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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A series of manganese-carboxylate coordination polymers exhibiting diverse magnetic properties
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A series of manganese-carboxylate coordination polymers exhibiting diverse magnetic properties

机译:一系列具有多种磁性的锰羧酸盐配位聚合物

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The hydrothermal reactions of an asymmetrical 4-(4-carboxyphenylamino)-3,5-dinitrobenzoic acid (H(2)cpdba), MnCl2 center dot 4H(2)O, or together with 2,2 '-bipyridine (2,2 '-bpy) or 4,4 '-bipyridine (4,4 '-bpy) afford three novel molecule-based magnetic coordination polymers [Mn(cpdba)](n) (1), {[Mn-2(cpdba)(2)(2,2 '-bpy)(2)(H2O)(2)]center dot H2O}(n) (2) and {[Mn-2(cpdba)(2)(4,4 '-bpy)]center dot 2H(2)O}(n) (3). Compound 1 has a 3D acentric coordination network containing carboxylate-bridged 1D ladder-like manganese chains with spin-canted antiferromagnetism (J = -3.51 cm(-1) for the coupling along the ladder legs, and zJ ' = 0.22 cm(-1) for coupling along the ladder rungs), whereas compounds 2 and 3 crystallize in the centrosymmetric space groups P (1) over bar and C2/c, respectively. 2 exhibits a 1D chain structure, which is extended into a 3D supramolecular network by pi-pi stacking interactions, while 3 features a quite complex 3D network built up from the cpdba(2-) and 4,4 '-bpy spacers as well as the carboxylate-bridged Mn(II) chains. Both 2 and 3 show weak antiferromagnetic coupling interactions (J = -0.55 cm(-1) for 2), and a field-induced spin-flop magnetic transition can also be observed in 2 at ca. 3.2 T at 2 K.
机译:不对称的4-(4-羧基苯基氨基)-3,5-二硝基苯甲酸(H(2)cpdba),MnCl2中心点4H(2)O或与2,2'-联吡啶(2,2 '-bpy)或4,4'-联吡啶(4,4'-bpy)提供了三种新型的基于分子的磁配位聚合物[Mn(cpdba)](n)(1),{[Mn-2(cpdba)( 2)(2,2'-bpy)(2)(H2O)(2)]中心点H2O}(n)(2)和{[Mn-2(cpdba)(2)(4,4'-bpy) ]中心点2H(2)O}(n)(3)。化合物1具有一个3D偏心配位网络,其中包含带有桥联的自旋倾斜反铁磁性(J = -3.51 cm(-1)的羧酸盐桥连的1D梯状锰链,沿着梯子腿耦合,zJ'= 0.22 cm(-1) )沿着梯级耦合),而化合物2和3分别在bar和C2 / c上的中心对称空间群P(1)中结晶。 2展示了1D链结构,通过pi-pi堆叠相互作用将其扩展为3D超分子网络,而3展示了由cpdba(2-)和4,4'-bpy间隔基以及羧酸桥联的Mn(II)链。 2和3都显示弱的反铁磁耦合相互作用(J = -0.55 cm(-1)for 2),并且还可以在大约2的2中观察到场感应的自旋触发器磁跃迁。在2 K下为3.2T。

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