It was found that bands at 739, 963, and 1107 cm in the resonant Raman spectra are characteristics of framework penta-coordinated Nb -OH species, and that a band at 1336 cm in the UV Raman spectrum with excitation line at 320 nm is a sensitive detector for identifying extra-framework niobium species. The change of framework penta-coordinated Nb -OH species into Nb and NbO species due to dehydration was definitively confirmed based on UV resonance Raman and UV/Vis results.
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http://dx.doi.org/10.1002/cphc.201700873 | DOI Listing |
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