Abstract
Three dinuclear isophthalato-bridged nickel(II) complexes formulated as [Ni(rac-L)]2(μ-IPA)(ClO4)2 (1), [Ni(RR-L)]2(μ-IPA)(ClO4)2 (2) and [Ni(SS-L)]2(μ-IPA)(ClO4)2 (3) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyc-lotetradecane, IPA = isophthalic acid) have been isolated and characterized. Single crystal X-ray diffraction analyses revealed that the Ni(II) atoms have six-coordinated distorted octahedral environments, and the isophthalato ligand bridges two Ni(II) centres in a bis bidentate fashion to form dimers in all three complexes. The monomers of {[Ni(SS-L)]2(μ-IPA)} 2+ are connected through intermolecular hydrogen bonds to generate one-dimensional left-handed helical chains in complex 3. The homochiral natures of complexes 2and3have been confirmed by CD spectroscopy.
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Acknowledgements
This work was supported by the Scientific Research Fund of Hunan Provincial Education Department (13B029, 13A030), the Key Laboratory of Functional Organometallic Materials of Hunan Province College (13K09, 13K10), the Program for Excellent Talents in Hunan University of Science and Engineering (2013), 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).
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Crystallographic data for 1, 2 and 3 have been deposited with the Cambridge Crystallographic Data Centre as supplemental publication numbers CCDC 989829, 989830 and 989831, respectively. Copies of the data can be obtained free of charge via http://www.ccdc.cam.ac.uk.
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OU, GC., LI, ZZ., YUAN, L. et al. Synthesis and crystal structures of three isophthalato-bridged macrocyclic nickel(II) complexes. J Chem Sci 127, 115–122 (2015). https://doi.org/10.1007/s12039-014-0755-0
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DOI: https://doi.org/10.1007/s12039-014-0755-0