An Oxalate‐Bridged Copper(II) Dimer and a Mononuclear Cobalt(III) Azide Complex Containing N‐Nitrile‐Functionalized 1, 4, 7‐Triazacyclononane Terminals: Synthesis,Crystal Structure,and Magnetic Characterization |
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| Authors: | Zhong Zhang Da‐Lin Shao Zhi‐Rong Geng Prof Dr Zhi‐Lin Wang |
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| Institution: | 1. State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing University, Nanjing 210093, P. R. China;2. Key Laboratory for the Chemistry and Molecular Engineering, of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering, Guangxi Normal University, Guilin 541004, P. R. China |
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| Abstract: | The stable dinuclear Cu(μ‐C2O4)Cu]2+ entity is facially coordinated at each end by a N‐nitrile functionalized triazamacrocycle, 1, 4, 7‐tris(cyanomethyl)‐1, 4, 7‐triazacyclononane ( L ), to generate a centrosymmetric compound Cu2 L 2(μ‐C2O4)](ClO4)2 · 4DMF ( 1 ) containing a bis‐bidentate oxalate bridge. The variable‐temperature magnetic measurement for the crystallographically characterized compound exhibits quite strong antiferromagnetic coupling interaction between two oxalate‐linked CuII atoms separated by 5.149 Å with a singlet‐triplet energy gap of –345.5 cm–1. On the other hand, a mononuclear CoIII compound Co L (N3)3] · 2.5H2O ( 2 ) with monodentate azide terminal groups was synthesized. Structural elucidation by X‐ray diffraction shows that the compound has crystallographically imposed C3 symmetry. Enantiomerically pure crystals were obtained upon crystallization indicated by a Flack parameter of 0.04(5). |
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| Keywords: | Copper Cobalt Oxalate Nitrile functionalized 1 4 7‐triazacyclononane Magnetic properties |
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