450342-29-7Relevant academic research and scientific papers
Steric effects on the stereochemistry of copper complexes of 2,6-bis(pyrazol-1-ylmethyl)pyridines
Foster, Caroline L,Kilner, Colin A,Thornton-Pett, Mark,Halcrow, Malcolm A
, p. 1031 - 1041 (2002)
The stereochemical preferences of copper complexes of 2,6-bis-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L1Me2) and of 2,6-bis-(phenylpyrazol-1-ylmethyl)pyridine (L1Ph) have been investigated. The single crystal X-ray structures of [Cu(OH2)(L1Me2)](BF4)2 and [CuCl(HOMe)(L1Me2)]BF4 show near-regular tetragonal geometries with one or two axial solvent and/or BF4- ligands. In contrast, [Cu(OH2)2(L1Ph)](BF4)2 adopts an irregular geometry in the crystal mid-way between square-pyramidal and trigonal-bipyramidal. The single crystal X-ray structure of [Cu(NCMe)(L1Me2)]BF4 exhibits a distorted tetrahedral geometries, while [Cu(L1Ph)]BF4 adopts a T-shaped stereochemistry. By a combination of UV-Vis, EPR and conductivity studies, the solution structures of [CuCl2(L)], [CuCl(solv)(L)]BF4 and [Cu(solv)x(L)](BF4)2 (L = L1Me2, L1Ph; solv = H2O, MeCN; x = 1, 2) have, in many cases, been shown to be the same as in the crystalline state. The cyclic voltammograms of [Cu(OH2)(L1Me2)](BF4)2 and [Cu(OH2)2(L1Ph)](BF4)2 in MeCN/0.1 M NBun4BF4 exhibit chemically reversible Cu(II/I) couples.
