Abstract

A new chiral one-dimensional gadolinium coordination polymer [Gd(HDTTA)₃(CH₃OH)₃]_n (1) (D-H₂DTTA = (+)-Di-p-toluoyl-D-tartaric acid) was synthesized at room temperature, and fully structurally characterized by Infrared (IR), elemental analysis (EA), single-crystal and powder X-ray diffraction (PXRD). The structure analysis shows that complex 1 belongs to the trigonal system with R3 space group and displays an infinite chain structure along the c axis. In 1, each Gd³⁺ cation is in the tri-capped trigonal prism geometry, and neighboring Gd³⁺ cations are connected by three partly deprotonated HDTTA⁻ ligands with the Gd···Gd distance of 7.686(1) Å. The circular dichroism (CD) spectrum demonstrates the chirality of the complex. Magnetic studies reveal that complex 1 displays weak antiferromagnetic interactions between Gd³⁺ cations and it exhibits a small magnetic entropy change (−ΔS _m = 7.26 J kg⁻¹ K⁻¹ with ΔH = 7 T and T = 2.5 K) because of long Gd···Gd distance and relatively low magnetic density.

摘要

在室温下合成了一种新的手性一维g配位聚合物[Gd（HDTTA）₃（CH ₃ OH）₃ ] _n（1）（DH ₂ DTTA =（+）-Di-p-toluoyl-D-酒石酸）温度，并通过红外（IR），元素分析（EA），单晶和粉末X射线衍射（PXRD）对结构进行全面表征。结构分析表明，复合物1属于具有R 3空间群的三角系统，并且沿c轴显示无限链结构。在1中，每个Gd ³⁺阳离子处于三封三角棱镜的几何形状中，并且相邻的Gd ³⁺阳离子由三个部分地去质子化HDTTA连接^-配体与7.686（1）的钆...钆距离。圆二色性（CD）光谱证明了该络合物的手性。磁性的研究表明，复杂1个的Gd之间显示弱的反铁磁相互作用³⁺的阳离子和它显示出小的磁熵变（-Δ小号 _米= 7.26Ĵ千克^-1 ķ ^-1与Δ ħ  = 7 T和Ť  = 2.5 K），因为Gd···Gd距离较长且磁密度相对较低。