
%0 Journal Article
%A Collin, Jean-Paul 
%A Gaviña, Pablo 
%A Sauvage, Jean-Pierre 
%A Cian, André De 
%A Fischer, Jean 
%T Synthesis and Structural Characterization of Copper(I) and Copper(II) Complexes with an Ambivalent Phenanthroline-Type Ligand
%J Australian Journal of Chemistry
%D 1997/12/15
%V 50
%N 10
%P 951-958
%K 
%R https://doi.org/10.1071/C97106
%U https://www.publish.csiro.au/paper/C97106 
%X The new phenanthroline ligand 2-(p-methoxyphenyl)-9-(5&#8242;-methylpyridin-2&#8242;-yl)-1,10-phenanthroline L has been synthesized and shown to form four-coordinate CuI(L)2 (1) and six-coordinate CuII(L)2 (2) complexes. Their structures have been determined by X-ray crystallography: (1) C50H38CuN6O2.BF4, triclinic, space group P -1, a12&#183;924(3), b 14&#183;567(4), c 12&#183;649(3) &#197; , &#945; 105&#183;57(2), &#946; 107&#183;68(2), &#947; 104&#183;00(2)&#176;; (2) C50H38CuN6O2.2PF6, monoclinic, space group P 21/c, a 17&#183;701(5), b 19&#183;285(5), c 14&#183;93(4) &#197;, &#946; 98&#183;20(2)&#176;. In solution, cyclic voltammetry measurements indicate for the copper(I) and copper(II) complexes a very fast rearrangement of the pyridine substituent with the change of the oxidation state. Surprisingly, the X-ray data show two different coordination modes for the ligand around the copper(I) ion, the 1,10-phenanthroline nucleus being either mono- or bi-dentate. In solution, since the 1H n.m.r. spectra obtained even at several temperatures display only one set of signals, it is proposed that a fast equilibrium takes place between two coordination modes of the phenanthroline 
