Solvatochromic Properties of an Ammonium Containing Polysilane in Water-Ethanol Binary Mixtures

Seki, Takahiro; Tohnai, Atsushi; Tamaki, Takashi; Kaito, Akira

doi:10.1246/cl.1996.361

Cited by 12 publications

(18 citation statements)

References 11 publications

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“…In this method poly(p-phenethylsilane) is fully chloromethylated, followed by a quaternization using a trialkylamine (15,16). Using this method, polysilanes can be prepared with 95% of the phenethyl substituents being quaternized.…”

Section: Polar Functionalized Polysilanesmentioning

confidence: 99%

“…Using this method, polysilanes can be prepared with 95% of the phenethyl substituents being quaternized. Even though interesting materials are obtained, the occurrence of an additional long wavelength band in the fluorescence emission spectrum represents an inherent disadvantage (16). This band is likely to originate from defects that are introduced during the chloromethylation step.…”

Section: Polar Functionalized Polysilanesmentioning

confidence: 99%

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Non-Ionic Water-Soluble Polysilanes and Polysilynes, Chameleons in Solution

Cleij

King

Jenneskens

2000

Stimuli-Responsive Water Soluble and Amphiphilic Polymers

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By incorporating non-ionic oligo(oxyethylene) and crown ether containing substituents, previously inaccessible water soluble linear polysilanes [SiRR'] n and branched polysilynes [SiR] n have been prepared. Their remarkable σ-conjugation related properties are a sensitive probe for silicon backbone conformation. In aqueous solution at ambient temperatures the polymers appear to be dissolved in a highly folded random coil. At the lower critical solution temperature (LCST; 45-50°C) the solution becomes turbid and the polymers aggregate in a more extended conformation. This temperature-induced formation of ordered particles shows remarkable metal cation responsiveness.Polysilanes -(SiRiR 2 ) n -are one-dimensional polymers with an a//-silicon backbone and organic substituents (Ri, R 2 ) (/). They attract considerable attention due to their remarkable optical and electronic properties, which differ considerably from their related a//-carbon analogues, as a result of the occurrence of σ-conjugation (2). The degree of σ-conjugation, which is strongly dependent on the conformation of the silicon backbone, markedly affects these properties. As a result, a variety of useful electrical and optical properties are found. Examples of these properties include hole-and photoconduction, 238

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Section: Polar Functionalized Polysilanesmentioning

confidence: 99%

Section: Polar Functionalized Polysilanesmentioning

confidence: 99%

Non-Ionic Water-Soluble Polysilanes and Polysilynes, Chameleons in Solution

Cleij

King

Jenneskens

2000

Stimuli-Responsive Water Soluble and Amphiphilic Polymers

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“…These optical properties are anticipated to shed light on the main chain orientation and conformational states. We have recently developed a series of ammonium-containing polysilanes. − The materials having a long alkylammonium moiety, like other chemically functionalized polysilanes, − are amphiphilic and found to be successfully assembled as multilayers by the ordinary LB technique. − On the other hand, a compound with a trimethylammonium group (APS, Chart ) becomes water-soluble, , and this material would be used as the polyelectrolyte component in the polyion complex LB films.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20] The materials having a long alkylammonium moiety, like other chemically functionalized polysilanes, [21][22][23] are amphiphilic and found to be successfully assembled as multilayers by the ordinary LB technique. [18][19][20] On the other hand, a compound with a trimethylammonium group (APS, Chart 1) becomes water-soluble, 24,25 and this material would be used as the polyelectrolyte component in the polyion complex LB films.…”

Section: Introductionmentioning

confidence: 99%

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Polyion Complex Langmuir−Blodgett Layers Containing an Ionic Water-Soluble Polysilane

et al. 1997

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Monolayers of anionic amphiphiles, arachidic acid (C19COOH) and a double long chain sulfonic acid derivative (2C12SO3Na), were spread on the water subphase containing an ammonium-containing polysilane (APS), and Langmuir−Blodgett (LB) films from these polyion complex monolayers were prepared. Single layer deposition of these polyion complex monolayers was successfully achieved onto a hydrophilic substrate under all conditions examined, but multilayers could be prepared under limited conditions in the Z-type mode. The UV absorption spectra of the transferred C19COO(H)/APS monolayers indicated that the conformational state of APS in the films are dependent on the subphase pH. The absorbance of the transferred LB films confirmed that the APS is incorporated monomolecularly on the lifting process. Polarized UV absorption spectra revealed no preferential orientation of the APS backbone in the LB films. The multilayers formed in the Z-type deposition were eventually inverted to stacked bilayer structure (Y-type layers) after aging and successive annealing, as proven by the small angle X-ray reflectometry. LB films composed of 2C12SO3 -/APS possessed a more refined layer structure with a more smooth surface than those of C19COO(H)/APS, probably due to a better dimensional matching of the APS unit and the cross section of the amphiphile. Finally, structural features of the C19COO(H)/APS polyion complex LB film were discussed in comparison with those of a homologous amphiphilic material reported previously (Seki et al. Macromolecules 1995, 28, 5609).

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Sonochemical synthesis of novel blue‐emissive, water‐soluble, cationic polysilanes as fluorescent sensors

Wang

Fan

Cheng

et al. 2006

J. Polym. Sci. A Polym. Chem.

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The design, synthesis, and characterization of novel blue‐emissive, cationic, water‐soluble, conjugated polymers based on polysilanes with amino‐terminal groups are described. Water solubility was realized through the quaternization of the amino group to control the cationic degree, which in turn determined the solubility of the polymers in organic solvents and water. The sonochemical synthesis and 2,2′‐azobisisobutyronitrile assistant hydrosilylation reaction well maintained the polysilane molecular weights and polydispersities. A redshift of the absorption and photoluminescence spectra in solutions was distinctly observed with increasing solvent polarity. The water‐soluble polysilanes had better thermal and UV light stability. Before and after quaternization, the polymers showed acceptable photoluminescence quantum yields in solutions. The flexible main chains of the polysilanes, increasing the conformational freedom, adhered tightly to the secondary structure of the analyte, resulting in improved Förster‐resonance‐energy‐transfer efficiencies. These polymers could be highly sensitive and selective materials for chemo‐ and biosensors. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3513–3525, 2006

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Solvatochromic Properties of an Ammonium Containing Polysilane in Water-Ethanol Binary Mixtures

Cited by 12 publications

References 11 publications

Non-Ionic Water-Soluble Polysilanes and Polysilynes, Chameleons in Solution

Non-Ionic Water-Soluble Polysilanes and Polysilynes, Chameleons in Solution

Polyion Complex Langmuir−Blodgett Layers Containing an Ionic Water-Soluble Polysilane

Sonochemical synthesis of novel blue‐emissive, water‐soluble, cationic polysilanes as fluorescent sensors

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