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- W2085183609 abstract "Abstract Nanomolybdomanganate(IV) anion is orange colored due to the heteroatom Mn(IV). The solution absorption spectra in the visible region varied as a function of the concentrations of hydrogen ion or various metal cations such as Li + , Na + , K + , Mg 2+ , Ca 2+ and trivalent lanthanides. The absorption peak at 468 nm with a shoulder at 484 nm was observed when the pH of the solution was raised or the metal cation concentrations were increased. The spectra have two isosbestic points at 435 and 520 nm which were same for all set of spectra studied. Based on this, it was assumed that the anion was present as protonated and metal bound species in the solution. The absorbance at 468 nm was measured at various hydrogen or metal cation concentrations and analyzed to determine the equilibrium constants for the binding of metal cations. The metal to ligand ratios were 2:1 for Li + , Na + , K + and NH 4 + , and 1:1 for the rest of the cations. It was assumed the metal cation(s) replaced two protons from one anion in all cases. The equilibrium constants were larger for cations of higher positive ionic charge and of larger ionic size. The decrease in the stability constants with increasing atomic number suggests that the Ln 3+ -anion binding may involve outer sphere interaction." @default.
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- W2085183609 date "1997-05-01" @default.
- W2085183609 modified "2023-09-27" @default.
- W2085183609 title "Spectrophotometric studies of metal cation interaction with nanomolybdomanganate(IV) anion, MnMo9O326−" @default.
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- W2085183609 doi "https://doi.org/10.1016/s0020-1693(96)05465-5" @default.
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