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

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)60-65
頁數6
期刊Polyhedron
37
發行號1
DOIs
出版狀態Published - 23 四月 2012

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