Raman Spectra of Hydroxo Complexes of Tin (II) and Lead (II) in Strongly Alkaline Solutions, and of Antimony (III) Fluoride in Various Solvents

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  • Raman Spectra of Hydroxo Complexes of T

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A number of studies have been carried out on the Raman spectra of metallic hydroxo complexes. However, it seems that there are no published data on the Raman spectra of the hydroxo complexes of tin (II) and lead (II) formed in very concentrated alkali solutions. Such ions (the so-called stannite and plumbite ions) were described formerly as [MO_2]^<2->, and more recently as [M(OH)_4]^<2->, but recent literature tends to formulate them as [HMO_2]^- or [M(OH)_3]^-. The last formulation seems to be the most reasonable, in view of a number of stability and solubility data. It is also in conformity with the structural expectation, that the inert electron pair (ns^2) of Sn^<2+> or Pb^<2+> will tend to occupy a coordination site and favor the formation of the pyramidal (i.e. NH_3-like) [M(OH)_3]^- complex in strongly alkaline solutions. We have tried to observe the Raman spectra of such complexes, and, for the sake of comparison, also those of antimony (III) fluoride, which is isoelectronic with [Sn(OH)_3]^-, in aqueous and organic solutions,

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