Steric effect on construction of extended architectures of Ni(II) complexes directed by intermolecular C-H···F and C-H···O interactions

H. Kwak, G. H. Eom, S. H. Lee, H. G. Koo, S. P. Jang, J. Lee, W. Shin, M. S. Lah, C. Kim, S. J. Kim, Y. Kim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Five new Ni(II) complexes with pyridine carboxamide ligands have been synthesized and the crystal structures of three of the complexes were determined. Strong distortion effects of 6-methyl substitution were observed in the complexes with 6-methyl-substituted pyridyl bpb ligands. The C-H···F and C-H···O hydrogen bond interactions build extended architectures in the crystals studied. This result suggests that the steric effect of 6-methyl substitution plays an important role in the distortion of the structure, and the 6-methyl substitution can facilitate hydrogen bond interactions between methyl hydrogen atoms and O(carbonyl) or F atoms. Twelve Ni(II) complexes, including seven complexes reported previously, show reversible redox behavior, implying that the reduced Ni(I) state of each complex is stable in the time scale of CV measurement. The steric effect of R1 substituent and the electronic effects of X1 and X2 groups were found to be the main factors contributing to the shift of the redox potential of the Ni(II) complexes

Original languageEnglish
Pages (from-to)923-930
Number of pages8
JournalJournal of Structural Chemistry
Issue number5
StatePublished - Oct 2010

Bibliographical note

Funding Information:
Financial support from Korea Ministry Environment “ET-Human resource development Project,” the Korean Science&Engineering Foundation (R01-2008-000-20704-0 and 2009-0074066), the Converging Research Center Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0082832), and the SRC program of the Korea Science and Engineering Foundation (KOSEF) through the Center for Intelligent Nano-Bio Materials at Ewha Womans University (grant R11-2005-008-00000-0) is gratefully acknowledged.


  • Pyridine carboxamide
  • crystal structure
  • cyclic voltammetry
  • electronic effect
  • hydrogen bond
  • nickel(II) complex
  • supramolecular architecture
  • weak interactions


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