Layered manganese 4-phosphonoisophthalates (4-piH_4) embedding Mn-O chains with metamagnetism in Mn_3(4-piH)_2(H_2O)_3·H_2O  

作　　者：JIN HaoJun WANG PengFei BAO SongSong ZHENG LiMin YAO Cheng 

机构地区：[1]State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China [2]College of Science, Nanjing University of Technology, Nanjing 210009, China

出　　处：《Science China Chemistry》2012年第6期1047-1054,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (90922006);the Natural Science Foundation of Jiangsu Province (BK2009009)

摘　　要：Two manganese phosphonates Mn3（4-piH）2（H2O）3·H2O （1） and Mns（4-piH）2（4-piH2）2（phen）2（H2O）4 （2） （4-pill4 = 4-phosphonoisophthalic acid, phen = 1,10-phenanthroline） have been synthesized under hydrothermal conditions in the pres- ence of organic co-ligand. Both compounds exhibit layer structures but with different topologies. In compound 1, a complicated ＂ladder-like＂ chain of {Mn3O3}O2 which contains three- and six-member rings made up of triangular shaped {Mn3O3} tri- mers is found. The chains are linked by the PO3C groups to form an inorganic layer. The phenyl and protonated carboxylate groups are pendent between the layers with extensive hydrogen bonds. In compound 2, tetramers of {MnnO6 } are connected by the { MnO6 } octahedra through corner-sharing to form an infinite chain, which is further bridged by 4-pill3- ligands into a thick hybrid layer. Magnetic measurements reveal that antiferromagnetic interactions are dominant in both compounds. Metamag- netism is observed in compound 1 at low temperature, while no long range ordering is found in compound 2 down to 1.8 K.Two manganese phosphonates Mn3(4-piH)2(H2O)3·H2O (1) and Mn5(4-piH)2(4-piH2)2(phen)2(H2O)4 (2) (4-piH4 = 4-phosphonoisophthalic acid, phen = 1,10-phenanthroline) have been synthesized under hydrothermal conditions in the presence of organic co-ligand. Both compounds exhibit layer structures but with different topologies. In compound 1, a complicated "ladder-like" chain of {Mn3O3}O2 which contains three- and six-member rings made up of triangular shaped {Mn3O3} trimers is found. The chains are linked by the PO3C groups to form an inorganic layer. The phenyl and protonated carboxylate groups are pendent between the layers with extensive hydrogen bonds. In compound 2, tetramers of {Mn4O6} are connected by the {MnO6} octahedra through corner-sharing to form an infinite chain, which is further bridged by 4-piH3- ligands into a thick hybrid layer. Magnetic measurements reveal that antiferromagnetic interactions are dominant in both compounds. Metamag- netism is observed in compound 1 at low temperature, while no long range ordering is found in compound 2 down to 1.8 K.

关 键 词：MANGANESE carboxylate-phosphonate coordination polymer magnetic property METAMAGNETISM 

分 类 号：O643.1[理学—物理化学] S812[理学—化学]