Copper(I) Complexes of Naphthyl‐Substituted Fluorinated Trispyrazolylborate Ligands with Ethene and Carbon Monoxide

Abstract

Four CuI complexes of the two new hydridotrispyrazolylborate ligands hydridotris[3‐trifluoromethyl‐5‐(1‐naphthyl)pyrazol‐1‐yl]borate (= [TpCF3,1Nt]–) and hydridotris[3‐trifluoromethyl‐5‐(2‐naphthyl)pyrazol‐1‐yl]borate (= [TpCF3,2Nt]–) have been synthesized by reaction of the sodium salts of the ligands with CuI under either ethene or carbon monoxide atmosphere. Single crystal X‐ray diffraction analyses yielded the molecular structures of the three compounds [Na2(TpCF3,1Nt)2(µ‐acetone)2], [Cu(TpCF3,1Nt)(C2H4)] and [Cu(TpCF3,2Nt)(C2H4)]. The CuI ions are in approximate tetrahedral geometries comprising the three nitrogen donors of the tridentate ligand and the η2‐coordinated ethene ligands. The sodium ion in [Na2(TpCF3,1Nt)2(µ‐acetone)2] is found in a distorted octahedral coordination geometry formed by three N‐donors of the facially coordinating tridentate ligand, two O‐donors of bridging acetone ligands and a fluoride of a bridging –CF3 group with a particularly short Na···F distance. The chemical shifts of the ethene ligands in [Cu(TpCF3,1Nt)(C2H4)] and [Cu(TpCF3,2Nt)(C2H4)] are 5.00 ppm and 4.96 ppm respectively on 1H‐NMR and 85.9 ppm and 85.8 ppm on 13C‐NMR spectroscopy. The CO stretching frequencies in the IR spectra of [Cu(TpCF3,1Nt)(CO)] and [Cu(TpCF3,2Nt)(CO)] are found at 2103 and 2109 cm–1, respectively.