Citation: ZHANG You-Juan, YANG Jin-Hui, WANG Jun-Jie, CHEN Jing. Synthesis, Crystal Structure and Magnetic Properties of a Cobalt(II) Complex with Quinoxaline-substituted Nitronyl Nitroxide Radicals[J]. Chinese Journal of Structural Chemistry, ;2016, 35(6): 959-964. doi: 10.14102/j.cnki.0254-5861.2011-0970 shu

Synthesis, Crystal Structure and Magnetic Properties of a Cobalt(II) Complex with Quinoxaline-substituted Nitronyl Nitroxide Radicals

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a. College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455002, China;
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b. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450052, China

Corresponding author: CHEN Jing,
Received Date: 6 September 2015
Available Online: 29 October 2015
Fund Project: The work was supported by the National Natural Science Foundation of China (No. 21071006) (No. 21071006) the Natural Science Foundation of Henan Province (No. 102102210457) (No. 102102210457)the Natural Science Foundation of the Henan Higher Education Institutions of China (No. 2010B150001) (No. 2010B150001)

A new complex with the formula [Co(acac)₂(NITQ)₂]·2CH₂Cl₂ 1 (acac = acety- lacetone, NITQ = 2-(2´-quinoxalinyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), was synthe- sized and elucidated structurally as well as magnetically in detail. The crystal belongs to the mono- clinic system, space group P2₁/c with a = 9.6896(1), b = 20.539(4), c = 12.147(2) Å, β = 93.84(3)°, M_r = 997.65, V = 2412.1(8) Å³, Z = 2, D_c = 1.374 g/cm³, F(000) = 1038, m = 0.635 mm^-1, the final R = 0.0539 and wR = 0.1289 for 5998 observed reflections (I > 2σ(I)). The Co(II) ion is coordinated by two nitrogen atoms of quinoxaline rings from two NITQs and four oxygen atoms from two acac ions to complete a distorted octahedral coordination environment. Compound 1 is further linked into a three-dimensional (3D) supramolecular network by hydrogen-bonding, Cl…O weak contact and π…π stacking interactions. The magnetic measurements show compound 1 exhibits weak ferroma- gnetic interactions.
- crystal structure,
- nitronyl nitroxide,
- Co(II) compound,
- magnetic properties
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