Silver(I) and Copper(I) Adducts of a Tris(pyrazolyl)borate Decorated with Nine Trifluoromethyl Groups

Silver and copper ethylene adducts and the silver carbonyl complex of the tris­(pyrazolyl)­borate [HB­(3,4,5-(CF3)3Pz)3]− (which is based on one of the most acidic pyrazoles known) have been synthesized. 13C NMR resonance signals of metal-bound ethylene carbon atoms of [HB­(3,4,5-(CF3)3Pz)3]­Ag­(C2H4) and [HB­(3,4,5-(CF3)3Pz)3]­Cu­(C2H4) appear at δ 111.6 and 94.9, respectively. The CO stretching frequency of the silver adduct [HB­(3,4,5-(CF3)3Pz)3]­Ag­(CO) is significantly higher than that of free CO, but it appears at a region less sensitive to the ligand electronic effects of tris­(azolyl)­borate silver adducts.