Structural and spectroscopic investigations of nine-coordinate redox active lanthanide complexes with a pincer O,N,O ligand

Abstract

Three ligand molecules coordinate under their anionic diamagnetic form; the complexes (Gd, Eu, Yb, Lu) can undergo reversible oxidations, affording radical species, as demonstrated by spectro-electrochemistry.

New NIR-luminescent lanthanide complexes with tridentate oxybenzophenanthroline ligands

“…Each of these oxidation events corresponds to the successive one-electron oxidation steps of the phenolate moieties to phenoxyl radicals (Scheme 4). 4,46–48…”

“…Each of these oxidation events corresponds to the successive one-electron oxidation steps of the phenolate moieties to phenoxyl radicals (Scheme 4). 4,[46][47][48] The electrochemical behavior of the three neutral complexes was also investigated in reduction. They all display a reversible monoelectronic reduction wave in the range from À2.03 to À2.05 V (Table 1).…”

Low-Coordinate Mixed Ligand NacNac Complexes of Rare Earth Metals

“…The development of coordination chemistry of redox-active ligands with rare earths is of undoubted interest from the point of view of both fundamental science and applied research. The combination of a rare earth element with organic ligands which have extended redox properties and several reduction states will make it possible to obtain compounds possessing a number of useful chemical properties [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ] as well as properties essential for the development of new magnetic materials [ 11 , 12 , 13 , 14 ]. In general, among such properties are the presence of different paramagnetic centers, several redox transitions, anisotropy of magnetic properties at the rare earth metal center, and modulating the magnetic behavior due to both the metal center and the organic redox-active ligand.…”

Monomethylation and -protonation of Lutetium Dinitrogen Complex

“…15 N NMR spectra were recorded with a Bruker Avance 600 MHz spectrometer operating at 61 MHz for 15 N and calibrated using an external reference neat liquid ammonia at 0 ppm. 11 B NMR spectrum was recorded with a Bruker Avance III 500 MHz NMR spectrometer with reference to BF3-etherate as an external standard. Magnetic moments were measured three times using the method originally described by Evans and experimental solutions containing a known amount of a TMSOTMS standard [1][2] .…”