Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

A New Quinoxalinyl-Substituted Nitronyl Nitroxide Radical and its Five-Spin CuII and Four-Spin MnII Complexes: Syntheses, Crystal Structures, and Magnetic Properties

Chao Wang A , Yue Ma A B D , Yali Wang A , Qinglun Wang A , Licun Li A , Peng Cheng A and Daizheng Liao A C

A Department of Chemistry, Nankai University, Tianjin 300071, P. R. China.

B Tianjin Key Lab on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, P. R. China.

C State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, P. R. China.

D Corresponding author. Email: maynk@nankai.edu.cn

Australian Journal of Chemistry 65(6) 672-679 http://dx.doi.org/10.1071/CH12077
Submitted: 5 February 2012  Accepted: 20 March 2012   Published: 3 May 2012

Abstract

A new radical of QNXL-2NIT (1) (QNXL-2NIT = 2-(2-quinoxalinyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide) and its complexes [Cu(hfac)2]3(QNXL-2NIT)2·2CHCl3 (2) and [Mn(hfac)2]2(QNXL-2NIT)2 (3) (hfac = 1,1,1,5,5,5-hexfluoroacetylacetone) were first reasonably designed and synthesised in this paper. The X-ray structure determination revealed that by introducing the quinoxalinyl ring group to the nitronyl nitroxide radical, QNXL-2NIT affords more coordination sites for metal ions. We successfully obtained its copper complex with linear tri-nuclear five-spin structure. However, when we substituted MnII as the central metal, complex 3 exhibits a rectangle-like four-spin framework containing two MnII ions and two radicals in one molecule. The magnetic study of the two complexes shows that there are strong antiferromagnetic interactions between the radical and the terminal CuII ions with g = 2.25, J = –291.67 cm–1 and zJ′ = –0.25 cm–1 and the dominating interactions between the MnII ion and the radical in complex 3 are also antiferromagnetic with the parameters of g = 1.99, J 1 = –77.00 cm–1 and J 2 = 0.34 cm–1.

Graphical Abstract Image


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