Catechol polymerization in the presence of silver surface

Sánchez-Cortés, Santiago; Francioso, Ornella; Garcı́a-Ramos, José Vicente; Ciavatta, Claudio; Gessa, C.

doi:10.1016/s0927-7757(00)00630-0

Cited by 88 publications

(69 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The peaks due to symmetric vibration of ether (C-O-C) linkage appear at 1133 and 1023 cm )1 The overall absorbance of the enzymatically dyed cotton fabrics increased in the region 1000-1600 and more pronounced between 1400 and 1600 cm )1 . This suggests large conjugation of aromatic rings through C-C, C-O-C, -N=C and -NH-bonds (Shaw and Freeman 2004;Aktas et al 2003;Sá nchez-Corté s et al 2001;Kramer et al 2001;David et al 1996;Dubey et al 1998). …”

Section: Resultsmentioning

confidence: 99%

Laccase-assisted Dyeing of Cotton

et al. 2006

View full text Add to dashboard Cite

Cotton cellulose was dyed "in situ" with a polymeric dye generated by oxidative coupling of colourless 2,5-diaminobenzenesulfonic acid and 1-hydroxyphenol (catechol) with laccase. Up to 70% dye fixation was obtained increasing the concentration of catechol less soluble upon oxidation from 1 to 10 mmol, while 1 mmol of diamine was used. Dye fixation was not achieved using equal molar concentrations of the reagents.

show abstract

Section: Resultsmentioning

confidence: 99%

Laccase-assisted Dyeing of Cotton

et al. 2006

View full text Add to dashboard Cite

show abstract

“…In some cases, this interaction is so strong that a chemical degradation occurs in the adsorbate. This is the case of polyphenols with OH groups in ortho-position, such as catechol [22], caffeic acid [23], or gallic acid [24]. When a chemical modification in the adsorbate is induced upon adsorption on the metal, a completely different SERS spectrum is recorded.…”

Section: Resultsmentioning

confidence: 99%

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

et al. 2007

View full text Add to dashboard Cite

The interaction between adsorbates of different nature and plasmonic nanoparticles is reviewed here on the basis of the work done in our laboratory in the past few years. The paper is structured for analyzing the interaction of adsorbates with metal nanoparticles as function of the interacting atom (O, N, or S) and the adsorbate conformation. In the study of the adsorption of molecular species on metals, it is necessary to take into account that different interaction mechanisms are possible, leading to the existence of different molecular forms (isomers or conformers). These forms can be evidenced by changing the excitation wavelength, due to a resonant selection of these wavelengths. Charge-transfer complexes and electrostatic interactions are the usual driving forces involved in the interaction of adsorbates on metal surfaces when these metallic systems are used in wet conditions. The understanding of the metal-adsorbate interaction is crucial in the surface functionalization of metal surfaces, which has a growing importance in the development of sensing systems or optoelectronic devices. In relation to this, special attention is paid in this work to the study of the adsorption of calixarene host molecules on plasmonic nanoparticles.

show abstract

“…31 The Raman spectra of related aromatic compounds such as p-hydroxybenzoic acid 32 and guaiacol 33 also show a medium Raman band seen at 1517 cm À1 . Moreover, intense Raman bands were found in the SERS spectra of caffeic acid, 34 cathecol, 35 gallic acid, 36 and vanillic acid 32 at 1505, 1519, 1515, and 1537 cm À1 , respectively. Some of these molecules were reported to have undergone a chemical change leading to lignin-like polyaromatic products, with a high content in oxygen groups, similar to those forming part of the low molecular weight humic substances.…”

Section: Discussionmentioning

confidence: 99%

Surface-Enhanced Raman Spectroscopy of Chernozem Humic Acid and Their Fractions Obtained by Coupled Size Exclusion Chromatography—Polyacrylamide Gel Electrophoresis (SEC-PAGE)

et al. 2006

View full text Add to dashboard Cite

A humic acid extracted from a chernozem soil was fractionated combining size exclusion chromatography and polyacrylamide electrophoresis (SEC-PAGE). Three fractions named A, B, and CþD, with different electrophoretic mobilities and molecular sizes (MS), were obtained and subsequently characterized by thermochemolysis and surface-enhanced Raman spectroscopy (SERS). The data confirmed that fraction A, with the higher MS, was more aliphatic than fractions B and CþD and, in turn, fractions with lower MS (B and CþD) denoted an enrichment in lignin residues. These structural features explain conformational changes when varying the pH in the humic fraction A and indicated that combination of the two techniques is a good approach for characterizing humic substances.

show abstract

Catechol polymerization in the presence of silver surface

Cited by 88 publications

References 29 publications

Laccase-assisted Dyeing of Cotton

Laccase-assisted Dyeing of Cotton

Importance of Metal–Adsorbate Interactions for the Surface-enhanced Raman Scattering of Molecules Adsorbed on Plasmonic Nanoparticles

Surface-Enhanced Raman Spectroscopy of Chernozem Humic Acid and Their Fractions Obtained by Coupled Size Exclusion Chromatography—Polyacrylamide Gel Electrophoresis (SEC-PAGE)

Contact Info

Product

Resources

About