The vibrational spectra of some 1,2,4-trioxanes present two characteristic bands at 790 and 880 cm-'. On the basis of "0-isotopic substitution and comparison with analogous compounds, these bands have been assigned to coupled C-0 and 0-0 stretching modes of the C-0-0 element.
Single crystals of MoO3 have been grown under an oxygen atmosphere using a horizontal tubular furnace. The temperature and pressure necessary to grow satisfactory crystals in oxygen along [100] and [010] directions are determined
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