Coordination versatility of 1,5-bis(salicylidene)carbohydrazide in Ni(II) complexes |
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| Affiliation: | 1. Department of Chemistry, Fu Jen Catholic University, Hsinchuang, New Taipei City 24205, Taiwan, Republic of China;2. Instrumentation Centre, College of Science, National Taiwan University, Taipei 106, Taiwan, Republic of China;1. Department of Chemistry, Faculty of Science, University of Zanjan, 45371-38791 Zanjan, Iran;2. Institute of Physics, Polish Academy of Sciences (PAN), Al. Lotnikow 32/46, PL-02-668 Warsaw, Poland;3. Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383 Wroclaw, Poland;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, PR China;2. Department of Chemistry, Centre for Supramolecular Chemistry and Catalysis, Innovative Drug Research Centre, Shanghai University, Shanghai 200444, PR China;3. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Xianlin Road 163, Nanjing 210023, PR China;1. Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Presidency of Sulaimani Polytechnic University, Kurdistan Region, Iraq |
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| Abstract: | Versatile coordination behavior of a polydentate Schiff base ligand 1,5-bis(salicylidene)carbohydrazide (H3bsc) has been explored in Ni(II) complexes. Ni(H3bsc)2](ClO4)2 (1)·H2O·3CH3CN is a bis chelate mononuclear complex of H3bsc in keto form, and Ni4(H0.5bsc)2(O2CCMe3)3(CH3OH)4](2)·2H2O·2CH3OH is a tetranuclear complex of H3bsc with an unusual coordination. In 2, one phenolate group of the ligand coordinates in a monodentate way and the other coordinates in a μ2-bridging mode to the Ni(II) center. This unusual coordination mode of the ligand stabilizes the Ni(II) complex in a tetranuclear form where the carbonyl oxygen of the ligand exists in between keto and enol form of bond order 1.5. Thus, complex 2, represents an unprecedented coordination behavior of the Schiff base ligand derived from carbohydrazides. Studies of magnetic properties of 2 are reported which reveal antiferromagnetic interaction between four Ni(II) centers. |
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