EPR Study of the Low-Spin d3; S =1/2 Jahn-Teller-Active Dinitrogen Complex of a Molybdenum Trisamidoamine

摘要

The first EPR study of the trisamidoamine complex, [>Mo]N2, where [>Mo] = [Mo(III)[HIPTN3N]^3- = [3,5-(2,4,6-i-Pr3-C6H2)2C6H3NCH2CH2]3N^3-], reveals that this low-spin (S = ½) [d³] complex exhibits a ²E state that undergoes a pseudo Jahn-Teller distortion in the adiabatic limit, modified by interactions with the solvent, and gives approximate values of interaction energies. The experiments establish that [>Mo]N2 exhibits the low-spin [e³] electronic configuration, not [a²e¹], with the a(z²) antibonding orbital substantially higher in energy than the e[xz, yz] orbitals.