Inorganic Chemistry, Vol.39, No.10, 2206-2211, 2000
On the nature of the trigonal fields in hexaaquachromium(III) in guanidinium aluminum sulfate hexahydrate
Zeeman and site selective luminescence and excitation spectra in the region of the E-2 <-- (4)A(2) transition are reported for the hexaaquachromium(III) complex in the trigonal ferroelectric guanidinium aluminum sulfate hexahydrate, The two prominent transitions are due to the R-1 lines of the two sites of C-3 and C-3v point symmetry. The two R-1 lines display g(parallel to) = -3.1 and g(parallel to) = -3.2, respectively, and show no measurable Zeeman shift or splitting with B perpendicular to c, This behavior is consistent with the presence of a very large trigonal field. A peculiar feature of the present system is the conspicuous absence of any prominent R-2 line. From the Zeeman data with B perpendicular to c and a comparison of vibrational sidelines in excitation and luminescence it is concluded that the R-2 level strongly interacts with vibrational levels.
Keywords:CESIUM TITANIUM ALUM;PARAMAGNETISM