Exploring the metallochromic behavior of pentacyanidoferrates in visual, electronic and Raman spot tests

Shinohara, Jorge S.; Grasseschi, Daniel; Almeida, Sabrina N.; Toma, Henrique E.

doi:10.1590/0001-3765201920180315

Cited by 3 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two peaks located at 2198 cm −1 and 2225 cm −1 for CoNiFe- x (except x ≠ 1) were assigned to the vibrations of CN(Fe 2+ )–Ni 3+/2+ and CN(Fe 3+ )–Ni 2+ , respectively; CoNiFe samples (except x ≠ 0) showed two similar signal peaks at 2111 cm −1 and 2143 cm −1 , which were attributed to CN(Fe 2+ )–Co 3+/2+ and CN(Fe 3+ )–Co 2+ , respectively. 39 Moreover, it exhibited two weak signals at 1346 cm −1 and 1585 cm −1 , corresponding to the D-band and G-band of the carbon material, respectively.…”

Section: Resultsmentioning

confidence: 99%

Tailoring trimetallic CoNiFe oxide nanostructured catalysts for the efficient electrochemical conversion of methane to methanol

et al. 2022

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Tailoring trimetallic CoNiFe oxide nanostructured catalysts for the efficient electrochemical conversion of methane to methanol

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Printing reagents depend on the metal to be identified. In some cases, direct printing was possible as for iron using potassium hexacyanoferrate(II), which reacts with diffused Fe 3+ ions to form iron(III) hexacyanoferrate(II) (Prussian blue) [ 51 ]. A contribution by Kraft dedicated to Prussian blue can be also found in ChemTexts [ 52 ].…”

Section: Methodology Of Spot Testsmentioning

confidence: 99%

Spot tests: past and present

Doménech‐Carbó

2021

ChemTexts

View full text Add to dashboard Cite

Graphic abstract Microchemistry, i.e., the chemistry performed at the scale of a microgram or less, has its roots in the late eighteenth and early nineteenth centuries. In the first half of the twentieth century a wide range of spot tests have been developed. For didactic reasons, they are still part of the curriculum of chemistry students. However, they are even highly important for applied analyses in conservation of cultural heritage, food science, forensic science, clinical and pharmacological sciences, geochemistry, and environmental sciences. Modern pregnancy tests, virus tests, etc. are the most recent examples of sophisticated spot tests. The present ChemTexts contribution aims to provide an overview of the past and present of this analytical methodology.

show abstract

“…In the presence of transition metal ions, such as Fe(III) and Zn(II) the [Fe(phtpz) 2 {Fe(CN) 5 } 4 ] 10complex forms insoluble extended polymers, analogous to the Prussian Blue compound, through the formation of Fe II -CN-Fe III or Fe II -CN-Zn II bonds. 23 Their electronic species can be seen in Figure 9. The Fe x [Fe(phtpz) 2 {Fe(CN) 5 } 4 ] exhibit a broad intervalence transfer band around 750 nm, as in the Prussian Blue complex.…”

Section: Raman Spectra Of the [Fe(phtpy) 2 ] 2+ And [Fe(phtpz) 2 ] 2+mentioning

confidence: 99%

Raman Studies of Bis(phenylterpyrazine)iron(ii) and Supramolecular Species With Pentacyanidoferrate(ii) Ions

Mangoni¹,

Brandão²,

Shinohara³

et al. 2019

Quím. Nova

View full text Add to dashboard Cite

The chemistry and spectroscopy of the iron(II) phenylterpyrazine complex, [Fe(phtpz) 2 ] 2+ , were investigated in comparison with the analogous phenylterpyridine species, Fe(phtpy) 2 ] 2+ , and the results indicated a strong electronic delocalization on the Fe(II) terimine chromophore encompassing the lateral pyrazyl groups. The delocalized nature of the molecular orbitals involved in the electronic excitation precluded a direct assignment of the pyridine and pyrazine vibrations in the complex. However, the capability of the terpyrazine complex to bind transition metal ions, such as the [Fe(CN) 5 ] 3species, allowed to generate pentanuclear complexes displaying characteristic charge-transfer and resonance Raman spectra, revealing the pyrazine vibrations in the complex. The [Fe(CN) 5 ] 3containing species also yielded polymeric compounds in presence of transition metal ions, exhibiting intervalence transfer bands and chemical similarities with the Prussian Blue complex.

show abstract

Exploring the metallochromic behavior of pentacyanidoferrates in visual, electronic and Raman spot tests

Cited by 3 publications

References 16 publications

Tailoring trimetallic CoNiFe oxide nanostructured catalysts for the efficient electrochemical conversion of methane to methanol

Tailoring trimetallic CoNiFe oxide nanostructured catalysts for the efficient electrochemical conversion of methane to methanol

Spot tests: past and present

Raman Studies of Bis(phenylterpyrazine)iron(ii) and Supramolecular Species With Pentacyanidoferrate(ii) Ions

Contact Info

Product

Resources

About