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Anion effects on construction of Zn compounds with a chelating ligand bis(2-pyridylmethyl)amine and their catalytic activities |
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| Authors: | Youngmee Kim Geun Hee Eom Hyun Min Park Ho G. Jang Cheal Kim |
| Affiliation: | a Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, South Korea b Department of Fine Chemistry, Eco-Product and Materials Education Center, Seoul National University of Science and Technology, Seoul 139-743, South Korea c Department of Chemistry, Korea University, Seoul 136-701, South Korea |
| Abstract: | Three ZnII complexes containing bispicam ligands (bispicam = bis(2-pyridylmethyl)amine), [Zn(bispicam)2](NO3)2·2CH3OH 4A, [Zn(bispicam)(NO3)2] 4B, and [Zn(bispicam)2](OTf)26, were obtained, and their structures were determined by X-ray crystallography. Complexes of the general formulation [Zn(bispicam)2]X2 (X = Cl− (1), Br− (2), I− (3), NO3− (4A), ClO4− (5), and OTf− (6)) show fac geometric isomers (a) or enantiomers (c) and (d) according to anions. Moreover, complexes 4-6 could carry out the catalytic transesterification of a range of esters with methanol under the mild conditions. Importantly, the catalyst 4B with an unsaturated structure has shown better efficiency than the catalysts, 4A, 5, and 6, having saturated structures. To explain this reactivity difference, two different reaction mechanisms have been proposed (metal-based vs. amide N-H-based). |
| Keywords: | Geometric isomers Zinc(II) complexes Bis(2-pyridylmethyl)amine Transesterification Catalyst |
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