Solid state photopolymerization of modified amphiphilic diynes in multilayers

Алексеев, А. С.; Domnin, I. N.; Grudinin, A. L.; Lemmetyinen, Helge; Nikitenko, A. V.

doi:10.1002/1521-3935(20000801)201:12<1317::aid-macp1317>3.0.co;2-m

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Photopolymerization in the solid state is a powerful method to afford polymers with controlled topochemical structure 62. 63 Because it is easy to adsorb the monomers in a sonicated suspension where the crystals are all separate, the contact area is then a minor issue.…”

Section: Third Stage Of Organizationmentioning

confidence: 99%

Host–Guest Antenna Materials

et al. 2003

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The focus of this review is on host-guest composites with photonic antenna properties. The material generally consists of cylindrical zeolite L crystals the channels of which are filled with dye molecules. The synthesis is based on the fact that molecules can diffuse into individual channels. This means that, under the appropriate conditions, they can also leave the zeolite by the same way. In some cases, however, it is desirable to block their way out by adding a closure molecule. Functionalization of the closure molecules allows tuning of, for example, wettability, refractive index, and chemical reactivity. The supramolecular organization of the dyes inside the channels is a first stage of organization. It allows light harvesting within a certain volume of a dye-loaded nanocrystalline zeolite and radiationless transport to both ends of the cylinder or from the ends to the center. The second stage of organization is the coupling to an external acceptor or donor stopcock fluorophore at the ends of the channels, which can trap or inject electronic excitation energy. The third stage of organization is the coupling to an external device through a stopcock molecule. The wide-ranging tunability of these highly organized materials offers fascinating new possibilities for exploring excitation-energy-transfer phenomena, and challenges for developing new photonic devices.

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Section: Third Stage Of Organizationmentioning

confidence: 99%

Host–Guest Antenna Materials

et al. 2003

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“…Die Photopolymerisation in Feststoffen ist eine erfolgreiche Methode zur Herstellung von Polymeren mit einstellbarer topochemischer Struktur 62. 63 Da es einfach ist, Monomere in Suspensionen zu adsorbieren, sodass die Nanokristalle gut getrennt sind, ist die Kontaktfläche unkritisch.…”

Section: Dritte Organisationsstufeunclassified

Wirt‐Gast‐Antennenmaterialien

et al. 2003

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Wir stellen Wirt‐Gast‐Materialien vor, aufgebaut aus zylindrischen Zeolith‐L‐Kristallen, deren Kanäle mit Farbstoffmolekülen gefüllt sind. Die Synthese dieser Stoffe beruht auf der Eigenschaft der Moleküle, in einzelne Kanäle zu diffundieren. Der umgekehrte Prozess, das Herausdiffundieren der Farbstoffe, kann mithilfe eines molekularen “Korkens” unterdrückt werden. Durch Funktionalisierung dieser zapfenförmigen Moleküle lassen sich Eigenschaften wie Benetzbarkeit, Brechungsindex und chemische Reaktivität einstellen. Die supramolekulare Organisation der Farbstoffe innerhalb der Kanäle entspricht einer ersten Organisationsstufe. Damit gelingt es, Licht im Volumen eines Nanokristalls zu sammeln und Anregungsenergie strahlungslos an die Enden des Zylinders oder umgekehrt von dort zur Mitte zu transportieren. Eine zweite Organisationsstufe ist die Kupplung an einen externen Acceptor‐ oder Donor‐Zapfenfluorophor an den Kanalenden, der elektronische Anregungsenergie abfängt oder einspeist. Die dritte, zum Teil noch hypothetische Stufe umfasst die Kupplung an eine externe Funktionseinheit über Zapfenmoleküle. Die Abstimmbarkeit dieser hochorganisierten Materialien bietet attraktive Möglichkeiten zur Untersuchung von elektronischen Energieübertragungsphänomenen und zur Entwicklung von neuen photonischen Funktionseinheiten.

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“…The limit area per molecule, extrapolated to zero surface pressure by the linear isotherm portion, was 0.54 nm 2 /mol. We note that the blue form almost was not observed previously during photopolymerization of alcohol derivatives of diacetylene, and the red form of PDA was immediately formed, while isotherms of diin derivatives under study showed a comparatively rapid increase in the surface pressure in the formed Langmuir monolayer with decreasing area per molecule [28,29]. The latter situation could lead to rapid monolayer formation, which did not allow individual monomer molecules to occupy more advantageous positions for achieving well ordered film structures.…”

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confidence: 52%

Formation of a stable polymer blue phase under UV irradiation of Langmuir-Schaefer films of diin N-arylcarbamate derivative

Алексеев

Domnin

Ivanov

et al. 2014

Bull. Lebedev Phys. Inst.

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Polymerization under UV irradiation is studied in monolayer Langmuir-Schaefer films of diin N-arylcarbamate derivative. The formation of a stable polymer blue phase of diacetylene derivative stable against excess UV light and heating to a temperature of 120 • C was detected. The formation of the structurally ordered Langmuir monolayer of monomers is studied using Brewster angle microscopy.Keywords: Langmuir-Schaefer polymer films, blue phase.Diacetylene (DA) derivatives were objects of a large number of studies dealing with synthesis, structure, optical properties, and possible applications of these compounds [1][2][3][4][5][6][7][8][9]. In many cases, samples were prepared using Langmuir-Blodgett (LB) technique. Monomolecular diacetylene films prepared by this method have a number of advantages in comparison with bulk single-crystal samples of these materials [10]. For example, the thermal and mechanical stability of polymerized DA thin films in combination with specific characteristics of the film itself or characteristics introduced by other functional groups could be efficiently used in microelectronics, integrated optics, biological and chemical sensors, and in developing other molecular devices. It is known that the photochemical reaction of diins is a topochemical polymerization (TP) reaction, which means that the average area per molecule almost does not change during reaction [11]. It is also well known that the reaction does not occur until reactive groups appear at a certain distance and with certain orientation with respect to each other [5,12,13]. The polymerization process of the light-transparent DA film can be easily detected using visible spectroscopy, since the polydiacetylene (PDA) film shows extremely high optical density in the visible region of the spectrum [13][14][15]. The basic PDA forms are well known, which are referred to as the blue phase (absorption maximum at λ max ∼ 620 − 640 nm) and the red phase (Λ max ∼ 520 − 540 nm) [16]. Very often, due to external exposures (temperature, mechanical stresses, excess UV irradiation, and others), the blue phase transforms to the red phase [17][18][19][20]. PDA showing such color transitions can be a basis for developing various chemical sensors and biosensors [21][22][23][24][25]. Much less common are "blue" PDA films stable to excess UV irradiation or an elevated ambient temperature. The present work is devoted to exactly such films.The objective of this research is to study the TP of Langmuir-Schaefer (LS) films of diin Narylcarbamate with asymmetric structure O MeO − C 6 H 4 NHCO(CH 2 ) 5 (C ≡ C) 2 (CH 2 ) 2 OH.Synthesis of this compound was previously reported in [26,27]. Diin monomer solutions (c = 0.12 − 0.14 mmol) were prepared using analytical grade chloroform (Merck). A "KSV LB Mini trough"

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Solid state photopolymerization of modified amphiphilic diynes in multilayers

Cited by 8 publications

References 11 publications

Host–Guest Antenna Materials

Host–Guest Antenna Materials

Wirt‐Gast‐Antennenmaterialien

Formation of a stable polymer blue phase under UV irradiation of Langmuir-Schaefer films of diin N-arylcarbamate derivative

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