Structures
Hydrated rhodium trichloride usually refers to compound with the approximate formula RhCl3(H2O)3. 103Rh NMR spectroscopy shows that solutions of this material consist of several species, the proportions of which change with time and depend on the concentration of chloride. The relative distribution of these species determines the colour of the solutions, which can range from yellow (the hexaaquo ion) to "raspberry-red." Some of these species are 3+, 2+, cis- and trans-+, and . Individual ions have been separated by ion exchange chromatography.
Anhydrous rhodium chloride crystallises with a monoclinic crystal structure, same as in YCl3 or AlCl3. It is a dense brown solid that is insoluble in common solvents and of little value in the laboratory.
Read more about this topic: Rhodium(III) Chloride
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