Construction of crystal structures of metal(II)-benzoates (M = Mn, Ni, Co, Cu, Zn, and Cd) and 1,2-bis(4-pyridyl)ethane: Effects of metal coordination modes and their catalytic activities |
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| Authors: | Soo Hyun Kim Young Joo Song Hyo Geun Koo Jung In Poong Cheal Kim Sung-Jin Kim Youngmee Kim |
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| Institution: | a Department of Fine Chemistry, and Eco-Product and Materials Education Center, Seoul National University of Technology, Seoul 139-743, Republic of Korea
b Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea |
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| Abstract: | Five polymeric metal(II)-benzoate complexes of formula Mn(O2CPh)2(CH3OH)2(bpa)]n (1-Mn), Co(O2CPh)2(H2O)(bpa)1.5]n (2-Co), Ni(O2CPh)2(H2O)(bpa)1.5]n (3-Ni), Cu(O2CPh)2(CH3OH)2(bpa)]n (4-Cu), and Cd(O2CPh)2(bpa)1.5]n (6-Cd) have been synthesized and characterized (bpa = 1,2-bis(4-pyridyl)ethane). They showed two kinds of structures: parallelogram-like two-dimensional sheets for Co, Ni, and Cd, and one-dimensional chains for Mn, Cu, and Zn. Since similar structures provide similar coordination geometries, the structures depend on the coordination geometries of metal ions. The compounds 1-Mn, 2-Co, 4-Cu, 5-Zn, and 6-Cd have catalyzed efficiently the transesterification of a variety of esters, while 3-Ni has displayed a very slow conversion. The reactivity of catalyst 6-Cd containing Cd ion, well known as an inert metal ion for the ligand substitution, was found to be comparable to that of 5-Zn. The reactivities of the compounds used in this study are in the order of 5-Zn > 6-Cd > 1-Mn > 4-Cu > 2-Co ? 3-Ni, indicating that the non-redox metal-containing compounds (5-Zn and 6-Cd) show better activity than the redox-active metal-containing compounds (1-Mn, 4-Cu, 2-Co, and 3-Ni). |
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| Keywords: | Coordination polymers Metal-benzoates Metal coordination modes Transesterification Catalytic activities |
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