Abstract
Two isomers of each of α-P4S2SeI2 and α-P4SSe2I2 have been identified by 31P and 77Se NMR spectroscopy in mixtures made by direct combination of the elements. The same compounds were formed as a result of a photochemical redistribution reaction between α-P4S3I2 and α-P4Se3I2 in solution in CS2. Systematic changes in chemical shifts and in coupling constants with alterations in molecular geometry, as sulfur was replaced by selenium in the series α-P4S3I21–α-P4S2SeI22,3–α-P4SSe2I24,5–α-P4Se3I26, are reported.
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