Composites of Perylene Chromophores and Layered Double Hydroxides: Direct Synthesis, Characterization, and Photo‐ and Chemical Stability

Bauer, Johann; Behrens, Peter; Speckbacher, Markus; Langhals, Heinz

doi:10.1002/adfm.200390036

Cited by 142 publications

(96 citation statements)

References 33 publications

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“…Most of the molar ratios of Mg:Al deviate from the initial value of 2.0 and tend to be around 2.3, which may be attributed to the difference in the dissolution equilibrium between Mg(OH) 2 and Al(OH) 3 during the hydrothermal synthesis. [ 20 ] The fi nal experimental ratio of AQS:DDS anions ( x ) is about half of the initial nominal ratio before 16.67 and is close to the initial nominal ratio after 16.67. However, the upward trend in fi nal x upon the increase of the initial AQS concentration holds throughout the whole concentration range as expected.…”

Section: Introductionmentioning

confidence: 85%

Tris(8‐hydroxyquinoline‐5‐sulfonate)aluminum Intercalated Mg–Al Layered Double Hydroxide with Blue Luminescence by Hydrothermal Synthesis

Wei

et al. 2010

Adv Funct Materials

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Blue luminescent hybrid materials (DDS-AQS( x %)/LDH) are successfully prepared by co-intercalating tris(8-hydroxyquinoline-5-sulfonate)aluminum anions (AQS 3 − ) and dodecyl sulfonate (DDS − ) with different molar ratios into Mg-Al layered double hydroxides (LDHs) by the hydrothermal and solution co-precipitation methods. A fi lm of the material on a quartz substrate is obtained by the solvent evaporation method. The results show the blue luminescence is remarkably different from the pristine Na 3 AQS, which has cyan luminescence (ca. 450-470 nm vs. 495 nm). Furthermore, the hydrothermal product of DDS-AQS(66.67%)/LDH exhibits optimal luminous intensity and a signifi cantly enhanced fl uorescence lifetime. Nuclear magnetic resonance and Fourier-transform infrared spectroscopy indicate that the cyan-blue luminescence transition is due to the isomerization of meridianal to facial AQS via ligand fl ip caused by a host-guest electrostatic interaction, in combination with the dispersion and pre-intercalation effect of DDS. The hydrothermal conditions can promote a more ordered alignment of the intercalated fac -AQS compared with alignment in the solution state, and the rigid LDHs environment can confi ne the internal mobility of AQS to keep the facial confi guration stable. This stability allows a facile preparation of large amounts of blue luminous powder/fi lm, which is a new type of inorganic-organic hybrid photofunctional material.

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Section: Introductionmentioning

confidence: 85%

Tris(8‐hydroxyquinoline‐5‐sulfonate)aluminum Intercalated Mg–Al Layered Double Hydroxide with Blue Luminescence by Hydrothermal Synthesis

Wei

et al. 2010

Adv Funct Materials

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“…The samples were hydrothermally treated using microwave heating (8 hrs with a step-wise increase in temperature from 120 up to 180°C and a corresponding pressure of 2-10 bar). The crystalline phases were characterized by X-ray diffraction [20].…”

Section: Methodsmentioning

confidence: 99%

“…The LDH was characterized by XRD according to literature [20]. The XRD data between 2 and 70°, were recorded at 0.5°/min, using …”

Section: Characterizationmentioning

confidence: 99%

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Kumar¹,

Rana²,

Singh³

2007

Express Polym. Lett.

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Abstract. The photo-oxidation of ethylene propylene diene monomer (EPDM)/ layered double hydroxide (LDH) composites as well as EPDM/LDH with stabilizers is studied under accelerated UV irradiation (λ ≥ 290 nm) at 60°C for different time intervals. The development of functional groups during oxidation was monitored by FT-IR spectroscopy. The photodegradation of the pristine polymer and composites take place and the increase in hydroxyl and carbonyl groups with irradiation times, was estimated. EPDM filled LDH showed higher degradation rate than pristine EPDM, while in acidic medium EPDM/LDH showed almost equal degradation as in isolated conditions. These results show the advantages of LDHs as a filler as well as an acid killer. The effect of stabilizers is very less because of their concentration in comparison of LDH.

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“…The chromophore molecules are stacked in J-type aggregates in the galleries between the hydroxide layers which increases chemical and photostability. [52] Penner and co-workers stabilized the Jaggregates of cyanine dyes at the molecular level by appending them to a polylysine backbone and constructing layer-by-layer assemblies with inorganic clay sheets. These three-dimensional structures have potential applications as layered systems for optical energy transfer and antenna systems.…”

Section: Inorganic Matricesmentioning

confidence: 99%

Improving the Properties of Organic Dyes by Molecular Encapsulation

2005

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There is a demand for new methods of protecting organic dyes from aggregation effects and photochemical degradation. The purpose of this microreview is to summarize the recent attempts to improve the properties of dyes by molecular encapsulation. Organic dyes have been encapsulated inside inorganic matrices such as molecular sieves, and molecular containers such as cyclodextrins, cucurbiturils, dendrimers, and self-assembled gels. Another strategy is perma- IntroductionOrganic chromophores such as cyanines, squaraines, azo dyes and perylenediimide dyes are widely used as pigments in many commercial products. They are active ingredients in semiconducting materials, [1] textile products, [2] laser materials, [3] optical disks, [4] paints, [5] and probes for biological systems.[6] Modern research on organic dyes includes investigations of building blocks for conjugated polymers, hydrogen bonded assemblies, chromogenic sensors, molecular shuttles, solar energy cells, photonics and various approaches to photodynamic therapy. [7][8][9][10][11] A common limitation with organic dyes, especially those with long-wavelength absorption bands, is their susceptibility to chemical and photochemical degradation. The reason for the enhanced reactivity is the inherently small HOMO-LUMO energy gap, which means that the dyes are potentially reactive with both nucleophiles and electrophiles. Another potential drawback with organic dyes is their tendency to aggregate, which induces multichromophoric interactions that alter the color quality and quench the photoluminescence. In principle, these problems can be attenuated by supramolecular encapsulation strategies that isolate the individual dye molecules and prevent self-aggregation or similar interactions with the chemical environment. The purpose of this microreview is to summarize the recent literature on meth- Germany, 2005) ods to improve the properties of organic dyes by molecular encapsulation. The focus is on relatively "robust" molecular containers and does not include "soft" assemblies like micelles, emulsions or vesicles.

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Composites of Perylene Chromophores and Layered Double Hydroxides: Direct Synthesis, Characterization, and Photo‐ and Chemical Stability

Cited by 142 publications

References 33 publications

Tris(8‐hydroxyquinoline‐5‐sulfonate)aluminum Intercalated Mg–Al Layered Double Hydroxide with Blue Luminescence by Hydrothermal Synthesis

Tris(8‐hydroxyquinoline‐5‐sulfonate)aluminum Intercalated Mg–Al Layered Double Hydroxide with Blue Luminescence by Hydrothermal Synthesis

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Improving the Properties of Organic Dyes by Molecular Encapsulation

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