Formation of Trithiocyanate in the Oxidation of Aqueous Thiocyanate

Barnett, Jon J.; Stanbury, David M.

doi:10.1021/ic015597d

Cited by 32 publications

(61 citation statements)

References 20 publications

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“…10 Trace amount of thiocyanate could also be used as an anticancer reagent through eliminating radicals inside human body. [11][12][13][14] However, the presence of a large quantity of thiocyanate in industrial effluent would impose a great threat on our environment. Therefore, finding a way to manipulate the presence of thiocyanate or convert it to less pollutant sulfur compounds becomes increasingly desired.…”

Section: Introductionmentioning

confidence: 99%

Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Liu

Feng

et al. 2009

Chin. J. Chem.

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Kinetics and mechanism of the electrochemical oxidation of thiocyanate on a Pt electrode were investigated by using various electrochemical methods, in which both current and potential oscillations have been observed. Cyclic voltammetry measurements illustrate that the oxidation process consists of two steps. In addition to the oscillatory behavior, the system also exhibits bistability, in which the oxidation could be switched between a high and a low current density states with a temporal potential perturbation. The presence of inert ions with stronger absorption also induces transitions from oscillatory to steady reactions in the thiocyanate system.

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Section: Introductionmentioning

confidence: 99%

Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Liu

Feng

et al. 2009

Chin. J. Chem.

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“…With the exception of Equation (2), autoreduction of Cu II to Cu I is concomitant with the favourable oxidation [29] of XCN ) to (XCN) 2 (X ¼ S, Se).…”

Section: Resultsmentioning

confidence: 99%

“…The thiocyanogen, (SCN) 2 and selenocyanogen, (SeCN) 2 formed in the above reactions decompose rapidly [29] into HOSCN, HSCN HOSeCN and HSeCN, respectively. All the new complexes are air and moisture-stable at room temperature.…”

Section: Resultsmentioning

confidence: 99%

New heterometallic coordination polymers derived form chalcogenocyanates: synthesis, characterization and electrical properties

Singh

Sinha

2004

Transition Metal Chemistry

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A series of conducting mixed-metallic coordination polymers: Cu 2 Pb(SCN) 4 , CuPb(SeCN) 4 , Cu II 0:50 Cu I Pb (SCN AE SeCN) 2 , CuAg(SCN) 2 , CuAg(SeCN) 2 and CuAg(SCN AE SeCN) have been synthesized by the reaction of Cu II and Pb II or Ag I nitrates with KSCN or KSeCN, or both KSCN and KSeCN in H 2 O. Of significance are the aerobic reactions which yield heterometallic complexes via oxidation of SCN ) and SeCN ) into (SCN) 2 and (SeCN) 2 followed by quantitative reduction of Cu II into Cu I ; in the case of CuPb(SeCN) 4 reduction of Cu II into Cu I is not observed, while in Cu II 0:50 Cu I Pb(SCN AE SeCN) 2 , Cu II is partially reduced to Cu I . These compounds have been characterized by elemental (C, N, S and Se) analyses, magnetic moment measurements, relevant spectroscopies (i.r., far i.r., Raman, u.v.-vis. and e.p.r.), powder X-ray diffraction pattern and conductivity technique. The v(CBN) vibrations in 2162-2087 cm )1 and far i.r. bands (500-100 cm )1 ) corroborated by Raman bands are conclusive of the bridging (N, S/Se) mode and metal-NCS and metal-SCN/SeCN ) bonding respectively in the complexes. Room temperature magnetic moment, electronic absorption spectra and e.p.r. active/silent nature confirm the oxidation state of copper in these solids. Room temperature compressed pellet conductivities r rt , 10 )9 to 10 )7 S cm )1 with activation energies, E a ¼ 0.19-0.25 eV and increase in the conductivity with increase in temperature in the 305-423 K, range and decrease in conductivity with decrease in temperature in the 295-200 K range, show their semiconductor properties.

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“…, a reaction which is in keeping with the behavior of dicyanogen as a pseudohalogen. However, neither species shows strong absorbance [14]. This represents an excess of KSeCN, assuming 1 mol iodine reacts with 2 mol KSeCN, as indicated in the introduction.…”

mentioning

confidence: 90%

“…After 18 min reaction time a further iodine species is formed, which shows a large peak at about 290 nm. b) Barnett and Stanbury [14] have proposed that, as well as dicyanogen being formed, some soluble trithiocyanate is formed, particularly at higher concentrations of thiocyanate, i.e. (SCN) 2…”

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confidence: 99%

The Influence of Thiocyanate Ions on the Formation of the Starch‐Iodine Complex

Cornell

Rix

2006

Starch Stärke

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The redox reaction between thiocyanate and iodine species present in an aqueous solution of KI results in the formation of thiocyanogen, (SCN) 2 . This reaction interferes with the formation of inclusion complexes of a potato amylose with iodine species such as I 3 2 and I 5 2. As these ions react with thiocyanate ions (SCN 2 ) the blue colour of the amylose-iodine complex diminishes. The rate of this decrease depends upon the concentration of both the SCN 2 and the iodine, and appears to follow pseudo-second order kinetics. Using a UV/visible spectrophotometer the reaction of iodine with KSCN can be followed, with or without amylose, and shows a lowering in concentration of iodine species absorbing at 290-300 nm, together with a lowering in absorbance at 630 nm, due to a lesser amount of the amylose-iodine complex. Interference with iodine complex formation was also noted with a potato amylopectin. The technique provides the basis for the study of other reactions of iodine such as that with selenocyanate (SeCN 2 ).

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Formation of Trithiocyanate in the Oxidation of Aqueous Thiocyanate

Cited by 32 publications

References 20 publications

Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

Dynamical Complexity in Electrochemical Oxidations of Thiocyanate

New heterometallic coordination polymers derived form chalcogenocyanates: synthesis, characterization and electrical properties

The Influence of Thiocyanate Ions on the Formation of the Starch‐Iodine Complex

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