeration Mixed-ligand method 

分 类 号：O641.4[理学—物理化学]