基于吡啶基桥联配体的自旋交叉配位聚合物的合成及磁性研究

发布时间：2018-03-15 07:26

本文选题：自旋交叉　切入点：超分子异构　出处：《南京大学》2017年硕士论文　论文类型：学位论文

【摘要】：自旋交叉即分子在特定的外界条件下(如温度、压力、光、强磁场等)发生的低自旋态(low-spin,LS)和高自旋态(high-spin,HS)之间的相互转变现象。这种独特的磁行为使得他们在信息存储和光学器件方面具有潜在的应用能力。近些年来,随着磁性材料科学研究的深入,研究者普遍认为通过自旋交叉材料与多孔配位聚合物的交叉,通过多孔配位聚合物吸收客体分子并引起化合物磁性的变化。这类化合物一定能在分子感应领域迸发出活力。于是我们便想到合成自旋交叉型配位聚合物,我们利用不同的配体分子,合成了一系列自旋交叉配合物,并研究了他们的结构,磁性以及磁构关系。主要结果如下:1.我们利用 dpsme(dpsme=4,4'-di(pyridylthio)methane)配体合成了一系列Fe(dpsme)_2(XCN)_2(X=S,Se,BH3),并且发现这个体系的分子在合成过程中,选用不同的溶剂会得到不同的空间构型,也就是超分子异构现象。在这7例分子中,化合物1-6表现为高自旋顺磁性,化合物7表现出渐变型不完全自旋转变。2.我们利用4,4-联吡啶配体合成了一例典型的三维Hofmann型结构化合物8。并发现该化合物在二氯甲烷中浸泡一天会发生"单晶到单晶"的转变。化合物8为高自旋顺磁性,将其浸泡于丙酮一周后会变成一个具有10K左右滞回的自旋交叉化合物10。3.运用3,5-二氯吡啶和3-氨基-5-氯吡啶合成了两例二维Hofmann型化合物,全都表现为高自旋。4.研究了一系列混合配体化合物Fe(3-Fpy)_n(3-Clpy)_(2-n)[Pt(CN)_4]的磁性,发现了一种简单的控制这种体系自旋转变温度的方法。
[Abstract]:Spin-crossing is a process in which molecules are subjected to specific external conditions (such as temperature, pressure, light, The interaction between the low-spin LSs) and the high-spin high-spin HSs (high magnetic field, etc.) makes them potentially useful in information storage and optical devices in recent years. With the development of magnetic material science, researchers generally believe that the cross between spin-crossing materials and porous coordination polymers, Through porous coordination polymers, the guest molecules are absorbed and the magnetic properties of the compounds are changed. These compounds are bound to burst out in the field of molecular sensing, so we think about the synthesis of spin-cross coordination polymers. We have synthesized a series of spin cross complexes using different ligand molecules and studied their structures. The main results are as follows: 1. We have synthesized a series of Fedpsmemestrin 2XCNN SXSe BH3s by using the DPSMED DPSMEN 4G 4U -dipyridylthiomethanea ligands, and we have found that the molecules of this system have different spatial configurations when different solvents are used in the synthesis process, and the main results are as follows: (1) the main results are as follows: 1.The main results are as follows: (1) the main results are as follows: 1. That is, supramolecular isomerization. In these seven cases, compounds 1-6 exhibit high spin paramagnetic properties. Compound 7 shows a gradual incomplete spin transition. 2. We synthesized a typical three-dimensional Hofmann structure compound 8 using 4o 4- bipyridine ligand. It was found that the compound was immersed in dichloromethane for one day. Conversion of single Crystal ". Compound 8 is highly spin paramagnetic, After immersing it in acetone for a week, it will become a spin cross compound with hysteresis of about 10K. Two cases of two-dimensional Hofmann type compounds were synthesized by using 3O5-dichloropyridine and 3-amino-5-chloropyridine. The magnetic properties of a series of mixed ligands Feo _ 3-FpyN _ (+) _ (2) [Pt(CN)_4] [Pt(CN)_4] have been studied, and a simple method to control the spin transition temperature of this system has been found.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4

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