General Aspects of Selenium and Tellurium Compounds

Representative physical constants of selenium and tellurium are listed in 

To determine the structures of selenium and tellurium compounds, it is convenient to know natural abundance ratios of their isotopes. For selenium, for example, °Se and Se are present in the ratio of 2 1, and this is indicative of the characteristic features of selenium compounds in mass spectra (i.e. monoselenides, M M -2 = 2 1 diselenides, M M -2 = 1 1). Furthermore, satellites based on fhe NMR-active Se nuclei are helpful for assignment of carbon signals adjacent to Se in NMR. 

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