The colours of charge-transfer complexes of methyl viologen: effects of donor, ionic strength and solvent

Monk, Paul; Hodgkinson, Neil M.; Partridge, Robert D.

doi:10.1016/s0143-7208(99)00063-7

Cited by 46 publications

(35 citation statements)

References 24 publications

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“…This inkling aligns with findings presented above, indicating both thermodynamic and kinetic factors of ion pairing equilibria could be responsible for the disparity of redox behaviour of 1a(PF 6 ) 2 and 1a(OTf) 2 and their reduction products [86,87].…”

Section: Bisbithiopheneviologenssupporting

confidence: 90%

Spectroelectrochemistry of alternating ambipolar copolymers of 4,4′- and 2,2′-bipyridine isomers and quaterthiophene

Zassowski

Golba

Skórka

et al. 2017

Electrochimica Acta

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of alternating ambipolar copolymers of 4,4 -and 2,2 -bipyridine isomers and quaterthiophene, Electrochimica Acta http://dx.doi.org/10. 1016/j.electacta.2017.01.076 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Bisbithiopheneviologenssupporting

confidence: 90%

Spectroelectrochemistry of alternating ambipolar copolymers of 4,4′- and 2,2′-bipyridine isomers and quaterthiophene

Zassowski

Golba

Skórka

et al. 2017

Electrochimica Acta

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“…29 Fig. The MDA-cured ER/cellulose networks were also completely or near-transparent with cellulose content up to 10 wt%; however, they appeared translucent or opaque with higher cellulose content at room temperature as shown in Moreover, the specimens were all appeared in different colors and was very obvious when compared with neat resin (green) and cellulose added blends (brown shades).…”

mentioning

confidence: 90%

Thermally flexible epoxy/cellulose blends mediated by an ionic liquid

et al. 2015

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Blends between the widely used thermoset resin, epoxy, and the most abundant organic material, natural cellulose are demonstrated for the first time. The blending modification induced by charge transfer complexes using a room temperature ionic liquid, leads to the formation of thermally flexible thermoset materials. The blend materials containing low concentrations of cellulose were optically transparent which indicates the miscibility at these compositions. We observed the existence of intermolecular hydrogen bonding between epoxy and cellulose in the presence of the ionic liquid, leading to partial miscibility between these two polymers. The addition of cellulose improves the tensile mechanical properties of epoxy. This study reveals the use of ionic liquids as a compatible processing medium to prepare epoxy thermosets modified with natural polymers. Fig. 1 The proposed formation of EDA complexes between (a) epoxy/ BMIM[Cl] 22 and (b) cellulose/BMIM[Cl] 23 (the chemical structure of the BMIM[Cl] is given in Scheme S1 †).This journal is

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“…[27][28][29][30] In the case of pyridinium salts, containing electron-withdrawing groups, such as cyano-or 4-pyridinium (viologen derivatives), the formation of ion-pairs can be easily followed by the appearance of (a) charge-transfer band(s) above 300 nm in the UV/Vis spectra. [30] The appearance of charge-transfer bands upon contact ion-pair formation has been observed for a variety of anions, such as iodide, [27,28,30] bromide, [31] sulfite, [31] sulfate, [32] hexacyanoferrate, [32,33] etc. A freshly prepared methanolic solution (26 µ) of tetrakis(pyraziniummethyl)tetramethylcavitand tetrabromide 2a×4Br -shows two maxima in its UV-spectrum: 276 nm and 317 nm (Figure 7).…”

Section: Ion-pairing Of the Initial Componentsmentioning

confidence: 99%

“…This deviation is caused by the presence of a charge-transfer band between sulfonate and pyridinium (Ϸ 290-320 nm). [32] Non-linear fitting of the data yielded K a -values of Ͼ 2·10 6  -1 for the capsules 1 × 2 in methanol and 1 × 2a,b in methanol/water = 1:1 (band at 260-280 nm). [36] Figure 8.…”

Section: K a -Value Determination Of The Capsules 1 ×mentioning

confidence: 99%

The Underestimated Role of Counter Ions in Electrostatic Self‐Assembly:[1+1] Cavitand‐Calix[4]arene Capsules Based on Azinium–Sulfonate Interactions

Oshovsky¹,

Reinhoudt²,

Verboom³

2006

Eur J Org Chem

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The apparent Ka values of the formation of [1+1] cavitand‐calix[4]arene capsules, based on azinium–sulfonate electrostatic interactions, obtained by direct titration experiments are concentration dependent due to the influence of the interaction of the charged capsule components with their initial counterions. 1H NMR and UV dilution experiments, in which this ion‐pairing is excluded, gave Ka‐values larger than 2·106 M–1 in methanol and methanol/water (1:1) for the capsule formation. The capsule encapsulates small guests like methanol, ethanol, etc., as proven by ESI‐MS. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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The colours of charge-transfer complexes of methyl viologen: effects of donor, ionic strength and solvent

Cited by 46 publications

References 24 publications

Spectroelectrochemistry of alternating ambipolar copolymers of 4,4′- and 2,2′-bipyridine isomers and quaterthiophene

Spectroelectrochemistry of alternating ambipolar copolymers of 4,4′- and 2,2′-bipyridine isomers and quaterthiophene

Thermally flexible epoxy/cellulose blends mediated by an ionic liquid

The Underestimated Role of Counter Ions in Electrostatic Self‐Assembly:[1+1] Cavitand‐Calix[4]arene Capsules Based on Azinium–Sulfonate Interactions

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