Peculiarities of the Complexation of Copper and Silver Adducts of a 3,5-Bis(trifluoromethyl)pyrazolate Ligand with Organoiron Compounds

Interaction of the copper, {[3,5-(CF3)2Pz]Cu}3, and silver, {[3,5-(CF3)2Pz]Ag}3, macrocycles [3,5-(CF3)2Pz = 3,5-bis(trifluoromethyl)pyrazolate] with cyclooctatetraeneiron tricarbonyl, (cot)Fe(CO)3, was investigated by IR and NMR spectroscopy for the first time. The formation of 1:1 complexes was observed at low temperatures in hexane. The composition of the complexes (1:1) and their thermodynamic characteristics in hexane and dichloromethane were determined. The π-electron system of (cot)Fe(CO)3 was proven to be the sole site of coordination in solution and in the solid state. However, according to the single-crystal X-ray data, the complex has a different (2:1) composition featuring the sandwich structure. The complexes of ferrocene with copper and silver macrocycles have a columnar structure (X-ray data).