Issue 3, 2008
From the journal:

Dalton Transactions

Strong electron-accepting methylviologen dication confined in magnetic hosts: synthesis, structural characterization, charge-transfer and magnetic properties of {(MV)2[Ni(SCN)5]·Cl·2H2O}n and {(MV)[M(N3)2(SCN)2]}n (M = Mn, Co)†‡

Zhan-Feng Ju,a   Qing-Xia Yao,a   Wei Wua  and  Jie Zhang*a  

* Corresponding authors

a State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou, China
E-mail: zhangjie@fjirsm.ac.cn
Fax: +86 (0)591 8371 0051

Abstract

Three hybrid host–guest compounds {(MV)2[Ni(SCN)5]·Cl·2H2O}n (1), {(MV)[Mn(N3)2(SCN)2]}n (2) and {(MV)[Co(N3)2(SCN)2]}n (3) (where MV2+ = methylviologen dication) have been obtained by self-assembly methods and characterized by X-ray crystallography, spectral methods and magnetic measurements. Compound 1 shows a quasi-two-dimensional structure which is formed by novel single thiocyanate-bridged Ni(II) chains connected through S⋯S interactions. Compounds 2 and 3 are isostructural, containing single µ1,3-azide bridged Mn(II)/Co(II) square layers. MV2+, as a strong electron-acceptor and a template, is embedded between the anionic layers in all three compounds. The charge-transfer (CT) interactions between MV2+ and the anionic hosts have been revealed by structural analysis and UV-vis diffuse reflection spectroscopy. The magnetic studies of the compounds show antiferromagnetic interactions between adjacent metal ions (J = –34.52(7) cm–1 for 1, J = –3.90(2) cm–1 for 2 and J = –10.96(6) cm–1 for 3).

Graphical abstract: Strong electron-accepting methylviologen dication confined in magnetic hosts: synthesis, structural characterization, charge-transfer and magnetic properties of {(MV)2[Ni(SCN)5]·Cl·2H2O}n and {(MV)[M(N3)2(SCN)2]}n (M = Mn, Co)

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Article information

DOI
https://doi.org/10.1039/B710628A
Article type
Paper
Submitted
11 Jul 2007
Accepted
21 Nov 2007
First published
10 Dec 2007

Dalton Trans., 2008, 355-362

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Strong electron-accepting methylviologen dication confined in magnetic hosts: synthesis, structural characterization, charge-transfer and magnetic properties of {(MV)2[Ni(SCN)5]·Cl·2H2O}n and {(MV)[M(N3)2(SCN)2]}n (M = Mn, Co)

Z. Ju, Q. Yao, W. Wu and J. Zhang, Dalton Trans., 2008, 355 DOI: 10.1039/B710628A

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