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Preparation, characterization and crystal structures of metal(II) tetraza macrocyclic complexes with organic co-ligands

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Abstract

The complexes [Ni(L1)(pyc)2]·2H2O (1) (L1 = C-meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane; Hpyc = pyrazinecarboxylic acid) and [Cu(L2)(H-cpdc)] (2) (L2 = 3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,01.18,07.12]docosane; H2-cpdc = cyclopropanedicarboxylic acid) have been synthesized and structurally characterized. The crystal structure of complex 1 shows a distorted octahedral coordination geometry around the nickel(II) center, with four secondary amines in the equatorial positions and two nitrogen atoms of the pyc− ligands in the trans positions. In complex 2, the coordination environment around the copper(II) center is a Jahn–Teller distorted octahedron with four Cu–N bonds and two axial Cu–O bonds. The electronic spectra, electrochemical and TGA behavior of the complexes are significantly affected by the nature of the axial pyc− and H-cpdc− ligands.

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Authors and Affiliations

  1. Department of Chemistry Education, Kongju National University, Kongju, 32588, Korea

    In-Taek Lim, Jong-Hoon Park & Ki-Young Choi

  2. Center for Chemical Analysis, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-Ro, Yuseong-Gu, Daejeon, 34114, Korea

    Chong-Hyeak Kim & Yoon-Mi Choi

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  1. In-Taek Lim
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  2. Jong-Hoon Park
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  3. Ki-Young Choi
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  4. Chong-Hyeak Kim
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Correspondence to Ki-Young Choi.

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Lim, IT., Park, JH., Choi, KY. et al. Preparation, characterization and crystal structures of metal(II) tetraza macrocyclic complexes with organic co-ligands. Transit Met Chem 43, 323–330 (2018). https://doi.org/10.1007/s11243-018-0220-x

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