1372138-46-9Relevant articles and documents
Steric-influenced fluxionality in monomeric two and three coordinate copper(I) complexes with a trans-chelating bis-pyrazole ligand
Chou, Chang-Chuan,Liu, Hsueh-Ju,Chao, Lucas Hung-Chieh,Syu, Hong-Bin,Kuo, Ting-Shen
, p. 60 - 65 (2012/06/15)
Two new trans-chelating bispyrazolyl ligands, LH, where L H = 1,3-bis-(3,5-dimethyl-pyrazol-1-ylmethyl)-2,3-dihydro-1H- perimidine, and LCHPh2, where LCHPh2=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(LH)](ClO4) (3·ClO4), [Cu(LCHPh2)](ClO4) (4·ClO4), and [Cu(LH)I] (5) were prepared and structurally characterized by X-ray crystallography. The variable-temperature 1H NMR spectra showed that complex 4·ClO4 is rigid, whereas complexes 3·ClO4 and 5 are nonrigid in CH 2Cl2 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(LPh)I] (2) and dynamic two coordinate copper(I) complex [Cu(LPh)](ClO4) (1·ClO4) found previously [17]. To the best of our knowledge, complex 5 represents the first example of a dynamic monomeric three coordinate copper(I) complex.