Low potential electrosyntheses of high quality freestanding polyazulene films

Nie, Guangming; Cai, Tao; Zhang, Shusheng; Hou, Jian; Xu, Jingkun; Han, Xuejun

doi:10.1016/j.matlet.2006.11.004

Cited by 22 publications

(19 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This particular band, however, has a much lower intensity in the spectrum of the PAz film which may mean that in the OAzTiO 2 composite some Az monomer is left. This kind of a broad absorbance in the UV-vis spectral region of the neutral state of PAz has also been reported earlier [20][21][22][23][24][25][26] and can be regarded as a benefit in further development of this kind of material for solar cell applications.…”

Section: In Situ Uv-visible Spectroelectrochemical Characterizationsupporting

confidence: 77%

“…The absorption maximum of neutral PAz Fig. 7 The ex situ FTIR spectra of the nanoporous OAz-TiO 2 layer and of the PAz film using a spectrum of ITO/TiO 2 electrode and ITO, respectively, as reference has also been reported by other groups [20][21][22][23][24][25][26][27] to be around 420 nm for both chemically and electrochemically synthesized PAz films. As the absorption maximum of OAz in the composite structure is located at 63 nm higher wavelength it can be concluded that delocalization of the p electrons in OAz in nanoporous TiO 2 is increased.…”

Section: In Situ Uv-visible Spectroelectrochemical Characterizationmentioning

confidence: 59%

“…The intensity of the band at 1475 cm -1 in the spectrum of PAz (almost invisible in the spectrum of OAz-TiO 2 composite) may indicate that PAz on ITO is in more conductive state than the composite layer. Az monomer has a band at 1395 cm -1 [25] which is more intense in the spectrum of the composite layer than in PAz. This can be regarded as evidence of formation of shorter chains in the composite due to monosubstituted Az units.…”

Section: Ftir Characterizationmentioning

confidence: 94%

“…In order to cover most of the solar spectrum, ECPs with an appropriately low band gap are highly sought [20]. The absorbance of PAz in the UV and visible spectral regions is also rather broad [20][21][22][23][24][25][26] making PAz an attractive material for applications in solar cells. PAz has also been shown to have electron-donating properties [21,[28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electrochemical preparation of oligo(azulene) on nanoporous TiO2 and characterization of the composite layer

2010

View full text Add to dashboard Cite

A nanoporous oligo(azulene)-TiO 2 (OAz-TiO 2 ) composite layer was formed by electrochemical oxidation of azulene (Az) on a nanoporous ITO/TiO 2 electrode. Polymerization was performed in tetrabutylammonium hexafluorophosphate electrolyte salt dissolved in acetonitrile. The electrochemical and optical properties of the composite layer were studied by cyclic voltammetry (CV) and in situ UV-vis spectroelectrochemistry. The chemical and crystalline structure of the layer was studied by FTIR and X-ray diffraction (XRD) spectroscopy techniques and the morphology by Scanning Electron Microscopy. The TiO 2 layer was found to have a catalytic activity on the polymerization of Az. The CV experiments in monomerfree electrolyte solution demonstrated the electron donor property of OAz by its p-doping and the electron accepting property of TiO 2 by the large reduction current in the negative potential region. The FTIR and XRD spectroscopic measurements showed the well-defined anatase structure of TiO 2 with inclusion of OAz. A composite layer was formed rather than a bilayer structure. The in situ UVvis spectroelectrochemical measurements gave evidence of a higher delocalization and easier movement of the p-electrons in the composite layer than in pure poly (azulene).

show abstract

Section: In Situ Uv-visible Spectroelectrochemical Characterizationsupporting

confidence: 77%

Section: In Situ Uv-visible Spectroelectrochemical Characterizationmentioning

confidence: 59%

Section: Ftir Characterizationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical preparation of oligo(azulene) on nanoporous TiO2 and characterization of the composite layer

2010

View full text Add to dashboard Cite

show abstract

“…In the negative scan, as-prepared polymer is reduced. Redox wave currents increase upon sequential cycles, indicating increases in the amount of the polymer deposited on the working electrode [34]. The broad redox waves of as-formed PoDHB film may be ascribable to the wide distribution of the polymer chain length [33] or the conversion of conductive species on polymer main chain from the neutral state to polarons, from polarons to bipolarons, and finally from bipolarons to the metallic state [35].…”

Section: Electrochemical Synthesis and Electrochemical Behaviors Of Pmentioning

confidence: 99%

Preparation of Platinum‐Poly(O‐dihydroxybenzene) Composite Catalyst and Its Electrocatalytic Activity Toward Methanol and Formic Acid Oxidation

et al. 2012

View full text Add to dashboard Cite

A composite catalyst has been successfully prepared by dispersing Pt nanoparticles on a poly(o‐dihydroxybenzene) (PoDHB) modified glassy carbon (GC) electrode and characterized by SEM, EDX, and electrochemical analysis. Compared with Pt nanoparticles deposited on the bare GC, the Pt/PoDHB/GC exhibits higher catalytic activity and stronger poisoning tolerance for electro‐oxidation of methanol and formic acid. The enhanced performance could be attributed to the increase of electrochemical active surface area (EASA) arisen from the PoDHB modification. Furthermore, performance limiting factors such as platinum loading, polymer mass, H2SO4, methanol, and formic acid concentrations have been evaluated for optimizing the electrocatalytic activities.

show abstract

Synthesis and Electrochemical Properties of Carbocyclic and Heterocyclic Diazulenylethenes

et al. 2013

View full text Add to dashboard Cite

An efficient two‐step method was developed for the synthesis of 1,2‐di(azulen‐1‐yl)ethenes 15–17, having the double bond included in a five‐membered carbocyclic or heterocyclic ring. The method involves preparation of the appropriate diketone precursors through Vilsmeier–Haack or Friedel–Crafts reactions, followed by their McMurry cyclization. Alkenes 16 and 17 were quantitatively converted into the corresponding dehydro derivatives 24 and 25, respectively, by oxidation with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ). The electrochemical properties of compounds 15–17, 24 and 25 were examined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), and the relationship between their structure and electrochemical behavior was established.

show abstract

Low potential electrosyntheses of high quality freestanding polyazulene films

Cited by 22 publications

References 26 publications

Electrochemical preparation of oligo(azulene) on nanoporous TiO2 and characterization of the composite layer

Electrochemical preparation of oligo(azulene) on nanoporous TiO2 and characterization of the composite layer

Preparation of Platinum‐Poly(O‐dihydroxybenzene) Composite Catalyst and Its Electrocatalytic Activity Toward Methanol and Formic Acid Oxidation

Synthesis and Electrochemical Properties of Carbocyclic and Heterocyclic Diazulenylethenes

Contact Info

Product

Resources

About