The structure in aqueous solutions of the hydrated selenate and chromated ions SeO42- and CrO42- have been derived from X-ray and neutron diffraction measurements using CrO42- as an isomorphous substitute for SeO42-. The Se(Cr)-O bond lengths are 1.63 +/- 0.02 angstrom and do not differ from those found in crystal structure. A well defined hydration shell of about 12 water molecules surrounds the XO42- ions at a Se(Cr)-H2O distance of 3.96 angstrom. The diffraction results indicate a geometrical orientation of the water molecule around the tetrahedral anions very similar to that one found in the case of simple anions such as Cl-, with Se(Cr)-D distances of 3.25 and 4.4 angstrom and with a Se(Cr)-O distance of 3.96 angstrom
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Titolo: | X-ray and neutron diffraction studies of the hydration of SeO4= and CrO4= anions by isomorphic substition. | |
Autori: | ||
Data di pubblicazione: | 1992 | |
Rivista: | ||
Handle: | http://hdl.handle.net/11573/29478 | |
Appartiene alla tipologia: | 01a Articolo in rivista |