The cations of 3d metals in water and alcohol create aqueous complexes, with the creation and stability of the aqua cations are of particular importance. The number of water molecules connected with the metal by direct metal-oxygen bonds determines the properties of the complex. The traditional measurements of, for example, ions mobility, ostensible radii of the hydration ions and the entropy of hydration, do not yield detailed information for the aqua ions, which is why studies of their spectral properties becomes necessary. These properties depend on the composition and the symmetry of the surrounding medium. In this work, the absorption of the complexes [Co(H2O)6]2+ and [Co+Ni(H2O)6]2+ were measured in the spectral region 395 – 600 nm. The energies of the electron transitions in Co2+ were calculated and the role of the spin-orbit coupling was evaluated. The calculated and experimental Lorentz profiles of the complexes investigated are also presented.
Bismuth germanate Bi4Ge3O12 (BGO) single crystals doped with ruthenium, manganese and ruthenium plus manganese are grown by Czohralski technique with automatically diameter-weight control method. The effect of doping on the
light-induced, magneto-optical and holographic properties of BGO single crystals is studied. It was found that the optical transmission spectrum of doped samples is modified strongly under thermal annealing and homogeneous illumination with UV light as well as the photochromic effect is fully reversible. The magneto-optical rotation was measured and Verdet constant was calculated at visible spectral range. Holographic grating are successfully recorded at 633 nm.