The use of optical brighteners for synthetic fibers in detergents

Anliker, R.; Hefti, Heinz; Kasperl, H.

doi:10.1007/bf02541212

Cited by 5 publications

(4 citation statements)

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“…The crystallinity was confirmed by a clear electron diffraction spectrum ( Figure S7). Samples of the butyl (4 and 5) and octyl (6) derivatives also revealed the presence of microcrystals, which often seemed to be composed of smaller crystals stacked together. The methyl (2) and methoxy (3) derivatives led to regular, acicular structures, which surprisingly hardly fixed the contrasting agent.…”

Section: Observations By Transmission Electronmentioning

confidence: 99%

“…Samples 1 and 4À6 gave microcrystals. These microcrystals measured up to 50 μm for compounds 1 and 4 (Figures 4 and S5), only 10 μm for the t-butyl derivative 5 (many of them being twinned, Figure S5), and even less for the octyl derivative (6), with a tendency to agglomerate. In contrast, the methoxy and methyl derivatives spontaneously organized in nano-/microfibers (Figures 4 and S4), which measured several tens of micrometers.…”

Section: Observations By Fluorescence Microscopymentioning

confidence: 99%

“…The 2-phenyl-benzoxazole series was chosen for the following reasons: (i) Compounds of this family show excellent fluorescence properties when dissolved in organic solvents or dispersed in a matrix. They serve as near-UV dyes in many applications, such as scintillation counters, laser dyes, optical brighteners for textiles, and biological probes . (ii) The photophysical behavior, studied in solution, is well-known. ,, (iii) Curiously, to our knowledge, solid-state spectroscopic properties in the 2-phenyl-benzoxazole series have hardly been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

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Facile Access to Highly Fluorescent Nanofibers and Microcrystals via Reprecipitation of 2-Phenyl-benzoxazole Derivatives

Ghodbane¹,

D’Altério²,

Saffon³

et al. 2011

Langmuir

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2-Phenyl-benzoxazole and five derivatives bearing an alkyl or alkoxy substituent on the phenyl ring were used to prepare aqueous suspensions of particles via a solvent-exchange method. In these conditions, the methyl and methoxy derivatives spontaneously gave nanofibers, while the other compounds led to microcrystals. This shows that minor chemical changes are enough to direct the formation of a given type of particle. From a spectroscopic viewpoint, all compounds strongly emit blue light in the solid state, with spectra much broader than those registered in n-heptane and ethanol solutions. The photoluminescence quantum yields reached 38% and were slightly affected in aqueous suspension by the polarity of the environment. The molecular arrangement, deduced from X-ray analysis for the methyl and methoxy derivatives, was used to explain the fluorescence properties in the solid state. This work shows that 2-phenyl-benzoxazole derivatives are interesting candidates for applications as fluorescent nanomaterials, including in aqueous and biological media.

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Section: Observations By Transmission Electronmentioning

confidence: 99%

Section: Observations By Fluorescence Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile Access to Highly Fluorescent Nanofibers and Microcrystals via Reprecipitation of 2-Phenyl-benzoxazole Derivatives

Ghodbane¹,

D’Altério²,

Saffon³

et al. 2011

Langmuir

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“…This dye family encompasses two types of isomers, depending on the way the naphthalene group is merged with the oxazole ring. The [1,2-d] isomer enters in the composition of optical waveguiding materials, [12] it is a precursor of dyes for textile fibers, [13] optical brighteners, [14] photopolymerization sensitizers, [15] and it is used as scintillator for b-counting. [16] Regarding the [2,3-d] isomer, which is the object of this study, the 2'-hydroxy derivative is a chelating agent that acts as ancillary ligand in heteroleptic Ir III complexes, to give highly efficient yellow phosphorescent devices usable in organic lightemitting diodes.…”

Section: Introductionmentioning

confidence: 99%

Blue‐Emitting Nanocrystals, Microcrystals, and Highly Oriented Nanofibers Prepared by Reprecipitation and Solvent Drop‐Casting of 2‐Phenyl‐naphthoxazoles

Ghodbane¹,

Colléaux²,

Saffon³

et al. 2012

ChemPlusChem

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Three 2‐phenyl‐naphth[2,3‐d]oxazole derivatives, one of them being unsubstituted (1) and the two others bearing a methyl (2) and a tert‐butyl group (3) in the para position of the phenyl ring, were prepared. In the crystalline state, all compounds adopted a crossed‐stacking mode that favors fluorescence emission. They emitted in the blue region and their photoluminescence quantum yield ranged between 25 and 59 %. The preparation of micro/nanoparticles by simple methods was optimized. By using a solvent‐exchange method, the compounds readily gave microcrystals, the size and shape of which closely depend on the nature of the substituent, as well as nanocrystals that measured around 200 nm. The proportion of micro‐ and nanocrystals was modulated by the experimental conditions and the two populations could be separated by filtration for subsequent use. For unsubstituted compound 1, drop‐casting from a solution in tetrahydrofuran spontaneously generated an array of parallel and almost perpendicularly oriented nanofibers that exhibited efficient waveguiding properties. Owing to their robustness, good solid‐state optical properties, and to the simplicity of particle preparation, these naphthoxazole derivatives appear as promising candidates for the fabrication of blue‐emitting tracers and nanofibers.

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