Excited State Dynamics in the Structural Characterization of Solid Alkyltrimethoxysilane-Derived Sol-Gel Films and Glasses Containing Bound or Unbound Chromophores

Chambers, R. Carlisle; Haruvy, Y.; Fox, Marye Anne

doi:10.1021/cm00044a038

Cited by 41 publications

(36 citation statements)

References 1 publication

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“…However, a trend is noticed for the change in F as a function of the type of alkyl group that is introduced, i.e., for the same concentration of Si(OR)aR' the change in F is larger as the alkyl chain length increases. This is in accordance with Chambers et al result [11]. He also noticed a modest decrease in polarity by increasing the alkyl chain length for pyrene containing coatings prepared with an acid catalysed sol-gel process.…”

Section: Resultssupporting

confidence: 91%

“…The SiO2-film made from a solution with low acidity (0.005M HC1) is more rigid than the one with the higher acidity. This rigidity can probably be correlated to the cage dimension [11].…”

Section: Resultsmentioning

confidence: 97%

“…Emission anisotropy experiments [5][6][7][8][9][10]11] were carried out with a SLM-8000 C spectrofluorometer in L-format, correcting for polarisation bias in the detection system. Films were monitored in the fluorometer in a sample compartment configured so that the excitation light was at an angle of 45 ~ to the sample surface.…”

Section: Methodsmentioning

confidence: 99%

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Fluorescence of pyranine in sol-gel based silica and hybrid thin films

Wittouck

Schryver

Snijkers-Hendrickx

1997

J Sol-Gel Sci Technol

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Abstract. The sensitivity of the pyranine fluorescence to protonation/deprotonation is used to follow modifications in cured sol-gel thin films. The acid concentration in the sol-gel solution is varied for TEOS-based coatings and a series of organically modified silanes Si(OR)3R' are added to the TEOS solution. The concentration of the organically modified silane is varied as well as the chain length of the alkylgroup (R').The stationary fluorescence measurements show that the equilibrium between the protonated and the deprotonated form of pyranine changes depending on the type of silica matrix. The deprotonated form is dominant in the cured SiO2 films and the protonation/deprotonation ratio of pyranine is constant for the different acid concentrations used. The protonated form becomes dominant as the concentration of Si(OR)3R' is increased and as the alkyl chain length (W) of the organically modified silanes is augmented.Emission anisotropy measurements of pyranine in the same coatings show that the rotational freedom of the molecule changes due to modifications in the cages for the TEOS-based coatings. These modifications are produced by the acid concentration used to prepare the coatings. An increase in the rotational freedom of pyranine is observed in the TEOS-Si(OR)3R' systems.

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Section: Resultssupporting

confidence: 91%

“…The SiO2-film made from a solution with low acidity (0.005M HC1) is more rigid than the one with the higher acidity. This rigidity can probably be correlated to the cage dimension [11].…”

Section: Resultsmentioning

confidence: 97%

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Fluorescence of pyranine in sol-gel based silica and hybrid thin films

Wittouck

Schryver

Snijkers-Hendrickx

1997

J Sol-Gel Sci Technol

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“…H-TES, MeTES) [3,4] make them more hydrophobic or less polar. The polarity of the surface of these organo-modified gels becomes lower than that corresponding to the unmodified material and is also a function of the length of the alkyl or aryl groups that are involved [5].…”

Section: Introductionmentioning

confidence: 96%

Macrocycle–pore network interactions: Aluminum tetrasulfophthalocyanine in organically modified silica

Gonzalez-Santiago

García-Sánchez

2011

Journal of Non-Crystalline Solids

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“…Indeed, these materials have recently been investigated and shown to have enormous potential for NLO applications [33][34][35]. The flexible solution chemistry and the ease with which materials in various configurations (e.g., films, fibers, monoliths) can be prodessed are particularly important in the development of practical devices.…”

Section: Optical Applicationsmentioning

confidence: 99%

Analytical applications of organically modified silicates

Collinson

1998

Mikrochim Acta

123

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Abstract. Inorganic-organic hybrid materials prepared by the sol-gel process have become an attractive field of study due to the immense versatility associated with this method of composite material preparation. The blending of inorganic precursors with organosilicon reagents enables unique materials to be fabricated with the desired chemical and physical characteristics. The ability to control the interfacial polarity, the degree of porosity, and the chemical functionality in the matrix has been shown to be a powerful tool in the design of materials for sensor, optical, chromatographic, and catalytic applications. In this review, the preparation of the organically modified silicates (ORMOSILs) where the individual precursors are covalently bound to each other is discussed and selected examples of their potential usefulness in analytical applications is presented.

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Excited State Dynamics in the Structural Characterization of Solid Alkyltrimethoxysilane-Derived Sol-Gel Films and Glasses Containing Bound or Unbound Chromophores

Cited by 41 publications

References 1 publication

Fluorescence of pyranine in sol-gel based silica and hybrid thin films

Fluorescence of pyranine in sol-gel based silica and hybrid thin films

Macrocycle–pore network interactions: Aluminum tetrasulfophthalocyanine in organically modified silica

Analytical applications of organically modified silicates

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