Steric-influenced fluxionality in monomeric two and three coordinate copper(I) complexes with a trans-chelating bis-pyrazole ligand

Chang Chuan Chou*, Hsuch-Ju Liu, Lucas Hung Chieh Chao, Hong Bin Syu, Ting Shen Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Two new trans-chelating bispyrazolyl ligands, L H, where L H = 1,3-bis-(3,5-dimethyl-pyrazol-1-ylmethyl)-2,3-dihydro-1H- perimidine, and LCHPh 2, where LCHPh 2=2-benzhydryl-1,3-bis- (3,5-dimethyl-pyrazol-1-ylmethyl)-2,3-dihydro-1H-perimidine, and their two and three coordinate copper(I) derivatives [Cu(L H)](ClO 4) (3·ClO 4), [Cu(LCHPh 2)](ClO 4) (4·ClO 4), and [Cu(L H)I] (5) were prepared and structurally characterized by X-ray crystallography. The variable-temperature 1H NMR spectra showed that complex 4·ClO 4 is rigid, whereas complexes 3·ClO 4 and 5 are nonrigid in CH 2Cl 2 solution. This suggests that the steric bulk of the 2-substituents in the dihydroperimidine moiety could impart some steric effects upon the fluxional behavior of individual two and three coordinate copper(I)-pyrazole complexes, in comparison with the rigid three coordinate copper(I) complex [Cu(L Ph)I] (2) and dynamic two coordinate copper(I) complex [Cu(L Ph)](ClO 4) (1·ClO 4) found previously [17]. To the best of our knowledge, complex 5 represents the first example of a dynamic monomeric three coordinate copper(I) complex.

Original languageEnglish
Pages (from-to)60-65
Number of pages6
JournalPolyhedron
Volume37
Issue number1
DOIs
StatePublished - 23 Apr 2012

Keywords

  • Copper(I)
  • Fluxionality
  • Steric effect
  • Three coordinate
  • Trans-chelating ligand
  • Two coordinate

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