One-dimensional lanthanide chain bridged by nitronyl nitroxide radical ligand: structure and magnetic properties

In order to synthesize the molecular magnetic material, the complex{Nd(hfac)3(NIT-5MeThien)}n(NIT-5MeThien=2-(5-Methyl-2ˊ-thienyl)-5--4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide) has been synthesized by the reaction using radical ligand and Nd(hfac)3•2H2O. X-ray diffraction analysis showed that the compound belongs to the monoclinic system and constituted by Nd(hfac)3 and NIT-5MeThien to obtain a one-dimensional chain which nitroxide radical acted as a bridged ligand through the N-O groups. Variable temperature magnetization of complex was shown the antiferromagnetic interaction between Nd(III) ion and nitroxide radical.

A four-parameter system for rationalising the electronic properties of transition metal–radical ligand complexes

A heuristic four-parameter scheme captures and predicts the electronic properties of radical-ligand transition metal compounds, overcoming ligand specific descriptions.

[FeII(L•)2][TCNQF4•−]2: A Redox-Active Double Radical Salt

The reaction of [FeII(L•)2][BF4]2 with LiTCNQF4 results in the formation of [FeII(L•)2][TCNQF4•−]2·2CH3CN (1) (L• is the neutral aminoxyl radical ligand 4,4-dimethyl-2,2-di(2-pyridyl)oxazolidine-N-oxide; TCNQF4 is 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane). Single-crystal X-ray diffraction; Raman, Fourier-transform infrared (FTIR) and ultraviolet–visible spectroscopies; and electrochemical studies are all consistent with the presence of a low-spin FeII ion, the neutral radical form (L•) of the ligand, and the radical anion TCNQF4•−. 1 is largely diamagnetic and the electrochemistry shows five well-resolved, diffusion-controlled, reversible one-electron processes.

Molecular and electronic structure of the dithiooxalato radical ligand stabilised by rare earth coordination

Coordinating rare earth ions to bis(dithiooxalato)nickel produces the first structurally characterised complexes possessing the elusive dithiooxalato radical ligand.

Scrutinizing metal–ligand covalency and redox non-innocence via nitrogen K-edge X-ray absorption spectroscopy

A series of nitrogen K-edge XAS data obtained for coordination complexes of diverse transition metals is used to calibrate computational pre-edge peak energies and to afford estimates of metal–ligand covalencies. The approach is extended to probe an inner-sphere aminyl radical ligand.