Formation of Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I) and Cd(II) hexacyanocobaltates

Robertis, Alessandro De; Bellomo, Athos; Marco, Domenico De

doi:10.1016/0039-9140(76)80074-4

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…The MSA technique also allows unconventional combinations of ions so that films of little investigated hexacyanometalate complex salts such as Fe II HCC III and Co II HCC III can be easily prepared. Fe II HCC III films are transparent and exhibit a brownish yellow color, whereas for the bulk material an ivory yellow color is reported . In Figure f UV/visible spectra of the films are shown, indicating a strong absorption in the UV with a long-wavelength tail extended to the visible.…”

Section: Resultsmentioning

confidence: 93%

“…Fe II HCC III films are transparent and exhibit a brownish yellow color, whereas for the bulk material an ivory yellow color is reported. 30 In Figure 2f UV/visible spectra of the films are shown, indicating a strong absorption in the UV with a long-wavelength tail extended to the visible. A charge-transfer band in the visible is lacking.…”

Section: Films Of Iron and Cobalt Hexacyanocobaltatementioning

confidence: 99%

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Self-assembled Films of Prussian Blue and Analogues: Optical and Electrochemical Properties and Application as Ion-Sieving Membranes

et al. 2002

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Ultrathin films of metal hexacyanometalates were prepared upon multiple sequential adsorption of metal cations M m + (Fe3+, Fe2+, Co2+, and Ni2+) and hexacyanometalate anions [M(CN)6] n - (Fe(CN)6 3-, Fe(CN)6 4-, and Co(CN)6 3-) on solid supports. The layer-by-layer deposition led to the formation of films of the metal complex salts with monolayer precision. The films were characterized using UV and IR spectroscopic methods and cyclic voltammetry. The alternating adsorption of Fe3+ and Fe(CN)6 4- ions led to dense and defect-free films of Prussian Blue, which were useful as membranes for ion separation. The porous, zeolitic structure of Prussian Blue was permeable for ions with a small Stokes radius such as Cs+, K+, and Cl-, whereas large hydrated ions such as Na+, Li+, Mg2+, or SO4 2- were blocked. The effect of ion sieving increased with the thickness of the membrane. After a hundred dipping cycles, high separation factors α(CsCl/NaCl) and α(KCl/NaCl) of 6.5 and 6.2, respectively, were found. Corresponding membranes of cobalt and nickel hexacyanoferrate were also useful for ion separation, but the α-values were lower. Possible reasons for the differences in selectivity are discussed.

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Section: Resultsmentioning

confidence: 93%

Section: Films Of Iron and Cobalt Hexacyanocobaltatementioning

confidence: 99%

Self-assembled Films of Prussian Blue and Analogues: Optical and Electrochemical Properties and Application as Ion-Sieving Membranes

et al. 2002

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“…The soluble monomer, K3[Co(CN)6], or KHCC, reacts with the divalent cations of the first row transition metals (3d-block) to form a variety of coordination polymers of the general formula KM II [Co(CN)6].xH20 and lVI~II[Co(CN)612.xH20, where M zI is Mn, Fe, Co, Ni, Cu, or Zn. The reaction stoichiometries of the various coordination polymers have been reported [3]. The cyanide ligand acts as a bidentate ligand or bridged group to build up a linkage structure Co-C---N-M II [4].…”

Section: Introductionmentioning

confidence: 99%

On the use of hexacyanocobaltates in the separation of caesium from radioactive waste solutions

Mekhail

Aly

1999

Czech J Phys

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This paper reviews our work on the use ofhexacyanocobaltate salts in the chemical treatment of radioactive waste solutions. The divalent cations of the 3d-block elements together with the hexacyanocobaltate moiety form insoluble polymeric coordination compounds. These compounds have been used as chemical precipitants or ion exchangers for the separation ofradiocesium from various simulated and actual waste solutions. Precipitation in situ has been performed by using various hexacyanocobaltate salts of the divalent cations ofMn, Fe, Co and Ni. The results showed that Co 2 § and Ni 2 § salts have high selectivity for caesium. The presence of monovalent cations and detergent has significant effect on the precipitation process. On the other hand Cd 2 § salt has been found to be more stable than other salts in alkaline medium. As ion exchanger the sorption properties ofhexacyanocobaltate salts were studied. Adsorption of a cesium seems to proceed via an ion exchange mechanism. It has been used for the treatment of reprocessing medium active waste solution. A decontamination factor of about 103 has been achieved.

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Influence of the solvent medium on formation of Cu(II), Zn(II) and Ni(II) hexacyanocobaltates☆

Robertis

Bellomo

Marco

1979

Talanta

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Formation of Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I) and Cd(II) hexacyanocobaltates

Cited by 9 publications

References 4 publications

Self-assembled Films of Prussian Blue and Analogues: Optical and Electrochemical Properties and Application as Ion-Sieving Membranes

Self-assembled Films of Prussian Blue and Analogues: Optical and Electrochemical Properties and Application as Ion-Sieving Membranes

On the use of hexacyanocobaltates in the separation of caesium from radioactive waste solutions

Influence of the solvent medium on formation of Cu(II), Zn(II) and Ni(II) hexacyanocobaltates☆

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