Schwingungsspektroskopische Untersuchungen an festen Hydraten : MIR/FIR-Spektroskopie, Raman-Spektroskopie, NIR-Spektroskopie

The doctoral thesis presented is about the preparation and MIR/FIR and Raman spectroscopic studies of polycrystalline and single-crystalline solid hydrates, the determination of the strength of the hydrogen bonds and the investigation of the phonon modes of spinel-type sulfide solid solutions. Single-crystal Raman spectra of NiH 3 IO 6 ⋅6H 2 O and Ni(IO 3 ) 2 ⋅2H 2 O are presented and discussed with respect to the strength of the hydrogen bonds and the extent of intramolecular coupling of the internal vibrations of the periodate and the iodate ions. With the aid of the “oriented-gasâ -model, the theoretical raman intensities of the uncoupled OD modes of matrix isolated HDO molecules and the intramolecular coupled modes of the H 2 O molecules, and of the periodate and iodate ions were calculated. In collaboration with the group of Professor Trettin (university of Siegen/Mainz) detailed vibrational analyses, including isotopically diluted and enriched polycrystalline samples, of the compounds α-hopeite (α-Zn 3 (PO 4 ) 2 ⋅4H 2 O) and phosphophyllite (Zn 2 Fe(PO 4 ) 2 ⋅4H 2 O) have been performed. The Raman spectra of the system CoS-Cr 2 S 3 -In 2 S 3 have been compared with the far infrared reflection and absorption spectra with respect to the behaviour of the phonon modes (one-modeor two-mode-behaviour) on going from normal spinel (CoCr 2 S 4 ) to an inverse one (CoIn 2 S 4 ). A Raman spectroscopic study of polycrystalline samples of the ternary deuterid Cs 3-x RuD 7-x have been performed, in collaboration with the group of Professor Bronger (RWTH Aachen).