Polarized Absorption and Emission of Ordered Self-Assembled Porphyrin Rings

Jeukens, Cécile R. L. P. N.; Lensen, Marga C.; Wijnen, Frans J. P.; Elemans, Johannes A. A. W.; Christianen, Peter C. M.; Rowan, Alan E.; Gerritsen, Jan W.; Nolte, Roeland J. M.; Maan, J. C.

doi:10.1021/nl049363d

Cited by 51 publications

(32 citation statements)

References 30 publications

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“…We note that the formation of ring-like microstructures has been observed also from solutions of other organic molecules like porphyrin on coated glass after evaporation of the solvent. [37][38][39][40] Because low energy electron diffraction does not provide diffraction patterns for the ring samples we use optical methods to learn more about the rings microscopic structure. Polarized fluorescence measurements are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Nanoaggregates from oligothiophenes and oligophenylenes: a systematic growth survey

et al. 2005

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The growth of nanoscopic oligophenylene and oligothiophene aggregates on muscovite mica by vacuum deposition has been investigated. In the case of para-phenylenes a dipole assisted self assembly generation of needle-like aggregates is observed on mica. At optimum fiber growth temperature phenylene aggregates grow in most cases without a layer of upright oriented molecules. In contrast, vacuum deposition of oligothiophenes results simultaneously in fibers of laying molecules as well as islands of upright molecules. Since both phenylenes and thiophenes are strongly polarizable but differ in the lattice parameters of the resulting crystalline overlayers a direct comparison between the two classes of molecules allows us to study the role of epitaxy on the growth of nanoaggregates. Besides straight aggregates we also observe thiophene rings on water and methanol treated mica surfaces, which consist of radially oriented, laying molecules.

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Section: Resultsmentioning

confidence: 99%

Nanoaggregates from oligothiophenes and oligophenylenes: a systematic growth survey

et al. 2005

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“…Among porphyrins, especially the water‐soluble meso ‐tetrakis(4‐sulfonatophenyl)‐porphyrin (TPPS) shows interesting aggregation behavior and photophysical properties . For example, the porphyrin dianion (H 2 TPPS 2− ) forms highly organized J‐ and H‐aggregates at very low pH or in the presence of various inorganic and organic cations, which exhibit a strong nonlinear optical response and fast energy transfer within the aggregates . TPPS has also been used as building block for structure formation, for example, with cyanine dyes, chiral metal complexes, photoactive microcapsules, and peptides …”

Section: Introductionmentioning

confidence: 99%

Porphyrin-Polyelectrolyte Nanoassemblies: The Role of Charge and Building Block Architecture in Self-Assembly

Frühbeißer

Gröhn

2017

Macromol. Chem. Phys.

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In this study, the self‐assembly of ionic porphyrins and polyelectrolytes in dependence on the polyelectrolyte architecture and molecular mass is investigated systematically. The systems consist of tetravalent anionic meso‐tetrakis(4‐sulfonatophenyl)‐porphyrin (TPPS), which is combined with different positively charged macroions: poly(amidoamine) dendrimer of generation 4, linear polylysine of different molecular masses, poly(diallyldimethylammonium chloride), and a cylindrical poly‐l‐lysine brush. Light scattering reveals defined supramolecular assemblies with hydrodynamic radii between RH = 30 nm and RH = 180 nm. Further, size and shape of TPPS–polyelectrolyte assemblies are substantially affected by the polyelectrolyte architecture but less by the molecular mass of the polyelectrolyte. ζ‐potential measurements detect an assembly charge corresponding to the excess component that is responsible for the aggregate being stable in solution.

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“…To get more information about the orientation of the deposited molecules within the rings, their optical properties were investigated with the help of polarized fluorescence spectroscopy and near-field scanning optical microscopy (NSOM; figure 20b,c; Jeukens et al 2004;Lensen et al 2004b). Upon excitation of the rings with polarized light in a vertical direction, emission was mainly observed at the sides of the rings (figure 18b).…”

Section: Alignment Layers By Self-assembly Of Molecules At a Surfacementioning

confidence: 99%

The development of self-assembled liquid crystal display alignment layers

Hoogboom

Elemans

Rowan

et al. 2007

Phil. Trans. R. Soc. A.

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From simple pocket calculators to mobile telephones and liquid crystal display (LCD)-TV, over the past few decades, devices based on LCD technology have proliferated and can now be found in all conceivable aspects of everyday life. Although used in cutting-edge technology, it is surprising that a vital part in the construction of such displays, namely the alignment layer, relies essentially on a mechanical rubbing process, invented almost 100 years ago.In this paper efforts to develop alignment layers (also called command layers) by processes other than rubbing, namely self-assembly of molecular and macromolecular components will be discussed. Two topics will be presented: (i) tuneable command layers formed by stepwise assembling of siloxane oligomers and phthalocyanine dyes on indium tin oxide surfaces and (ii) command layers formed by self-assembly of porphyrin trimers. The potential use of these layers in sensor devices will also be mentioned.

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Polarized Absorption and Emission of Ordered Self-Assembled Porphyrin Rings

Cited by 51 publications

References 30 publications

Nanoaggregates from oligothiophenes and oligophenylenes: a systematic growth survey

Nanoaggregates from oligothiophenes and oligophenylenes: a systematic growth survey

Porphyrin-Polyelectrolyte Nanoassemblies: The Role of Charge and Building Block Architecture in Self-Assembly

The development of self-assembled liquid crystal display alignment layers

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