A cobalt(ii) chain based on pymca generated in situ from the hydrolysis of 2-cyanopyrimidine: spin canting and magnetic relaxation.

Jie Zhang,Miao-Miao Li,Feng Yang,Tuo-Ping Hu,Lei Yin,Zhongwen Ouyang,Zhenxing Wang,Qian-Nan Zhao,Zheng-Cai Xia

doi:10.1039/c9ra05354a

Jie Zhang, Miao-Miao Li + Show 7 more

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https://doi.org/10.1039/c9ra05354a

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Abstract

A one-dimensional (1D) coordination polymer, [{Co2(pymca)2·(H2O)4}SO4·2H2O]n (1) (pymca = 2-carboxypyrimidine), was solvothermally synthesized via the reaction of 2-cyanopyrimidine and Co(SCN)2. A bidentate pymca ligand was formed in situ by the hydrolysis of 2-cyanopyrimidine. Furthermore, in this study, the magnetic properties of complex 1 were investigated in detail. The results indicated that complex 1 showed a single-chain magnet (SCM) behavior below ca. 3 K. The energy barrier (Δτ1/kB) and preexponential factor (τ0) of SCM were 31.2 K and 5.4 × 10−9 s, respectively.

Highlights

Molecule-based magnetic materials with structural diversity have a number of advantages, such as their controllable dimensions, and low energy consumption, which have attracted extensive attention.[1,2,3,4] Among them, single-chain magnets (SCMs), one type of low-dimensional molecule-based magnetic materials, have many kinds of fundamental physical properties[5,6] such as nite-sized effects and a slow relaxation behavior for the magnetization
The magnetic relaxation of the SCM component in antiferromagnetic or metamagnetic phases was discovered in many systems,[13,14,15,16,17,18,19] which indicated that the weak magnetic aDepartment of Chemistry, College of Science, North University of China, Xueyuan Road 3, Taiyuan 030051, P
The Mydosh parameter (4) was estimated to be 0.29 (4 is used to measure the frequency dependence, 4 1⁄4 (DTp/Tp)/D(log f),36b Tp denotes the temperature for the maximum in the c00–T curves, and f is the AC frequency), which was in the range of 0.1–0.3 as expected for the superparamagnetic behavior in SCMs

Summary

Introduction

Molecule-based magnetic materials with structural diversity have a number of advantages, such as their controllable dimensions, and low energy consumption, which have attracted extensive attention.[1,2,3,4] Among them, single-chain magnets (SCMs), one type of low-dimensional molecule-based magnetic materials, have many kinds of fundamental physical properties[5,6] such as nite-sized effects and a slow relaxation behavior for the magnetization. Jie Zhang,a Qian-Nan Zhao,a Feng Yang,b Lei Yin,b Miao-Miao Li,a Zhenxing Wang, b Zhongwen Ouyang,b Zheng-Cai Xia*b and Tuo-Ping Hu *a

Results

Conclusion