Polyphenylene Nanostructures

Berresheim, Alexander J.; Müller, Markus; Müllen, Kläus

doi:10.1021/cr970073+

Cited by 635 publications

(459 citation statements)

References 335 publications

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“…As observed with the electrochemical characterization, O cyclization greatly affects E HOMO , with the pyrano pyranyl ring inducing the greatest enhancement of the E HOMO values and thus having the greatest impact on both optical and electrochemical E g values. On the other hand, π extension of the all‐carbon aromatic units ( m= 0, n= 1 and m = n =1) affects both E HOMO and E LUMO , and ultimately triggers a decrease of the E g value, as typically observed for π‐extended PAHs 87, 88, 89. Notably, the solvent effect (toluene) on the wavelength λ for the first allowed electronic transition was also considered in the simulation (Table 4).…”

Section: Resultsmentioning

confidence: 99%

Tailoring Colors by O Annulation of Polycyclic Aromatic Hydrocarbons

Miletić

Fermi

Orfanos

et al. 2017

Chemistry A European J

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The synthesis of O‐doped polyaromatic hydro‐ carbons in which two polycyclic aromatic hydrocarbon sub units are bridged through one or two O atoms has been achieved. This includes high‐yield ring‐closure key steps that, depending on the reaction conditions, result in the formation of furanyl or pyranopyranyl linkages through intramolecular C−O bond formation. Comprehensive photophysical measurements in solution showed that these compounds have exceptionally high emission yields and tunable absorption properties throughout the UV/Vis spectral region. Electrochemical investigations showed that in all cases O annulation increases the electron‐donor capabilities by raising the HOMO energy level, whereas the LUMO energy level is less affected. Moreover, third‐order nonlinear optical (NLO) measurements on solutions or thin films containing the dyes showed very good values of the second hyperpolarizability. Importantly, poly(methyl methacrylate) films containing the pyranopyranyl derivatives exhibited weak linear absorption and NLO absorption compared to the nonlinearity and NLO refraction, respectively, and thus revealed them to be exceptional organic materials for photonic devices.

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Section: Resultsmentioning

confidence: 99%

Tailoring Colors by O Annulation of Polycyclic Aromatic Hydrocarbons

Miletić

Fermi

Orfanos

et al. 2017

Chemistry A European J

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“…Polycyclic Aromatic Hydrocarbons and Circumcoronene Series of Benzenoid are two families of hydrocarbon molecules, such that their structure is consisting of Benzene C 6 H 6 or cycles with length six C 6 by defferent componds. In a series of papers, some properties and more historical details of hydrocarbon molecules are studed [44][45][46][47][48][49][50][51][52][53][54][55][56][57] and some applications of Benzenoid system are presented in many papers [58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74].…”

Section: Resultsmentioning

confidence: 99%

Schultz and Modified Schultz Polynomials of Coronene Polycyclic Aromatic Hydrocarbons

Farahani

2014

ILCPA

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Let G = (V;E) be a simple connected graph. The sets of vertices and edges of G are denoted by V = V(G) and E = E(G), respectively. In such a simple molecular graph, vertices represent atoms and edges represent bonds. The distance between the vertices u and v in V(G) of graph G is the number of edges in a shortest path connecting them, we denote by d (u,v). In graph theory, we have many invariant polynomials for a graph G. In this research, we computing the Schultz polynomial, Modified Schultz polynomial, Hosoya polynomial and their topological indices of a Hydrocarbon molecule, that we call "Coronene Polycyclic Aromatic Hydrocarbons".

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“…1 PAHs, which can be regarded as two-dimensional subsections of graphite, are well defined nanoobjects. [2][3][4][5] They are of particular interest because they form linear, laterally insulated conducting structures, so called nanowires, with a potential application in the field of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Controlling the lateral aggregation of perfluoroalkylated hexa-peri-hexabenzocoronenes

Aebischer

Donnio

et al. 2007

J. Mater. Chem.

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The investigation of two hexa-peri-hexabenzocoronene (HBC) derivatives carrying linear or branched perfluoroalkylated side chains is reported. Polycondensed aromatic hydrocarbons (PAH) such as HBC derivatives are well known to self-organize to form highly ordered monomolecular stacks, which in turn show a concentration-and solvent-dependent lateral aggregation. However, possible applications of self-assembled HBC derivatives require linear, laterally non-aggregated columnar structures. According to powder X-ray diffraction (XRD) and differential scanning calorimetry (DSC), HBC derivatives with linear perfluoroalkylated side chains show liquid crystalline (LC) properties whereas those with branched perfluoroalkylated side chains have an amorphous structure. The stacking behaviour and the lateral aggregation are found to be greatly influenced by changes in the medium, as shown by fluorescence spectroscopy and cryo-scanning electron microscopy (cryo-SEM).

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Polyphenylene Nanostructures

Cited by 635 publications

References 335 publications

Tailoring Colors by O Annulation of Polycyclic Aromatic Hydrocarbons

Tailoring Colors by O Annulation of Polycyclic Aromatic Hydrocarbons

Schultz and Modified Schultz Polynomials of Coronene Polycyclic Aromatic Hydrocarbons

Controlling the lateral aggregation of perfluoroalkylated hexa-peri-hexabenzocoronenes

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