Syntheses of Highly Fluorinated 1,3,5-Triazapentadienyl Ligands and Their Use in the Isolation of Copper(I)−Carbonyl and Copper(I)−Ethylene Complexes

Fully fluorinated triazapentadienyl ligand [N{(C3F7)C(C6F5)N}2]-
and the related [N{(C3F7)C(2-F,6-(CF3)C6H3)N}2]- have been
synthesized in good yield via a convenient route and used in the
isolation of three- and four-coordinate copper(I)−carbon monoxide
complexes. They show fairly high νCO values (>2100 cm-1),
indicating the presence of electron-poor Cu sites. The copper(I)−ethylene adduct [N{(C3F7)C(C6F5)N}2]Cu(C2H4), featuring a three-coordinate Cu site, has also been synthesized using [N{(C3F7)C(C6F5)N}2]CuNCCH3 and C2H4.