Issue 14, 2011
From the journal:

Dalton Transactions

A low-dimensional molecular spin system with two steps of magnetic transitions and liquid crystal property†

Hai-Bao Duan,a   Xiao-Ming Ren,*ab   Lin-Jiang Shen,a   Wan-Qin Jin,a   Qing-Jin Meng,b   Zheng-Fang Tiana  and  Shi-Ming Zhou*c  

* Corresponding authors

a State Key Laboratory of Materials-Oriented Chemical Engineering and College of Science, Nanjing University of Technology, Nanjing, P.R. China
E-mail: xmren@njut.edu.cn
Fax: +86-25-83587438
Tel: +86-25-83587820

b State Key Laboratory & Coordination Chemistry Institute, Nanjing University, Nanjing, P. R. China
E-mail: xmren@njut.edu.cn
Fax: +86-25-83587438
Tel: +86-25-83587820

c Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui, P. R. China
E-mail: zhousm@ustc.edu.cn
Fax: +86-25-83587438
Tel: +86-25-83587820

Abstract

A low-dimensional compound [C6-Apy][Ni(mnt)2] (1, where mnt2− = maleonitriledithiolate, C6-Apy+ = 4-amino-1-hexylpyridinium) has been designed and synthesized, which has layer arrangement of anions and cations and shows two steps of magnetic transitions. The low temperature magnetic transition has an uncommon hysteresis loop, while the crystal structure investigations disclosed no structural transition with the magnetic transition. The high temperature magnetic transition exhibits two remarkable features: (1) it synchronously occurs with a crystalline-to-mesophase transition in the first heating process and (2) the structural changes that accompany the solid-mesophase transition are irreversible. A diamagnetic and isostructural compound, [C6-Apy][Cu(mnt)2], is further characterized by structure, DSC and POM techniques, which revealed also the existence of an irreversible crystalline-to-mesophase transition in the same temperature interval of [C6-Apy][Ni(mnt)2]. Therefore, the high-temperature magnetic transition in 1 is driven by release of the structural strains, but not magnetoelastic interactions. The mesophase exhibits the characteristic of smectic A phase, and the alkyl chain melting in the cation layers probably lead to the formation of mesophase. It is noticeable that the finding of a mesophase occurring in a hexyl hydrocarbon chain molecular system is in contrast to a suggested rule that at least a dodecyl chain is required. Our results will shed a light on the design and preparation of a new low-dimensional molecular system combining magnetic transition and liquid crystal properties.

Graphical abstract: A low-dimensional molecular spin system with two steps of magnetic transitions and liquid crystal property

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Article information

DOI
https://doi.org/10.1039/C0DT01704C
Article type
Paper
Submitted
05 Dec 2010
Accepted
04 Feb 2011
First published
04 Mar 2011

Dalton Trans., 2011,40, 3622-3630

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A low-dimensional molecular spin system with two steps of magnetic transitions and liquid crystal property

H. Duan, X. Ren, L. Shen, W. Jin, Q. Meng, Z. Tian and S. Zhou, Dalton Trans., 2011, 40, 3622 DOI: 10.1039/C0DT01704C

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