Electronic Spectra of Chevreul's Salts

Use of Cu2+ as a metal ion probe for the EPR study of metal complexation sites in the double sulfite CuI 2SO3.CdII SO3 .2H2O

“…As can be seen, the patterns of the substituted sulfite resemble those of Chevreul's salt with minor changes in "d" spacings. [5][6][7][8][9] The diamagnetic host ions possess a closed outer electronic shell, heightening the local symmetry of the host lattice. When Cu II replace diamagnetic Cu I and Cd II centers in such host lattices, local distortions take place because of the mismatch of the size of Cu II ions to that of host ions and in response to dynamic effects such as JahnTeller effects.…”

“…4 The former is in In such cases, the X-ray diffraction data were similar to those of Chevreul's salt (Figure 1), with minor changes in "d" spacings, forming an isomorphic series. [6][7][8][9] As a consequence, a gradual substitution of the Cu II ions by the transition metal ions is also possible, giving rise to a variety of mixed compositions. The isomorphic series has been found to have the general formula of Cu (M = Cu, Fe, Mn and Cd).…”

“…8 An additional intervalence-transfer band, which is responsible for the red color, is located at 500 nm. A solution containing 1.0 g of copper sulfate and 10.2 g of cadmium sulfate was saturated with sulfur dioxide gas at room temperature to produce a solution with a pH of approximately 1.…”

Isomorphic series of double sulfites of the Cu2SO3.MSO3.2H2O (M = Cu, Fe, Mn, and Cd) Type: a review

“…A more complete study was made by Silva et al, 42 involving the electronic interactions between the constituents of Chevreul's salt derivatives, particularly insofar as the types of electronic transition responsible for their different colors are concerned, with emphasis on the theoretical evaluation employing molecular modeling calculations. [43][44][45][46] The spectrum of Chevreul's salt and those of the corresponding derivatives with Fe(II), Mn(II) and Cd(II) ions are shown in Figure 5.…”

“…The electronic spectrum of Chevreul's salt consists of a charge-transfer band around 425 nm associated with the [Cu 6-chromophore, 42 and two ligand field transitions at 785 and 1000 nm involving the Jahn-Teller splitting of the Cu(II) levels, an effect that is associated with d 9 ions. An additional intervalence-transfer band, responsible for its red color, can be found at 500 nm.…”