Monolayer behaviors and LB films of dihydroxo (phthalocyaninato) silicon and its polymer — one-dimensional phthalocyaninato-polysiloxanes

Chen, Peng-lei; Tang, Daihua; Wang, Xiaobing; Chen, Hui; Liu, Minghua; Li, Jun-bai; Liu, Xinhou

doi:10.1016/s0927-7757(00)00534-3

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…As shown in Figure , Pc 1 could form a stable floating Langmuir monolayer at the air/water interface, which was collapsed at 62.5 mN/m. The molecular area of 1.25 nm 2 deduced from the isotherm indicated the formation of monolayers on the subphase surface …”

Section: Resultsmentioning

confidence: 99%

“…The molecular area of 1.25 nm 2 deduced from the isotherm indicated the formation of monolayers on the subphase surface. 16 Multilayer LS films of Pc 1 on solid supports deposited at selected surface pressures can be achieved by a horizontal transferring method. UV-vis spectra a, b, and c in Figure 2 give the absorbance spectra of Pc 1 in chloroform solution, in a 40-layer LS film deposited at 20 mN/m before and after polymerization reaction, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Materials and Producers. Silicon 2,3,9,10,16,17,23,24octakis(octyloxy)-29H,31H-phthalocyanine dihydroxide (Pc 1) was purchased from Aldrich. The apparatus employed for measuring surface pressure-area (π-A) isotherms and depositing multilayer LS films is a computer-controlled KSV-1100 film balance (KSV instruments, Helsinki, Finland).…”

Section: Methodsmentioning

confidence: 99%

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Optically Active Phthalocyaninato−Polysiloxane Constructed from Achiral Monomers: From Noncovalent Assembly to Covalent Polymer

Chen

Liu

2007

Macromolecules

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In this paper, we reported that optically active supramolecular assemblies of an achiral phthalocyanine derivative, silicon 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine dihydroxide (Pc 1), could be easily achieved through the Langmuir and Langmuir−Schaefer (LS) technique. We have found that the LS film of Pc 1 showed weak Cotton effect (CE) when it was subjected to the circular dichroism (CD) measurements. The chirality of the LS film was suggested to be due to the spontaneous symmetry breaking occurred at the air/water interface. More interestingly, such assemblies connected through the noncovalent bond could be further converted into covalent bond under heating at 180 °C in a high vacuum for 10 h. UV−vis spectra and FT-IR have confirmed the polymerization of Pc 1 in the LS film during the heating, which resulted in the formation of the corresponding phthalocyaninato−polysiloxane (PcPs 2) polymer. Stronger Cotton effect was detected for the thin solid film of PcPs 2 compared with that of the Pc 1 LS film, suggesting that more efficient exciton coupling existed between the covalently linked phthalocyanine chromophore in the polymer PcPs 2. The investigation provided an easy way of constructing optically active polymeric PcPs films exclusively from achiral monomer unit by the preassembly of monomer through interfacial organization.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…

…”

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confidence: 99%

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Optically Active Phthalocyaninato−Polysiloxane Constructed from Achiral Monomers: From Noncovalent Assembly to Covalent Polymer

Chen

Liu

2007

Macromolecules

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“…The blue shifts and broadening of the bands for phthalocyanine compounds in thin films is due to aggregation. [35][36][37] One can notice also that the absorption of the Pc layer is lower than that of the Pc-C 60 layer at the Q-band, while the opposite could be expected based on the differences of the mean molecular areas of the films. This probably can be explained by two factors.…”

Section: Resultsmentioning

confidence: 99%

Photodynamics of Charge Separation and Recombination in Solid Alternating Films of Phthalocyanine or Phthalocyanine−Fullerene Dyad and Perylene Dicarboximide

et al. 2009

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Alternate bilayer structures of N,N′-bis(2,5-di-tert-butylphenyl)-3,4,9,10-perylene dicarboximide (PDI), free-base phthalocyanines (Pc), and double-linked free-base phthalocyanine−fullerene dyad (Pc−C60) were prepared by the Langmuir−Schäfer method and studied using a range of optical spectroscopy methods including femtosecond pump−probe and up-conversion. An efficient quenching of the PDI fluorescence by Pc and Pc−C60 dyad was observed in both steady-state and time-resolved fluorescence measurements. The quenching takes place in less than a few picoseconds, and is due to energy transfer from perylene dicarboximide to phthalocyanine chromophore in PDI|Pc and PDI|Pc−C60 films. In the PDI|Pc−C60 bilayer structure the energy transfer is followed by a charge separation in the Pc−C60 layer, yielding a long-lived (a few microseconds) intermolecular charge separated state similar to that reported recently for Pc−C60 Langmuir−Blodgett films (Lehtivuori, H.; et al. J. Phys. Chem. C 2008, 112, 9896−9902).

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Phthalocyanine Thin Films: Deposition and Structural Studies

Cook

Chambrier

2003

The Porphyrin Handbook

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Monolayer behaviors and LB films of dihydroxo (phthalocyaninato) silicon and its polymer — one-dimensional phthalocyaninato-polysiloxanes

Cited by 6 publications

References 24 publications

Optically Active Phthalocyaninato−Polysiloxane Constructed from Achiral Monomers: From Noncovalent Assembly to Covalent Polymer

Optically Active Phthalocyaninato−Polysiloxane Constructed from Achiral Monomers: From Noncovalent Assembly to Covalent Polymer

Photodynamics of Charge Separation and Recombination in Solid Alternating Films of Phthalocyanine or Phthalocyanine−Fullerene Dyad and Perylene Dicarboximide

Phthalocyanine Thin Films: Deposition and Structural Studies

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