13465-49-1Relevant academic research and scientific papers
On the knowledge of oxides A[MO4]: On LiMnO4, KMnO4, RbMnO4, CsMnO4 as well as RbIO4, CsIO4. (-What does the crystal structure of . . . mean? -)
Hoppe,Fischer,Schneider
, p. 1135 - 1142 (2008/10/08)
These investigations confirm again that, sufficient purity, symmetry and lack of disorder etc. of investigated single crystals provided: the structure of a solid is characterized only if a) lattice constants are determined precisely by powder data; b) a couple of single crystals is sufficiently investigated by film data; c) the quantitative comparison of crystal structures of a chemical series like A[MnO4] with another one like A2[SO4] alone enables one to estimate the quality of different structural investigations of the same material. d) The crystal structure of a solid is still non-existent.
Alkali metal ion, temperature, and pressure effects on the rate of electron transfer between manganate(VI) and permanganate(VII) ions in alkaline aqueous solution
Spiccia, Leone,Swaddle, Thomas W.
, p. 2265 - 2271 (2008/10/08)
The rate of outer-sphere electron transfer between MnO4- and MnO42- in aqueous MOH at constant ionic strength (1.1 mol L-1) is given by (k0 + kM[M+])[MnO4-][MnO4 2-], where k0 is defined by the activation parameters ΔH0* = 46 kJ mol-1, ΔS0* = -35 J K-1 mol-1, ΔV0°*(0.1 MPa, 318 K) = -23 cm3 mol-1, and Δβ0* ? -0.06 cm3 mol-1 MPa-1. For M = Li, Na, K, and Rb, respectively, kM is given by ΔHM* = 33.1, 32.2, 32.9, and 32.9 kJ mol-1 and ΔSM* = -67.8, -68.4, -62.9, and -59.0 J K-1 mol-1, while, for M = Na and K, ΔVM* = +3 and -1 cm3 mol-1. The activation parameters for the cation-independent reaction pathway can be accounted for by a modified semiclassical Marcus-Hush theory if, in the transition state for adiabatic or nearly adiabatic electron transfer, the reacting ions are taken to be enclosed within a common cavity in the solvent and the Mn-Mn distance compresses as does the cavity, which is assumed to have the same compressibility as the solvent itself. The lower enthalpies, and markedly more positive volumes, of activation for the M+-catalyzed pathway appear to arise at least in part from an easing of these solvational constraints.
