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Chiral resolution of l- and d-alanine and a racemic macrocyclic nickel(II) complex: synthesis and crystal structures

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Abstract

The reactions of a racemic four-coordinate Ni(II) complex [Ni(rac-L)](ClO4)2 with l- and d-alanine in acetonitrile/water gave two six-coordinate enantiomers formulated as [Ni(RR-L)(l-Ala)](ClO4)·2CH3CN (1) and [Ni(SS-L)(d-Ala)](ClO4) (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclo-tetradecane, Ala = alanine anion), respectively. Evaporation from the remaining solutions gave two four-coordinate enantiomers characterized as [Ni(SS-L)](ClO4)2 (S-3) and [Ni(RR-L)](ClO4)2 (R-3), respectively. Single-crystal X-ray diffraction analyses of complexes 1 and 2 revealed that the Ni(II) atom has a distorted octahedral coordination geometry, being coordinated by four nitrogen atoms of L in a folded configuration, plus one carboxylate oxygen atom and one nitrogen atom of l- or d-Ala in mutually cis-positions. Complexes 1 and 2 are supramolecular stereoisomers, constructed via hydrogen bonding between [Ni(RR-L)(l-Ala)]+ or [Ni(SS-L)(d-Ala)]+ monomers to form 1D hydrogen-bonded zigzag chains. The homochiral natures of complexes 1 and 2 have been confirmed by CD spectroscopy.

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Acknowledgments

This work was supported by the Scientific Research Fund of Hunan Provincial Education Department (13B029, 13A030, 13CY029), the Program for Excellent Talents in Hunan University of Science and Engineering, the Construct Program of the Key Discipline in Hunan Province (2011-76), the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province (2012-318) and NSF of Hunan (11JJ2009).

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Correspondence to Guang-Chuan Ou.

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Ou, GC., Li, ZZ., Zhang, M. et al. Chiral resolution of l- and d-alanine and a racemic macrocyclic nickel(II) complex: synthesis and crystal structures. Transition Met Chem 39, 135–140 (2014). https://doi.org/10.1007/s11243-013-9782-9

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  • DOI: https://doi.org/10.1007/s11243-013-9782-9

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