The vibronic spectrum of the UO22+ cation in HF-AsF5 solution has been recorded in the range 340–450 nm and is much better resolved than corresponding aqueous spectra.
The vibronic spectrum of the UO22+ cation in HF-AsF5 solution has been recorded in the range 340–450 nm and is much better resolved than corresponding aqueous spectra.
Oxidation of iron porphyrin vinylidene complexes yields products previously formulated as having an important iron(IV) porphyrin π-cation radical resonance form. Reconsideration of literature results and analogous cobalt porphyrin reactions leads to the conclusion that pyrrole nitrogen alkylation occurs and that the likely electronic structure is that of an intermediate-spin (S = ) iron(III) porphyrin.
The influence of the immediate chemical environment of Ca2+ ion on the 43Ca resonance was studied in aqueous and nonaqueous solutions by calcium-43 NMR.
A copper-binding complex formed in the exopolysaccharide fraction of was isolated and characterized using a variety of techniques. By comparison with model Cu(II) complexes of uronic acids, it is shown that the forms a square-planer, cupric complex similar to cupric glucuronates.
High proline levels in the roots of copper-tolerant Armeria maritima are associated with copper tolerance and are not a response to copper stress.
The position of americium within lanthanides in respect to unit cell volumes has been determined for 25 isostructural MmXn compounds. A linear correlation between the position of americium and the electronegativity of X atom has been demonstrated. This result has been explained in terms of greater covalent shortening of Am-X than of Ln-X bonds.
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