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Copper(I) Complexes of Naphthyl‐Substituted Fluorinated Trispyrazolylborate Ligands with Ethene and Carbon Monoxide
Author(s) -
van Dijkman Thomas F.,
Siegler Maxime A.,
Bouwman Elisabeth
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600015
Subject(s) - chemistry , trifluoromethyl , carbon monoxide , octahedron , acetone , ligand (biochemistry) , copper , bridging ligand , crystallography , medicinal chemistry , inorganic chemistry , boron , nuclear magnetic resonance spectroscopy , crystal structure , stereochemistry , catalysis , organic chemistry , biochemistry , alkyl , receptor
Four Cu I complexes of the two new hydridotrispyrazolylborate ligands hydridotris[3‐trifluoromethyl‐5‐(1‐naphthyl)pyrazol‐1‐yl]borate (= [Tp CF3,1Nt ] – ) and hydridotris[3‐trifluoromethyl‐5‐(2‐naphthyl)pyrazol‐1‐yl]borate (= [Tp CF3,2Nt ] – ) 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 [Na 2 (Tp CF3,1Nt ) 2 (µ‐acetone) 2 ], [Cu(Tp CF3,1Nt )(C 2 H 4 )] and [Cu(Tp CF3,2Nt )(C 2 H 4 )]. The Cu I ions are in approximate tetrahedral geometries comprising the three nitrogen donors of the tridentate ligand and the η 2 ‐coordinated ethene ligands. The sodium ion in [Na 2 (Tp CF3,1Nt ) 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 –CF 3 group with a particularly short Na ··· F distance. The chemical shifts of the ethene ligands in [Cu(Tp CF3,1Nt )(C 2 H 4 )] and [Cu(Tp CF3,2Nt )(C 2 H 4 )] are 5.00 ppm and 4.96 ppm respectively on 1 H‐NMR and 85.9 ppm and 85.8 ppm on 13 C‐NMR spectroscopy. The CO stretching frequencies in the IR spectra of [Cu(Tp CF3,1Nt )(CO)] and [Cu(Tp CF3,2Nt )(CO)] are found at 2103 and 2109 cm –1 , respectively.