Preparation and photophysical characterisation of Zn–Al layered double hydroxides intercalated by anionic pyrene derivatives

Gago, Sandra; Costa, Telma; Melo, J. Sérgio Seixas de; Gonçalves, Isabel S.; Pillinger, Martyn

doi:10.1039/b715319h

Cited by 69 publications

(57 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The (SPT/LDH) 8 UTF shows a well-defined red fluorescence anisotropy between the parallel and perpendicular directions to the excitation polarization direction (I VV vs. I VH ) with an anisotropy value (r) of 0.25-0.30 for the in-plane polarized excitation light ( Figure 8a); this value is slightly less than the highest value of 0.4 for the system without macroscopic alignment.…”

Section: Polarized Fluorescence Of the Spt/ldh Utfsmentioning

confidence: 92%

“…To obtain quantitative information about the surface roughness of the as-prepared UTFs the (SPT/LDH) n UTFs were investigated by AFM. The (SPT/LDH) 8 UTF had a smooth surface with a root-mean square roughness of 3.03 nm (Figure 5a), and the roughness increased only slightly when increasing n Figure S1). The thickness of the monolayer was estimated to be ca.…”

Section: Characterization Of the Structure And Morphology Of The Spt/mentioning

confidence: 99%

“…Therefore, LDH materials have attracted considerable interest in both fundamental research and for their practical applications in the areas of functional additives, 3 catalysis, 4 separation processes, 5 and drug delivery. 6 Some photoactive anions, such as perylene, 7 pyrene, 8 rhodamine B, 9 coumarin, 10 and a ruthenium complex 11 have previously been incorporated into LDH systems. The resulting two-dimensional hybrid nanocomposite materials exhibit high-quality photoluminescent properties with improved luminescent efficiency as a result of the host-guest interactions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse

Yan

Wei

et al. 2010

AIChE J.

View full text Add to dashboard Cite

Luminescent ordered ultrathin films (UTFs) based on a sulfonated polythiophene (SPT) and Mg-Al-layered double hydroxide (LDH) nanosheets have been fabricated by the layer-by-layer assembly method. UV-visible absorption and fluorescence spectroscopy showed that there was a stepwise and regular growth of the films with increasing number of deposition cycles. XRD, AFM, and SEM showed that the films had a periodic layered structure with a period of ca. 3.0 nm, and that the thickness can be finely controlled within the range ca. 26-100 nm. The SPT/LDH UTFs show well-defined polarized photoemission with an anisotropy of ca. 0.3, and they show a reversible luminescence response to changes in pH. Periodic density functional theoretical calculations gave a band energy of 1.85 eV for the SPT/LDH system and showed that the valence electrons of SPT can be confined in the energy wells formed by the LDH monolayers, which effectively inhibits both the nonradiative relaxation and the p-p stacking interaction of the polymer chromophores. V

show abstract

Section: Polarized Fluorescence Of the Spt/ldh Utfsmentioning

confidence: 92%

Section: Characterization Of the Structure And Morphology Of The Spt/mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse

Yan

Wei

et al. 2010

AIChE J.

View full text Add to dashboard Cite

show abstract

“…The synthesis, structure and properties of layered double hydroxides (LDHs) have been widely studied in recent years because of their potential applications in catalysis (Cavani et al 1991), ion exchange (Khan and O'Hare 2002), environmental amelioration (Fetter et al 1997) and other areas (Grardin et al 2005;Gursky et al 2006;Gago et al 2008). LDHs consist of positively charged metal hydroxide layers having the composition [M II 1-x M′ III x (OH) 2 ] x+ (M II = Mg, Ca, Co, Ni, Cu, Zn; M′ III = Al, Cr, Fe; 0⋅2 ≤ x ≤ 0⋅33).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structure refinement of layered double hydroxides of Co, Mg and Ni with Ga

Manohara

Kamath

2010

Bull Mater Sci

View full text Add to dashboard Cite

Homogeneous precipitation by urea hydrolysis results in the formation of highly ordered layered double hydroxides of divalent metal ions (Co, Mg, Ni) and Ga. Structure refinement shows that these carbonate containing layered hydroxides crystallize with rhombohedral symmetry (space group R-3m) in the structure of the 3R 1 polytype. An analysis of the structure shows that, coulombic attraction between the layer and interlayer remains invariant in different layered hydroxides, whereas the strength of hydrogen bonding varies. The Ni-Ga LDH has the weakest hydrogen bonding and Co-Ga, the strongest, as reflected by the layer-interlayer oxygen-oxygen distances. The poor polarity of the OH bond in the Ni-Ga hydroxide points to the greater covalency of the (M 2+ /M′ 3+ )-oxygen bond in this compound as opposed to the Co-Ga hydroxide. These observations are supported by IR spectra.

show abstract

“…To apply anionic LDHs to nanocomposite system, preparation of organo-modified LDHs resulting in an increase in gallery spacing is very important because inorganic LDHs and organic polymer matrix are basically incompatible. In the past 20 years, many reports about the intercalation of organic anions into LDHs were discussed [12][13][14][15][16][17]. PET is a semicrystalline polyester with a high melting point and very good mechanical strength, due to the presence of the aromatic ring in the polymeric structure [18].…”

Section: +mentioning

confidence: 99%

Preparation of poly(ethylene terephthalate)/layered double hydroxide nanocomposites by in-situ polymerization and their thermal property

Cui¹,

Jiao²,

Zhao³

et al. 2012

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Terephthalate (TA) intercalated layered double hydroxides (LDHs) were synthesized using hydroxides as raw materials, and poly(ethylene terephthalate) (PET)/LDH nanocomposites with different contents of TA intercalated LDHs were prepared by in-situ polymerization. The structure, morphology and thermal property of PET/LDH nanocomposites were investigated. The TA intercalated LDHs were partially exfoliated and well dispersed in PET matrix. The PET/LDH nanocomposites exhibit enhanced thermal stability relative to pure PET, confirmed by the thermogravimetric analysis results. The results of differential scanning calorimetry suggest that LDH nanoparticles could effectively promote the nucleation and crystallization of PET.

show abstract

Preparation and photophysical characterisation of Zn–Al layered double hydroxides intercalated by anionic pyrene derivatives

Cited by 69 publications

References 67 publications

Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse

Fabrication of an anionic polythiophene/layered double hydroxide ultrathin film showing red luminescence and reversible pH photoresponse

Synthesis and structure refinement of layered double hydroxides of Co, Mg and Ni with Ga

Preparation of poly(ethylene terephthalate)/layered double hydroxide nanocomposites by in-situ polymerization and their thermal property

Contact Info

Product

Resources

About