Poly(propylene imine) dendrimers functionalized with stilbene or 1,4-distyrylbenzene chromophores

Schulz, Andrea; Meier, Herbert

doi:10.1016/j.tet.2007.08.064

Cited by 11 publications

(5 citation statements)

References 85 publications

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“…Density functional theory [Eqs. (25) - (34)] has been used to study the phase behavior of thin hard platelets [ Fig. 10] in three dimensions.…”

Section: Discussionmentioning

confidence: 99%

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Structure and thermodynamics of platelet dispersions

Harnau

2008

Molecular Physics

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Various properties of fluids consisting of platelike particles differ from the corresponding ones of fluids consisting of spherical particles because interactions between platelets depend on their mutual orientations. One of the main issues in this topic is to understand how structural properties of such fluids depend on factors such as the shape of the platelets, the size polydispersity, the orientational order, and the platelet number density. A statistical mechanics approach to the problem is natural and in the last few years there has been a lot of work on the study of properties of platelet fluids. In this contribution some recent theoretical developments in the field are discussed and experimental investigations are described.Comment: 23 pages, 18 figure

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“…Density functional theory [Eqs. (25) - (34)] has been used to study the phase behavior of thin hard platelets [ Fig. 10] in three dimensions.…”

Section: Discussionmentioning

confidence: 99%

“…These structures are well understood by now [25]. Much less attention has been paid to dendrimers consisting of rigid units [26,27,28,29,30,31,32,33,34]. Figure 2 shows the chemical structure of a rigid stilbenoid dendrimer of the third generation which is solely composed of stiff units.…”

Section: Form Factor Of Stilbenoid Dendrimersmentioning

confidence: 99%

Structure and thermodynamics of platelet dispersions

Harnau

2008

Molecular Physics

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“…Low mobility enhances charge capture and quantum efficiency, but it should not be too low or power efficiency would decrease. Thus, a number of oligo( p -phenylenevinylene) dendrimers have been reported as candidates for OLED materials, – including crystalline phases and copolymers (Figure ). – …”

Section: Photophysical Studies: Light-harvesting and Light-driven Pro...mentioning

confidence: 99%

“…Thus, a number of oligo(p-phenylenevinylene) dendrimers have been reported as candidates for OLED materials, [389][390][391] including crystalline phases and copolymers (Figure 19). [392][393][394][395][396][397] Oligo(p-phenylenevinylene)-decorated PPI dendrimers were synthesized, extensively studied, and coated on films by the Meijer group. 398 Dendron-containing copolymers with high molecular weights show that both quantum efficiency and hole injection are significantly enhanced by increasing the dendron generation.…”

Section: Poly(phenylene Vinylene) Dendrimersmentioning

confidence: 99%

Dendrimers Designed for Functions: From Physical, Photophysical, and Supramolecular Properties to Applications in Sensing, Catalysis, Molecular Electronics, Photonics, and Nanomedicine

2010

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“…Apart from the monomers ( n = 1), these oligomers have extremely low quantum yields for E → Z isomerization reactions 14. However, CC bond formations can be observed with high efficiency 14,20,21. Two different reaction types have to be considered, concerted [π 2 s + π 2 s] cycloadditions leading to four‐membered rings and statistical crosslinking processes.…”

Section: Resultsmentioning

confidence: 99%

(E,E,E)‐4,4′‐Distyrylstilbenes – Synthesis, Photophysics, Photochemistry and Phase Behavior

et al. 2008

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The fluorescence quantum yields φ F (n) of oligo[2,5-bis(propyloxy)-1,4-phenylenevinylene]s (1b) reach for the trimer (n = 3) in solution a maximum of 86 %, which is almost twice as high as for the monomer (n = 1) and the octamer or undecamer (n = 8, 11). The latter represent the convergence limit of 46 %. 4-Mono-, 3,4-di-or 3,4,5-trisubstituted terminal phenyl rings in the trimers 6a-f do not lead to calamitic or phasmidic liquid crystals; however, 2,3,4-trisubstitution with IntroductionDue to their interesting electrical, optical and optoelectronic properties, oligo-and poly(1,4-phenylenevinylene)s [OPV and PPV] are a highly attractive class of compounds in organic chemistry and materials science.[1] Already with n Ͼ 3, the parent system 1a is insoluble in organic solvents, so solubilizing alkyl or better alkoxy side chains have to be introduced. Some time ago we prepared the series 1b (n = 1-8, 11, 15) with 2,5-dipropoxy-substituted phenyl rings (Scheme 1). [2][3][4] Increasing numbers n of repeating units in conjugated oligomers lead for various properties P to limiting values which can be matched by the corresponding polymer. This approach can be monotonous, as for the λ max values of absorption and fluorescence of 1b, [2][3][4] but the approach P(n) Ǟ P ϱ can also pass for a certain number nЈ through a maximum and/or a minimum. [1l] An important example is given for the electroluminescence efficiency of 1b which reaches a maximum for n = 3. [5] Earlier studies indicated that the photoluminescence quantum yields φ F should also have a maximum for a certain repeat number n of 1b since φ F = 0.82 for the dimer n = 2 measured in CH 2 Cl 2 is much higher than φ F of a long oligomer chain (φ F ≈ 0.5 for n = 11). [6,7] We determined now the fluorescence quantum yields φ F (n) for the whole series 1b (n = 1-8, 11) and tried to obtain liquid crystals (LC) for those oligomers that have the highest φ F value.[

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Poly(propylene imine) dendrimers functionalized with stilbene or 1,4-distyrylbenzene chromophores

Cited by 11 publications

References 85 publications

Structure and thermodynamics of platelet dispersions

Structure and thermodynamics of platelet dispersions

Dendrimers Designed for Functions: From Physical, Photophysical, and Supramolecular Properties to Applications in Sensing, Catalysis, Molecular Electronics, Photonics, and Nanomedicine

(E,E,E)‐4,4′‐Distyrylstilbenes – Synthesis, Photophysics, Photochemistry and Phase Behavior

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