Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of Zinc(II) Tetraaza Macrocyclic Complexes with Aquo and Nitrate Ligands

  • Lim, In-Taek (Department of Chemistry Education, Kongju National University) ;
  • Kim, Chong-Hyeak (Center for Chemical Analysis, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Choi, Yoon-Mi (Center for Chemical Analysis, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Park, Jong-Hoon (Department of Chemistry Education, Kongju National University) ;
  • Choi, Ki-Young (Department of Chemistry Education, Kongju National University)
  • Received : 2017.11.16
  • Accepted : 2017.12.26
  • Published : 2018.02.20
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Abstract

The complexes $[Zn(L)(H_2O)_2]{\cdot}2NO_2$ (1) and $[Zn(L)(NO_3)_2]$ (2) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo $[14,4,0^{1.18},0^{7.12}]$docosane) have been synthesized and structurally characterized. The compound 1 crystallizes in the monoclinic system $P2_1/c$ with a = 8.74650(10), b = 18.6880(3), c = $7.96680(10){\AA}$, ${\beta}=109.1920(10)^{\circ}$, $V=1229.84(3){\AA}^3$, Z = 2. The compound 2 crystallizes in the monoclinic system P1 with a = 8.1292(5), b = 8.9244(5), c = $9.1398(5){\AA}$, ${\alpha}=68.035(2)$, ${\beta}=70.109(2)$, ${\gamma}=75.649(3)^{\circ}$, $V=572.70(6){\AA}^3$, Z = 1. The crystal structures of the compounds 1 and 2 show a distorted octahedral coordination geometry around the zinc(II) ion, with four secondary amines and two oxygen atoms of the two water and two nitrate ligands at the axial position. The TGA behaviors of the complexes are significantly affected by the nature of the tetraaza macrocycle and the axial ligands.

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References

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