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首页> 外文期刊>Crystal growth & design >A new family of 4f-3d heterometallic metal-organic frameworks with 2,2'-bipyridine-3,3'-dicarboxylic acid: Syntheses, structures and magnetic properties
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A new family of 4f-3d heterometallic metal-organic frameworks with 2,2'-bipyridine-3,3'-dicarboxylic acid: Syntheses, structures and magnetic properties

机译:具有2,2'-联吡啶-3,3'-二羧酸的4f-3d杂金属金属有机骨架的新家族:合成,结构和磁性

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摘要

Eight isostructural lanthanide(III)-cobalt(II) heterometallic metal-organic frameworks (MOFs), {[Ln2Co- (BPDC)_4(H_2O) _6]·xH_2O}_n (Ln = La (1-La, x = 9), Pr (2-Pr, x = 11), Nd (3-Nd, x = 8), Sm (4-Sm, x = 9), Eu (5-Eu, x = 6), Gd (6-Gd, x = 6.5), Tb (7-Tb, x = 7), Dy (8-Dy, x = 8); H2BPDC = 2,2'-bipyridine-3,3'- dicarboxylic acid), have been prepared and characterized. In these complexes, two crystallographically independent Ln3+ ions are connected via carboxyl groups into binuclear units, which are further linked into a lanthanide chain through bridging BPDC2-. Each Co2+ ion is chelated by the bipyridine groups of three BPDC2- and further links the lanthanide chain to form a three-dimensional framework. The framework with one-dimensional channels occupied by water molecules possesses a new topology with the short (Schlafli) vertex symbol {3·6~2}{3~2·6 ~6·7~3·8~3·9}{6 ~2·7}. The magnetic properties of the eight heterometallic MOFs have been studied, in which only 8-Dy displays slow relaxation of the magnetization at low temperature.
机译:八个同构的镧系元素(III)-钴(II)异金属金属有机骨架(MOF),{[Ln2Co-(BPDC)_4(H_2O)_6]·xH_2O} _n(Ln = La(1-La,x = 9) ,Pr(2-Pr,x = 11),Nd(3-Nd,x = 8),Sm(4-Sm,x = 9),Eu(5-Eu,x = 6),Gd(6-Gd ,x = 6.5),Tb(7-Tb,x = 7),Dy(8-Dy,x = 8); H 2 BPDC = 2,2′-联吡啶-3,3′-二羧酸),并且表征。在这些络合物中,两个晶体学独立的Ln3 +离子通过羧基连接到双核单元中,双核单元通过桥接BPDC2-进一步连接成镧系元素。每个Co2 +离子都被三个BPDC2-的联吡啶基螯合,并进一步连接镧系元素链以形成三维框架。一维通道被水分子占据的框架具有新的拓扑结构,其短(Schlafli)顶点符号为{3·6〜2} {3〜2·6〜6·7〜3·8〜3·9} { 6〜2·7}。已经研究了八个异金属MOF的磁性能,其中只有8-Dy在低温下显示出缓慢的磁化弛豫。

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