New sandwich complexes of praseodymium(iii) containing triazacyclohexane ligands

Abstract

N-substituted 1,3,5-triazacyclohexanes (R₃TAC) react with praseodymium trifluoromethane sulfonates [Pr(OTf)₃] to give the corresponding complexes, containing one or two R₃TAC ring(s) coordinated to praseodymium, depending on R. The crystal and molecular structures of these compounds have been determined by X-ray diffraction. The complex containing two coordinated R₃TAC is mononuclear, while the complex containing one R₃TAC is dinuclear with three triflate bridges. NMR diffusion studies indicate that these structures also occur in benzene solution.