Isolation of p-tricyanovinylphenyldicyanomethide ion via a [2+2] cycloaddition of 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules |
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| Authors: | Qi-Ying Lv Shi-Di Tang Xing-Wu Tan Wen-Jun Lei Ye Wang Hou-Keng Lin Ze-Quan Wu Shu-Zhong Zhan |
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| Affiliation: | aCollege of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | In the presence of CoCl2·6H2O and dppm (bis(diphenylphosphino) methane), the reaction of TCNQ (7,7,8,8-tetracyanoquinodimethane) molecules by [2+2] cycloaddition forms a p-tricyanovinylphenyldicyanomethide ion (PCQ−), which has been obtained as one anion unit in one new compound [Co(dppmdo)3][PCQ−]2·H2O 1 (dppmdo = bis(diphylphospine oxide) methane). Its structure was determined by X-ray crystallography: 1 crystallizes in  with a = 14.174(3) Å, b = 19.553(4) Å, c = 19.776(4) Å, α = 112.72(3)°, β = 95.43(3)°, γ = 110.79(3)°, and Z = 2. It was characterized by IR spectra, UV–Vis spectra, and cyclic voltammogram. Magnetic properties indicate that no magnetic coupling between PCQ− and [Co(dppmdo)3]2+ unit. |
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| Keywords: | P-ligand Crystal structure Co complex [2+2] Cycloaddition |
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