Manifestation of different types of coordination tungsten polyhedrons in vibrafional spectra of LnWO4Cl and La3WO6Cl3, activated by europium

Dependence of specific features of vibrational spectra of centrally symmetric chlorotungstates GdWO4Cl, LaWO4Cl, La3WO6Cl3 activized by Eu3+ ions on the character of tungsten coordination, when its coordination number increases from four to six sequentially, is studied. The influence of the fifth atom of oxygen on tetrapedric anion vibration depends on the strength of its bond with tungsten and can be pronounced in the decrease in the frequency of stretching vibrations. Broadening of bands in electron-vibrational in (EV) spectra of Eu3+ and decrease in the degree of EN and Raman spectra conformity as regards certain compounds: GdWO4Cl, LaWO4Cl, La3WO6Cl3 reflect the decrease in the degree of molecular anion isolation