In situ synthesis of fluorescent poly(norbornene)/oxazine-1 dye loaded fluoromica hybrids: supramolecular control over dye arrangement

Leone, Giuseppe; Giovanella, Umberto; Porzio, William; Botta, Chiara; Ricci, Giovanni

doi:10.1039/c1jm11281c

Cited by 17 publications

(21 citation statements)

References 55 publications

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“…The sample profiles have been treated according to Enzo et al [ 21 ] to derive relevant parameters reported in Table 1 . As reported on our previous works [ 8 – 9 ], SME shows two diffraction peaks at 7.30 and 9.40°, corresponding to the interlayer spacing of 1.22 and 0.95 nm of hydrated and dehydrated layers, respectively, while for DHS (dehydrated SME) only the peak at about 9.40° [ d (001) = 0.95 nm] is observed.…”

Section: Resultssupporting

confidence: 74%

“… a The XRD data for SME and DHS, reported in [ 9 ], are added to help the comparison with the TF-intercalated samples. Peaks other than those indicated observed in the patterns are possibly attributable to a mixed reflection of fluoromica [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…5.88°, and a second one at about 7.1°. The former (marked with an asterisk and equivalent to pristine SME [ 9 ]) stems from the layer which retains water molecules (meaning that the cation-exchange is incomplete), while the latter reflection, shifted to lower a Bragg angles compared to SME (7.30°), is associated with a layer repetition of 1.46 nm ( d -free value of 0.51 nm) thus suggesting that the TF cation is intercalated in between the SME galleries. To propose a reasonable interlayer arrangement of TF molecules, the steric limitations between TF and the SME charged sites should be examined.…”

Section: Resultsmentioning

confidence: 99%

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Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

Leone

Galeotti

Porzio

et al. 2014

Beilstein J. Nanotechnol.

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SummaryWe report on the intercalation of a cationic fluorescent oligo(fluorene) in between the 2D interlayer region of a fluoromica type silicate. The formation of intercalated structures with different fluorophore contents is observed in powders by synchrotron radiation XRD. Successively, the hybrids are dispersed in poly(styrene) through in situ polymerization. Such a procedure allows us to synthesize the materials from solution, to achieve solid films, and to characterize them by optical and morphologic techniques. The polymeric films with homogeneous distribution of the hybrids exhibit ultraviolet–blue photoluminescence with a significantly enhanced photostability compared to the bare oligo(fluorene)s. Finally, under specific conditions, the polymer hybrid with higher oligo(fluorene) content spontaneously assembles into highly ordered microporous films.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

Leone

Galeotti

Porzio

et al. 2014

Beilstein J. Nanotechnol.

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“…Comparison with recent spectroscopic investigations of different Ox1 + composites reported by Botta et al allows the conclusion that the new band is caused by Jaggregate formation at the outer surface of the ZL host, probably close to the channel entrance. 57,58 The latter point is a hypothesis that we cannot prove at the present time. A number of similar Ox1 + ,perylene−ZL composites have been prepared and analyzed, allowing us to say that the data shown in Figure 9A is representative and can be regarded as typical.…”

