Gusev, A. N., Shulgin, V. F., Linert, W., Hasegawa, M., Aleksandrov, G. G., & Eremenko, I. L. (2014). Adducts of lanthanide acetylacetonates with 5-phenyl-2-(2-pyridyl)-7,8-benzo-6,5-dihydro-1,3,6-triazaindolizine: structure and photoluminescence. Russian Chemical Bulletin, 63(7), 1493–1497. https://doi.org/10.1007/s11172-014-0625-4
A series of isostructural complexes of the formula Ln(acac)3L (where Hacac is the acetyl- acetone, L is the 5-phenyl-2-(2-pyridyl)-7,8-benzo-6,5-dihydro-1,3,6-triazaindolizine, Ln are the LaIII, TbIII, EuIII, and SmIII) was studied. Molecular and crystal structures of terbium and samarium complexes were established by X-ray diffraction analysis. Luminescence properties of solid samples were studied. Coordination of 5-phenyl-2-(2-pyridyl)-7,8-benzo-6,5-dihydro- 1,3,6-triazaindolizine as an additional ligand increases intensity of photoluminescence. Lumi- nescence spectra of compositions EuxTb1-x(acac)3L and La0.6Eu0.1Tb0.3(acac)3L were studied. A combination of several lanthanide ions allowed us to obtain almost white emission.