Squarely Mesoporous and Functional Nanocomposites by Self‐Directed Assembly of Organosilane

Peng, Huisheng; Lu, Yunfeng

doi:10.1002/adma.200701927

Cited by 28 publications

(23 citation statements)

References 27 publications

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“…The effect also occurs with species smaller than the protein used by the abovementioned authors, and depends on other subtle factors such as the position and identity of the substituents in the structure of porphyrins, and the identity of the cation in the respective complexes. Recently, Peng and Lu found [ 449 ] structures such as the H 2 P-F precursors, herein described ( Figure 14 ) that make possible the synthesis of mesoporous and functional nanocomposites without the use of surfactants. As occurs in our systems, the presence of tetrapyrrolic species, such as porphyrins (even if related species could also be used), induce the directional assemblage of the network structure.…”

Section: Tetrapyrrole Macrocycles and Cavity Pore Engineering Thromentioning

confidence: 99%

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

et al. 2013

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The crossed and linked histories of tetrapyrrolic macrocycles, interwoven with new research discoveries, suggest that Nature has found in these structures a way to ensure the continuity of life. For diverse applications porphyrins or phthalocyanines must be trapped inside solid networks, but due to their nature, these compounds cannot be introduced by thermal diffusion; the sol-gel method makes possible this insertion through a soft chemical process. The methodologies for trapping or bonding macrocycles inside pristine or organo-modified silica or inside ZrO2 xerogels were developed by using phthalocyanines and porphyrins as molecular probes. The sizes of the pores formed depend on the structure, the cation nature, and the identities and positions of peripheral substituents of the macrocycle. The interactions of the macrocyclic molecule and surface Si-OH groups inhibit the efficient displaying of the macrocycle properties and to avoid this undesirable event, strategies such as situating the macrocycle far from the pore walls or to exchange the Si-OH species by alkyl or aryl groups have been proposed. Spectroscopic properties are better preserved when long unions are established between the macrocycle and the pore walls, or when oligomeric macrocyclic species are trapped inside each pore. When macrocycles are trapped inside organo-modified silica, their properties result similar to those displayed in solution and their intensities depend on the length of the alkyl chain attached to the matrix. These results support the prospect of tuning up the pore size, surface area, and polarity inside the pore cavities in order to prepare efficient catalytic, optical, sensoring, and medical systems. The most important feature is that research would confirm again that tetrapyrrolic macrocycles can help in the development of the authentic pore engineering in materials science.

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Section: Tetrapyrrole Macrocycles and Cavity Pore Engineering Thromentioning

confidence: 99%

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

et al. 2013

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“…We have synthesized porphyrin-bridged silsesquioxane (PBS) with the chemical structure shown in Table 1 and further schematically illustrated in Figure 8 [43]. Unexpectedly, PBS molecules form thin films with highly ordered mesoporous structure after evaporation of acidic solution in THF (Figure 9(a)).…”

Section: Self-assembly Of Porphyrins-bridged Silsesquioxanementioning

confidence: 99%

“…Table 1 structures of some bridged silsesquioxanes [5,[10][11][12][13][14][15][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. However, the embedded organic components are mainly limited to passive functional groups, such as methylene, ethane, ethylene, dodecane, and benzene.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of bridged silsesquioxanes incorporated with conjugated organic functionalities

Cai

Sun

et al. 2010

Front. Chem. China

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Self-assembly of bridged silsesquioxanes with a chemical structure of (RO) 3 Si-R′-Si (OR) 3 represents an efficient approach to design and to fabricate functional organic/ inorganic nanocomposites. The desired functionalities are mainly incorporated into the R' with R of a hydrolysable alkoxide group such as CH 3 or CH 3 CH 2 . This feature article discusses two typical assembly approaches: self-directed assembly aiming at ordered solid materials and surfactant-directed assembly aiming at periodic mesoporous organosilica, with emphasis on the bridged silsesquioxanes in which conjugated functional organic groups are incorporated. The conjugated moieties are shown to be critical to the resulting assembly structure, morphology, and property. Self-assembly of three bridged silsesquioxanes based on polydiacetylene, perylene, and porphyrin has been detailed, respectively.

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“…[25][26][27][28] Generally, it is difficult to achieve significant electrical conduction in organosilica materials because of the insulating properties of the silica moieties and the disorder in the organic moieties. Lu and co-workers 31,32 reported the synthesis of organosilica microtubes and flakes with a lamellar orientation of the organic groups from bridged organosilane precursors containing p-conjugated PBI and porphyrin, respectively. Lu and co-workers 31,32 reported the synthesis of organosilica microtubes and flakes with a lamellar orientation of the organic groups from bridged organosilane precursors containing p-conjugated PBI and porphyrin, respectively.…”

Section: Introductionmentioning

confidence: 99%

Highly conductive and stable polysiloxane-modified perylenebisimide nanosheets and nanowires by self-assembly and subsequent condensation

Zhang

Ren

Sun

et al. 2015

Phys. Chem. Chem. Phys.

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Perylenebisimide (PBI) nanowires and nanosheets with high chemical and mechanical stability are prepared by a simple way. Firstly, a PBI-based organosilane precursor PBI-Si(OEt)3 was synthesized. Its nanostructures were then assembled by a solvent-exchange method. The nanostructures could be adjusted by assembling in different solvents. The obtained nanostructures were finally fixed by acetic acid vapor treatment through polycondensation of the triethoxysilyl groups in the precursors. After polycondensation, the nanostructures hardly change and they become insoluble in common solvents. Moreover, the conductivity of the polycondensed nanowires and nanosheets are ca. 35-40 times than that of polycondensed spin-coated PBI-Si(OEt)3 film by current sensing atomic force microscopy (CSAFM).

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Squarely Mesoporous and Functional Nanocomposites by Self‐Directed Assembly of Organosilane

Cited by 28 publications

References 27 publications

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

Crossed and Linked Histories of Tetrapyrrolic Macrocycles and Their Use for Engineering Pores within Sol-Gel Matrices

Self-assembly of bridged silsesquioxanes incorporated with conjugated organic functionalities

Highly conductive and stable polysiloxane-modified perylenebisimide nanosheets and nanowires by self-assembly and subsequent condensation

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