TY - JOUR
T1 - Tetranuclear mixed-valence Co(II/III) and binuclear Ni(II) complexes incorporating hydroxyl-rich ligand
T2 - Syntheses, structures and magnetic properties
AU - Zhang, Su Yun
AU - Xu, Bin
AU - Zheng, Lina
AU - Chen, Wenqian
AU - Li, Yahong
AU - Li, Wu
N1 - Funding Information:
The authors appreciate the financial support from the Hundreds of Talents Program ( 2005012 ) of CAS, Natural Science Foundation of China ( 20872105 ), ‘Qinglan Project’ of Jiangsu Province ( Bu109805 ) and Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education of Lanzhou University ( LZUMMM2010003 ). The authors thank Professors Song Gao and Chengyong Su for magnetic measurement assistance and Dr. James Ciszewski for helpful discussion.
PY - 2011/2/28
Y1 - 2011/2/28
N2 - Three complexes of composition [Co2IICo 2III(H2hbhpd)2(H4hbhpd) 2(H2O)2]Cl2(CH3OH) 4 (1), [Co2IICo2 III(H2hbhpd)2(H4hbhpd) 2(H2O)2](NO3)2(CH 3OH)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 η1η 1-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.
AB - Three complexes of composition [Co2IICo 2III(H2hbhpd)2(H4hbhpd) 2(H2O)2]Cl2(CH3OH) 4 (1), [Co2IICo2 III(H2hbhpd)2(H4hbhpd) 2(H2O)2](NO3)2(CH 3OH)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 η1η 1-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.
KW - Binuclear complex
KW - Coordination mode
KW - Magnetic properties
KW - Mixed-valence
KW - Tetranuclear clusters
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U2 - 10.1016/j.ica.2010.11.038
DO - 10.1016/j.ica.2010.11.038
M3 - Article
AN - SCOPUS:79551690291
VL - 367
SP - 44
EP - 50
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
IS - 1
ER -