No abstract

No abstract

Cation coordination number measurements of AlCl3, AlBr3, Al(ClO4)3, Al(NO3)3, BeCl2, GaCl3, GA(ClO4), InCl3, In(Cl)4)3, and Mg(ClO4)2, in water, and in aqueous acetone mixtures have been carried out by a proton magnetic resonance method. At low temperatures, solutions of these electrolytes exhibit separate proton resonance signals for bulk water, and water molecules in the first solvation shell of the cation. Integration of these signals provides a direct measure of the coordination number of the cation. The Al(III) and Ga(III) are solvated by six water molecules in all solutions, regardless of the anion present. The Be(II) is coordinated by four water molecules in water and in aqueous acetone mixtures. The In(III) and Mg(II) could only be studied in aqueous acetone mixtures, wherein they are each coordinated by six water molecules. With the possible exception of Be(II) no evidence for contact ion pairing was found.

A cation hydration number study has been carried out for solutions of UO2(C104)2, U02(N03)2, U02C12, and U02Br2 in water-acetone mixtures by the direct proton magnetic resonance (pmr) method. At temperatures below -85°, proton exchange is slow enough to permit the observation of separate pmr signals for bulk water molecules and water molecules in the U022+ solvation shell. In CIO4solutions, U022+ is hydrated by a maximum of four water molecules and complex formation is negligible. Bidentate complexing occurs with N03and the equilibrium quotient for the formation of the mononitrato complex is roughly an order of magnitude greater than that for the dinitrato complex. Complexing is evident in the Cland Brsolutions but spectral complexities prevented an unambiguous identification of the species.

Methyl isocyanide product: Methyl isocyanide reactant: Quinoline, practical grade product: methyl (50%), ethyl (45%), s‐butyl (35%) and cyclobutyl (24%) isocyanides