Add time:07/24/2019         Source:sciencedirect.com

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)2 6, 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).

► [Zn(bispicam)2]X2 complexes (X = Cl−, Br−, I−, NO3−, ClO4−, and OTf−) have been obtained. ► They showed fac geometric isomers or enantiomers according to anions. Anion effects play very important roles for construction of crystal structures and geometrical isomerism. ► They could carry out the catalytic transesterification of a range of esters with methanol.

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