AbstractCrystals of EuPO4, EuAsO4, and EuSbO4 were grown by chemical vapor transport. These compounds exhibit complex anions and they crystallize in different structures. The modelling of the chemical transport experiment was carried out with the program TRAGMIN. By means of different spectroscopic methods structural and electronic influences of the complex anion on the electronic state of the europium ion were investigated. These results were in good agreement with calculations of the electronic structure. The magnetic susceptibility shows the typical van Vleck paramagnetism of trivalent europium. The specific heat capacity was determined in the range from 1.9 to 320 K. The conformity of these results was checked on the basis of specific heat determination through differential scanning calorimetry (DSC) in the temperature range 235 to 473 K. The optical bandgaps, received from UV/Vis spectroscopy are in good agreement with calculated ones.