Gadolinium(III) cryptates investigated by multifrequency EPR

EPR studies of Gd(III) with the hexa(diphenylphosphinoxide)-cyclotriphosphazene ligand, PNP, can provide information about local environment of the Gd(III) ion. Furthermore, analysis of the EPR spectra of the Gd(III) PNP complex, carried out at X- and W-band (9.4 and 94 GHz) frequencies, provided information on the phase transition near 5.4 K as well as information on the time durability of the Gd/PNP complexes in the SiO2 xerogel matrix.