Section: −48mentioning

confidence: 83%

Self-Absorption and Luminescence Quantum Yields of Dye-Zeolite L Composites

et al. 2013

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Electronic absorption and fluorescence spectra based on transmission measurements of thin layers obtained from new perylene−zeolite L composites and new dye1,dye2−zeolite L sandwich composites, the latter acting as antenna systems, have been investigated and analyzed. The influence of extra-and intraparticle self-absorption on the spectral shape and fluorescence quantum yield is discussed in detail. Due to its intraparticle origin, self-absorption and re-emission can often not be avoided in organized systems such as dye−zeolite L composites where a high density of chromophores is a prerequisite for obtaining the desired photophysical properties. We show, however, that it can be avoided or at least minimized by preparing dye1,dye2−zeolite L sandwich composites where donors are present in a much larger amount than the acceptors because they act as antenna systems. ■ INTRODUCTIONComposites synthesized by embedding molecules, complexes, and clusters into the one-dimensional channels of zeolite L (ZL) 1,2 have recently experienced increasing interest from scientists engaged in different fields, ranging from very stable nontoxic pigments to novel optical materials with a large variety of different properties to promising objects for utilization in analytics, biology, diagnostics and drug delivery. This trend is exemplified by publications that appeared in 2013. 3−16 Electronic absorption and luminescence spectroscopy are important tools for characterizing the host−guest composites, and luminescence is often one of their key properties. Confocal luminescence microscopy on individual crystals has successfully been used and has contributed much to our current understanding of various dye−ZL properties. 17−23 It is very often desirable to measure absorption and luminescence spectra of an ensemble in order to unambiguously interpret the observations and sometimes to derive luminescence quantum yields. Diffuse reflectance spectroscopy has frequently been used in the case for which this sophisticated instrumentation has been developed. 10,24 Advancing dye−ZL research requires measurements that not only yield spectra and quantum yields as numbers but also provide information useful for understanding the mechanisms behind the observed phenomena. A prerequisite for these are high quality absorption and luminescence spectra where the band shapes can be interpreted unambiguously. This is best guaranteed if high quality transmission spectra are available. We have therefore successfully applied refractive index matching techniques in order to reduce or in favorable cases eliminate light scattering. We have used dispersions in liquid solvents or polymers as matrixes for dye−ZL composites, where sometimes a surface modification of the ZL crystals was required.25−27 More recently, a method for the preparation of thin oil−glass sandwiches (OGS) from dye−ZL composites has been employed. 15,20 This technique has proven to be very convenient and allows differentiating between mechanisms that affect the shape of the absorptio...

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“…[10] BABPs may indeed behave as host systems to be exploited for the recognition of a variety of molecules in aqueous solution, with multiple potential applications in environmental and industrial chemistry. [11] The two most extensively characterised BABPs, namely, human ileal BABP and chicken liver BABP, share the common property of having two available binding sites for bile salts. [2,[12][13][14] Human ileal BABP was shown to display a nearly complete site selectivity for glycocholic (GCA) and glycochenodeoxycholic (GCDA) acids, [15] the main components of the natural bile acid pool, differing only in the presence of a hydroxyl group at position 12 of the sterol moiety (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

A Disulfide Bridge Allows for Site‐Selective Binding in Liver Bile Acid Binding Protein Thereby Stabilising the Orientation of Key Amino Acid Side Chains

Tomaselli

Assfalg

Pagano

et al. 2012

Chemistry A European J

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The presence of a disulfide bridge in liver bile acid binding protein (L-BABP/S-S) allows for site-selective binding of two bile acids, glycochenodeoxycholic (GCDA) and glycocholic acid (GCA), differing only in the presence of a hydroxyl group. The protein form devoid of the disulfide bridge (L-BABP) binds both bile salts without discriminating ability. We investigate the determinants of the molecular recognition process in the formation of the heterotypic L-BABP/S-S complex with GCDA [corrected] and GCA [corrected] located in the superficial and inner protein sites, respectively. The comparison of the NMR spectroscopy structure of heterotypic holo L-BABP/S-S, the first reported for this protein family, with that of the homotypic L-BABP complex demonstrates that the introduction of a S-S link between adjacent strands changes the conformation of three key residues, which function as hot-spot mediators of molecular discrimination. The favoured χ(1) rotameric states (t, g(+) and g(-) for E99, Q100 and E109 residues, respectively) allow the onset of an extended intramolecular hydrogen-bond network and the consequent stabilisation of the side-chain orientation of a buried histidine, which is capable of anchoring a specific ligand.

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In situ synthesis of fluorescent poly(norbornene)/oxazine-1 dye loaded fluoromica hybrids: supramolecular control over dye arrangement

Cited by 17 publications

References 55 publications

Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

Self-Absorption and Luminescence Quantum Yields of Dye-Zeolite L Composites

A Disulfide Bridge Allows for Site‐Selective Binding in Liver Bile Acid Binding Protein Thereby Stabilising the Orientation of Key Amino Acid Side Chains

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