Luminescence spectroscopy and crystal field simulations of europium propylenediphosphonate EuH[O3P(CH2)(3)PO3] and europium glutarate [Eu(H2O)](2)[O2C(CH2)(3)CO2](3)center dot 4H(2)O

The results of investigations on the photoluminescence of two europium hybr id compounds, EuH[O3P(CH2)(3)PO3] (Eu[diph]) and [Eu(H2O)](2)[O2C(CH2)(3)CO 2](3) . 4H(2)O (Eu[glut]), are presented. In both compounds one local envir onment is found for the rare earth (Re) ion and the symmetry of the Re poly hedron is low (C-s) as evidenced by the Eu3+ luminescence studies. The elec trostatic crystal field (cf) parameters of the F-7 multiplet are obtained b y the application of the phenomenological cf theory; The simulations using C-2v symmetry for the rare earth ion give good agreement between the calcul ated and the experimental F-7(0-4) energy level schemes. The observed optic al data are discussed in relation to the crystal structure of the compounds . (C) 1999 Academic Press.