Issue 9, 2012
From the journal:

Dalton Transactions

Weak ferromagnetism in chiral diamond-like neutral networks: Mn(2-pymS)2 and Co(2-pymS)2 (2-pymSH = 2-mercaptopyrimidine)†

Jing Zhang,abc   Song Gao,*a   Xi-Xiang Zhang,d   Zhe-Ming Wanga  and  Chi-Ming Che*c  

* Corresponding authors

a Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China
E-mail: gaosong@pku.edu.cn
Fax: 86-10-62751708

b College of Materials Science and Optoelectronics Technology, Graduate University of Chinese Academy of Sciences, Beijing, P. R. China
E-mail: zhangj271@gmail.com
Fax: 86-10-88256701

c Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
E-mail: cmche@hku.hk
Fax: +852 2857-1586

d Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

Abstract

The reactions of 2-mercatopyrimidine with MCl2 (M = Mn2+ or Co2+) in solvothermal conditions result single crystals of Mn(2-pymS)21 and Co(2-pymS)22. The two complexes both have the diamond-like topology frameworks, which could be traced back to the similar way of pyrimidine rings acting as the asymmetric bridging ligands. Interestingly, although they have similar chemical formulas, structural analysis by single-crystal X-ray diffraction studies reveals that the sulfur atoms play different roles in 1 and 2. For 1, the Mn ion lies in a distorted octahedral environment bonded to four nitrogen atoms and two sulfur atoms, whereas the Co ion in a distorted tetrahedral environment only coordinates to nitrogen atoms of pyrimidine ligands in the case of Co(2-pymS)22. More interestingly, although magnetic measurements for both complex 1 and 2 indicate long range magnetic ordering and spin canting below the critical temperature (20 K for 1 and 42.9 K for 2), a hysteresis loop can be observed even at 40 K, which is just below the TC for complex 2, which is distinctly harder than 1.

Graphical abstract: Weak ferromagnetism in chiral diamond-like neutral networks: Mn(2-pymS)2 and Co(2-pymS)2 (2-pymSH = 2-mercaptopyrimidine)

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Article information

DOI
https://doi.org/10.1039/C2DT11738J
Article type
Paper
Submitted
14 Sep 2011
Accepted
29 Nov 2011
First published
20 Jan 2012

Dalton Trans., 2012,41, 2626-2631

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Weak ferromagnetism in chiral diamond-like neutral networks: Mn(2-pymS)2 and Co(2-pymS)2 (2-pymSH = 2-mercaptopyrimidine)

J. Zhang, S. Gao, X. Zhang, Z. Wang and C. Che, Dalton Trans., 2012, 41, 2626 DOI: 10.1039/C2DT11738J

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