Angewandte Chemie International Edition · 1999 · 255 citations · 0 references
Natural SciencesChemistryMaterials ScienceMaterials ChemistrySpectroscopic AnalysisSpectroscopyAtomic SpectroscopyCrystal ChemistryInorganic SpectroscopyOptical SpectroscopyRaman SpectroscopyVibrational SpectroscopyCharge-transfer SpectroscopyCharge-transfer StatesCharge-transfer TransitionsRaman SpectraRaman Spectral InterpretationResonance Raman SpectroscopySpectroscopic IdentificationZeolites
Framework titanium atoms in titanium-substituted silicalite (TS-1) can be identified by UV resonance Raman spectroscopy since the associated Raman bands at 1125, 530, and 490 cm(-1) (see figure) are observed only when the charge transfer transition associated with the framework Ti atoms is excited by a UV laser. Thus, framework Ti atoms can be distinguished from nonframework Ti atoms and other defect sites. This method can be applicable to identifying transition metal atoms in the frameworks of other molecular sieves.