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Two-Dimensional Copper Coordination Polymer Assembled with Fumarate and 5,5’-Dimethyl-2,2’-bipyridine: Synthesis, Crystal Structure and Magnetic Properties
Journal of Chemical Crystallography ( IF 0.8 ) Pub Date : 2021-06-01 , DOI: 10.1007/s10870-021-00893-2
Antonio Téllez-López , Raúl A. Morales-Luckie , Diego Martínez-Otero , Víctor Sánchez-Mendieta , Roberto Escudero , Francisco Morales

Abstract

[[Cu(fum)(dmb)]·H2O]n (1) (fum = fumarate; dmb = 5,5’-dimethyl-2,2’-bipyridine) was obtained by a self-assembly solution reaction, at ambient conditions, and characterized by elemental analysis, IR spectroscopy and X-ray single crystal diffraction. Crystallographic studies show that 1 crystallizes in a triclinic system with a P-1 space group, with a = 8.2308(2) Å, b = 9.7563(2) Å, c = 10.3990(2) Å; α = 80.3444(4)°, β = 77.9517(4)°, γ = 82.0440(5)°; V = 800.45(3) Å3. The Cu(II) centers are five-coordinated with a distorted square pyramidal configuration. The formation of a two-dimensional (2D) array in 1 can be explained by the presence of two different coordination modes in the fumarate ligand: μ-η10 and μ220, both in a bridging monodentate manner, the latter generating distinctive rhombic-dinuclear units. The thermal stability of 1 has also been analyzed. Magnetic measurements revealed that this polymer exhibits weak antiferromagnetic ordering.

Graphical Abstract

[[Cu(fum)(dmb)]·H2O]n, exhibiting weak antiferromagnetic interactions, displays a two-dimensional array comprised of rhombic dinuclear units, where the carboxylate moieties of fumarate bridging ligand displays monodentate and oxo-bridging coordination modes connecting two Cu centers.



中文翻译:

富马酸盐和 5,5'-二甲基-2,2'-联吡啶组装的二维铜配位聚合物:合成、晶体结构和磁性

摘要

[[Cu(fum)(dmb)]·H 2 O] n ( 1 ) (fum = fumarate; dmb = 5,5'-二甲基-2,2'-联吡啶)通过自组装溶液反应获得,在环境条件下,并通过元素分析、红外光谱和 X 射线单晶衍射表征。晶体学研究表明1在具有P-1空间群的三斜晶系​​中结晶,a  = 8.2308(2) Å,b  = 9.7563(2) Å,c  = 10.3990(2) Å;α = 80.3444(4)°,β = 77.9517(4)°,γ = 82.0440(5)°;V = 800.45(3) Å 3。Cu(II) 中心是五配位的,具有扭曲的方形金字塔结构。二维 (2D) 数组的形成图1可以通过富马酸酯配体中两种不同配位模式的存在来解释:μ-η 10和μ 220,两者均以桥接单齿方式,后者产生独特的菱形-双核单元。还分析了1的热稳定性。磁性测量表明该聚合物表现出弱的反铁磁有序性。

图形概要

[[Cu(fum)(dmb)]·H2O]n,表现出弱的反铁磁相互作用,显示出由菱形双核单元组成的二维阵列,其中富马酸酯桥连配体的羧酸根部分显示出连接两个的单齿和氧代桥接配位模式。铜中心。

更新日期:2021-06-02
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