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Tetranuclear mixed-valence Co(II/III) and binuclear Ni(II) complexes incorporating hydroxyl-rich ligand: Syntheses, structures and magnetic properties |
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| Authors: | Su-Yun Zhang Bin Xu Wenqian Chen Wu Li |
| Institution: | a Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Soochow University, Suzhou 215123, China b Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China c State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China |
| Abstract: | Three complexes of composition Co2IICo2III(H2hbhpd)2(H4hbhpd)2(H2O)2]Cl2(CH3OH)4 (1), Co2IICo2III(H2hbhpd)2(H4hbhpd)2(H2O)2](NO3)2(CH3OH)4 (2) and Ni2(H4hbhpd)2(NO3)](NO3)(CH3OH)1.5 (3) (H5hbhpd = 2-(2-hydroxy-benzylamino)-2-hydroxymethyl-propane-1,3-diol) have been synthesized and their structures have been characterized. Complexes 1 and 2 are mixed-valence cobalt clusters and display face-sharing monovacant dicubane structures. In the complexes 1 and 2, one of the three alkyl hydroxyl groups of H5hbhpd ligand is deprotonated instead of deprotonation of phenyl hydroxyl group; thus monoanionic H4hbhpd− ligand displays novel η3, η1, η1, μ3 coordination mode. Complex 3 is binuclear, and the two metal centers of 3 are bridged by two deprotonated phenyl hydroxyl oxygen atoms and iso-orthogonalized by a nitrato group in η1η1-O,O′ coordination fashion. Variable-temperature solid-state dc magnetization studies have been performed in the temperature range 2-300 K for compounds 1 and 3. Antiferromagnetic interactions were determined for 1 and ferromagnetic couplings were found for 3. |
| Keywords: | Tetranuclear clusters Mixed-valence Coordination mode Binuclear complex Magnetic properties |
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