Synthesis and characterization of low molecular weight oligomers of soluble polyaniline by electrospray ionization mass spectrometry

Dolan, Anthony R.; Wood, Troy D.

doi:10.1016/j.synthmet.2003.12.010

Cited by 17 publications

(14 citation statements)

References 32 publications

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“…The two peaks that are present both 15 Da higher and lower than the main distribution are the result of different end groups on the oligomeric chain. These other products are the direct result of the synthetic procedure, and have been reported elsewhere [36,38,42,44]. The general structures for the oligomers are shown in Figure 2.…”

Section: Resultssupporting

confidence: 66%

“…The synthesis of polyaniline was the same as previously described [44]. This method of synthesis was a procedure adopted from Chiang et al [45] in order to optimize the generation of low molecular weight oligomers of polyaniline.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Polyaniline and matrix (either DHB, dithranol, or TCNQ) were mixed and ground in a mortar with a pestle for 15 min in order to reduce the size of the polyaniline particles. A molar ratio of analyte to matrix of 1:50 was used (assuming a molecular weight of 1000 Da for polyaniline, as calculated from previous studies on these samples [44]) with approximately 2 mg of polyaniline being used for each sample. In order to adhere the ground sample to the plate, approximately 0.5 mg of the sample was spread out over several spots on the plate, giving a minimal amount of surface coverage.…”

Section: Sample Preparationmentioning

confidence: 99%

“…This has especially deterred structural analysis by mass spectrometry, as is evidenced by the limited numbers of MS studies of polyaniline [35][36][37][38][39][40][41][42][43]. Recently, we reported a synthetic procedure for polymerizing low molecular weight oligomers of polyaniline that were slightly soluble in acetonitrile and tetrahydrofuran [44]. This allowed for their detection by electrospray ionization triple quadrupole mass spectrometry, and four different end groups were found to be present on the various types of soluble oligomers.…”

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confidence: 99%

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Analysis of polyaniline oligomers by laser desorption ionization and solventless MALDI

Dolan

Wood

2004

J. Am. Soc. Mass Spectrom.

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While direct laser desorption ionization of soluble polyaniline dried onto metal sample plates results in mass spectra that are similar to previously shown electrospray ionization data of similar samples, laser desorption of unsolubilized solid polyaniline results in major fragmentation of the phenyl rings. Solventless MALDI, a recently developed technique for insoluble or slightly soluble species, involves the use of only solid analyte and matrix during sample preparation. Solventless MALDI of solid polyaniline results in mass spectra that are similar to the direct laser desorption ionization spectra of the soluble oligomers with some larger molecular weight oligomers also being detected. Based on the matrix used, different series of polyaniline with dissimilar end groups are detected. The matrix also affects the percentages of benzenoid and quinoid units in the oligomers. Thus, solventless MALDI appears to be a promising new technique for the mass spectrometric analysis of low solubility, but industrially important, polyanilines.

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Section: Resultssupporting

confidence: 66%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis of polyaniline oligomers by laser desorption ionization and solventless MALDI

Dolan

Wood

2004

J. Am. Soc. Mass Spectrom.

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“…When the reaction is carried out in the presence of a large amount of H2O2 (PANI_ref, 1 × 3 and 1 × 2), an intense peak at 366 m/z is observed, which can be attributed to linear tetramers (Table S3) [48]. This is the only peak appreciable in the PANI_ref spectrum, whereas the MS spectra of 1 × 2 and 1 × 3 samples present three other peaks at 727, 743 and 1092 m/z, which can be assigned to linear octamers and linear dodecamers [49]. By increasing the TiO2/H2O2 ratio (1 × 1 and 3 × 1 samples), the When the reaction is carried out in the presence of a large amount of H 2 O 2 (PANI_ref, 1 × 3 and 1 × 2), an intense peak at 366 m/z is observed, which can be attributed to linear tetramers (Table S3) [48].…”

Section: Mass Spectramentioning

confidence: 99%

Photocatalytic and Oxidative Synthetic Pathways for Highly Efficient PANI-TiO2 Nanocomposites as Organic and Inorganic Pollutant Sorbents

et al. 2020

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Polyaniline (PANI)-materials have recently been proposed for environmental remediation applications thanks to PANI stability and sorption properties. As an alternative to conventional PANI oxidative syntheses, which involve toxic carcinogenic compounds, an eco-friendly procedure was here adopted starting from benign reactants (aniline-dimer and H2O2) and initiated by ultraviolet (UV)-irradiated TiO2. To unlock the full potential of this procedure, we investigated the roles of TiO2 and H2O2 in the nanocomposites synthesis, with the aim of tailoring the properties of the final material to the desired application. The nanocomposites prepared by varying the TiO2:H2O2:aniline-dimer molar ratios were characterized for their thermal, optical, morphological, structural and surface properties. The reaction mechanism was investigated via mass analyses and X-ray photoelectron spectroscopy. The nanocomposites were tested on both methyl orange and hexavalent chromium removal. A fast dye-sorption was achieved also in the presence of interferents and the recovery of the dye was obtained upon eco-friendly conditions. An efficient Cr(VI) abatement was obtained also after consecutive tests and without any regeneration treatment. The fine understanding of the reaction mechanism allowed us to interpret the pollutant-removal performances of the different materials, leading to tailored nanocomposites in terms of maximum sorption and reduction capability upon consecutive tests even in simulated drinking water.

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Tandem Mass Spectrometry and Polymer Ion Dissociation

Polce¹,

Wesdemiotis

2009

Maldi Mass Spectrometry for Synthetic Polymer Analysis

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Synthesis and characterization of low molecular weight oligomers of soluble polyaniline by electrospray ionization mass spectrometry

Cited by 17 publications

References 32 publications

Analysis of polyaniline oligomers by laser desorption ionization and solventless MALDI

Analysis of polyaniline oligomers by laser desorption ionization and solventless MALDI

Photocatalytic and Oxidative Synthetic Pathways for Highly Efficient PANI-TiO2 Nanocomposites as Organic and Inorganic Pollutant Sorbents

Tandem Mass Spectrometry and Polymer Ion Dissociation

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