Photoinduced electron transfer in nanostructures of ultrathin polyimide films containing porphyrin moieties

Ohkita, Hideo; Ogi, Takeo; Kinoshita, Ryoji; Ito, Shinzaburo; Yamamoto, Masahide

doi:10.1016/s0032-3861(02)00160-x

Cited by 26 publications

(27 citation statements)

References 29 publications

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“…The lattice constant of FAU-type zeolite (2.4 nm), is close to the critical distance of electron transfer generally accepted (1-2 nm). 24,25 In the model of the cubic FAU-type zeolite, there are 74088 unit cells in total, and 10088 unit cells of these are classified as the outermost unit cells, corresponding to 14% of the total unit cells. Assuming that FL molecules are uniformly located in each zeolite particle, 14% of the FL molecules are located in the cages in the outermost unit cells.…”

Section: Discussionmentioning

confidence: 99%

“…Second, a quencher should not invade into a host. It is worthy to note that the critical distance for electron transfer between a donor (a luminescent molecule) and an acceptor (a quencher) is several nanometers, 24,25 whereas that for energy transfer is about 10 nm for Förster relaxation 26 and 1 nm for Dexter relaxation. 27 In any case, the critical distances on the order of nanometers are considered to be proper for realizing the idea proposed here.…”

Section: Theoreticalmentioning

confidence: 99%

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Evidence for Encaging Luminescent Guest Molecules in the Inner Cages of Zeolite Host

Kataoka¹,

Mozer²,

Tsukahara³

et al. 2007

Bulletin of the Chemical Society of Japan

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Clear evidence for encaging guest molecules in a host material was obtained for FAU-type zeolite containing fluorescein (FL) as a guest by employing the luminescence-quenching phenomenon of FL with C 60 . Whereas fluorescence of FL molecules adsorbed on the outer surface of the zeolite was effectively quenched as well as that in a homogeneous solution, that of the most FL molecules in the cages of the zeolite did not suffer from quenching by C 60 , giving clear evidence that FL molecules are located in the inner cages, which are inaccessible to C 60 . Only the fluorescence of the FL molecules located in the cages in the outermost unit cells of the zeolite was partially quenched. This partial quenching can be understood by considering the structure of the zeolite and the critical distance of electron transfer inducing the fluorescence quenching.Nanohybrid materials using host-guest systems are currently attractive for scientists working in chemistry and biology, because of their special properties and functions that cannot be obtained from independent constituents. To make use of these functions, optical functional materials based on nanohybrid systems have widely been studied, and a large number of papers on nanohybrid systems have been published. [1][2][3][4][5][6][7][8] Recently, our research group has reported that rare earth metal ions and a photosensitizer encaged in zeolite cages show rainbow-color photoluminescence. 9 The change in the color of the photoluminescence induced by changing the temperatures and the excitation wavelength is a good example of the special functions that cannot be obtained from independent constituents. Distinction between guests encaged in hosts and those adsorbed on the surface of hosts is essential for systematizing nanohybrid chemistry. In order to systematize nanohybrid chemistry using host-guest systems, it is required to elucidate the origin of the specific properties of nanohybrid systems, which usually appear only when the guests are encaged into the hosts. NMR, [10][11][12][13]12,14,15 SEM,16,17 optical microscopy,18 and TEM 1,16,17,19 are used as the conventional methods for the distinction. NMR and IR are important tools that give information of local structures or environments of guests and hosts in the range from atomic size to molecular size. In studies on nanohybrid systems using organic host materials (e.g., cyclodextrin 20 or crown ether 21 ), NMR and IR measurements provide us clear information on the position of guest molecules, because these organic hosts have small and simple structures compared to inorganic host materials (e.g., zeolite 9-15 or mesoporous silica 2,16

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Section: Discussionmentioning

confidence: 99%

Section: Theoreticalmentioning

confidence: 99%

Evidence for Encaging Luminescent Guest Molecules in the Inner Cages of Zeolite Host

Kataoka¹,

Mozer²,

Tsukahara³

et al. 2007

Bulletin of the Chemical Society of Japan

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“…Various phthalocyanine polymers, for example, stacked polyphthalocyanines for electroconductors [7,8], copolymerized phthalocyanine polymers for photoconductors [9,10], phthalocyanine polymers for catalyzers [11,12], and so on, have already been prepared. These polymers have high T g and are soluble in common organic solvent.…”

Section: Introductionmentioning

confidence: 99%

Preparation and nonlinear optical characterization of a novel hyperbranched poly(aryl ether ketone) end-functionalized with nickel phthalocyanine

Wang

Zhang

et al. 2008

Dyes and Pigments

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“…So far, many attempts have been made to realize the artificial highly efficient photoenergy conversion systems by using molecular arrays [3][4][5][6][7][8][9][10], dendrimer [11,12], self-assembled monolayers (SAM) [13,14], and LB films [15][16][17][18][19][20][21][22][23][24][25]. Among these systems, the LB film is a promising candidate because of its well-defined nanostructure and wide choice of suitable chemicals from a huge number of organic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Porphyrins, which play an important role in the photosynthesis of plants, are preferable photosensitizers for utilizing solar energy because of the large absorption bands in the ultraviolet-visible region [26]. So far, many studies have been done on LB films of porphyrins [24,[27][28][29][30][31][32][33][34]. However, aggregation of porphyrins in LB films causes crucial Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and optical characterization of porphyrin chromophores incorporated into ultrathin polyimide films

Ogi

Kinoshita

Ito

2005

Journal of Colloid and Interface Science

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Photoinduced electron transfer in nanostructures of ultrathin polyimide films containing porphyrin moieties

Cited by 26 publications

References 29 publications

Evidence for Encaging Luminescent Guest Molecules in the Inner Cages of Zeolite Host

Evidence for Encaging Luminescent Guest Molecules in the Inner Cages of Zeolite Host

Preparation and nonlinear optical characterization of a novel hyperbranched poly(aryl ether ketone) end-functionalized with nickel phthalocyanine

Spectroscopic and optical characterization of porphyrin chromophores incorporated into ultrathin polyimide films

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