Investigations on the thermal stability of a diazonium ion on solid support

Bräse, Stefan; Dahmen, Stefan; Popescu, C.; Schroen, Maarten; Wortmann, Franz

doi:10.1016/s0141-3910(01)00235-x

Cited by 8 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To analyze the thermodynamic stability of these compounds, a DSC study was carried out. The thermogrammes for both compounds present a characteristic exothermic decomposition peak [15] of the diazonium ion centred at 120°C and starting at 60°C, temperatures corresponding to the degradation of these new diazonium salts. On the other hand, we also synthesized compounds with N þ directly fixed on a metal complex ligand without the phenyl ring spacer, like in 1 and 2.…”

Section: Resultsmentioning

confidence: 99%

One-step electrochemical modification of carbon nanotubes by ruthenium complexes via new diazonium salts

Jousselme

Bidan

Billon

et al. 2008

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

One-step electrochemical modification of carbon nanotubes by ruthenium complexes via new diazonium salts

Jousselme

Bidan

Billon

et al. 2008

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…Providing the value of Ea α keeps a fairly constant value, Ea , over the range of conversion degrees considered, one may also evaluate the analytical form of the kinetic function f ( α ) 20, 21. Equation (9) is rewritten as: …”

Section: Experimental Partmentioning

confidence: 99%

Non‐Isothermal Kinetics of Hard α‐Keratin Thermal Denaturation

Istrate

Popescu

Möller

2009

Macromolecular Bioscience

Self Cite

View full text Add to dashboard Cite

DSC measurements carried out at different heating rates were used for the kinetic analysis of the endothermic process assigned to the denaturation of the helical material from human hair in water excess. We found that the kinetic mechanism is autocatalytic and that the value of the activation energy is close to disulphide bond scission rather than to protein denaturation. This allowed us to propose a multistep mechanism for the thermal denaturation of hard alpha-keratins in water excess that relies on the 3-phase model which describes their structure. The limiting step of the thermal denaturation process is then the scission of S-S bonds between the main morphological components, namely IF and matrix (IFAP). The theoretical proposed model shows a good agreement with the experimental recorded data.

show abstract

“…In summary, the decomposition of DS followed a single n-order decomposition, which was in good agreement with other research works. 18,28 By the way, it is worthwhile to note that this method is developed on the basis of the apparent single-step n-order reactions and autocatalytic reactions. The method needs to be used prudently when it is applied to multiple decomposition reactions.…”

Section: Thermal Decomposition Kinetics Of Cer-supported Dsmentioning

confidence: 99%

“…By this way, some DS decomposed around 90−120 °C, as determined by the DSC test. 18 A-15 has also been used in DS and dye synthesis process, 19,20 but the thermal stability characteristics of DS synthesized with this resin have not been reported. Thus, this article carried out the diazotization of p-nitroaniline (p-NA) in the presence of sulfonic acid-based cation-exchange resins (A-15).…”

Section: Introductionmentioning

confidence: 99%

“…Aryl diazonium salts are not thermally stable and may decompose during separation. ,, One effective strategy to deal with this safety problem is the synthesis of diazonium salts on a solid support. By this way, some DS decomposed around 90–120 °C, as determined by the DSC test . A-15 has also been used in DS and dye synthesis process, , but the thermal stability characteristics of DS synthesized with this resin have not been reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Green and Low-Cost Synthesis of Thermally Stable Cation-Exchange Resin-Supported Diazonium Salt: An Example of Weakly Basic p-Nitroaniline Diazotization

Liu,

Feng,

Yan

et al. 2023

Org. Process Res. Dev.

View full text Add to dashboard Cite

Wide applications of diazonium salts (DS) are limited due to their nature of poor thermal stability and explosive hazards. In this work, strong acid cation-exchange resin (Amberlyst-15), as an acid and anion provider, was used to synthesize the corresponding diazonium salt of weakly basic p-nitroaniline (p-NA). The thermal stability of raw materials (p-nitroaniline, Amberlyst 15) and cation-exchange resin-supported DS (CER-supported DS) was characterized by DSC and ARC, respectively. The synthesis conditions were optimized, and the exothermicity of the diazotization reaction was characterized by reaction calorimetry. Diazonium salts of p-NA were demonstrated to be obtained and chemisorbed on the cation-exchange resin surface. The optimal yield of CERsupported DS reached up to 80%. The initial decomposition temperature and decomposition energy of the CER-supported DS were about 55 °C and 183 J/g, respectively. The decomposition process of the CER-supported DS followed a single n-order reaction model, and the main decomposition product was p-nitrophenol. The merits of this synthesis method include being free of environmentally harmful inorganic acids and high-cost of tert-butyl nitrites and having good storage stability.

show abstract

Investigations on the thermal stability of a diazonium ion on solid support

Cited by 8 publications

References 14 publications

One-step electrochemical modification of carbon nanotubes by ruthenium complexes via new diazonium salts

One-step electrochemical modification of carbon nanotubes by ruthenium complexes via new diazonium salts

Non‐Isothermal Kinetics of Hard α‐Keratin Thermal Denaturation

Green and Low-Cost Synthesis of Thermally Stable Cation-Exchange Resin-Supported Diazonium Salt: An Example of Weakly Basic p-Nitroaniline Diazotization

Contact Info

Product

Resources

About