Synthesis of Mesoporous Silicates with Controllable Pore Size Using Surfactant Ruthenium(II) Complexes as Templates

Yam, Vivian Wing‐Wah; Li, Bin; Zhu, Nianyong

doi:10.1002/1521-4095(20020517)14:10<719::aid-adma719>3.0.co;2-5

Cited by 25 publications

(11 citation statements)

References 4 publications

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“…We previously demonstrated a method to prepare the surfactant ruthenium(II) complexes that is used to synthesize mesostructured materials with a regular, hexagonal array of variable-pore-size uniform channels. [57] In this study, the oxygen sensor was prepared as mesostructured using the CTAB surfactant template. [48][49][50][51] Figure 3 shows the small-angle X-ray diffraction (SAXRD) patterns of the surfactant-extracted mesostructured thin film and bulk sample.…”

Section: Resultsmentioning

confidence: 71%

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor

Lei

Zhang

et al. 2006

Adv Funct Materials

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198

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Novel oxygen sensors consisting of a [Ru(bpy)2phen]2+ (bpy: 2,2′‐bipyridyl, phen: phenathroline) portion covalently grafted to a mesostructured silica‐based network are prepared in situ via a sol–gel approach with the help of cetyltrimethylammoniumbromide (CTAB) surfactant. 1,10‐Phenanthroline covalently grafted to 3‐(triethoxysilyl)propyl isocyanate is used as not only the sol–gel precursor but also as the second ligand of the Ru(bpy)2Cl2 · 2H2O complex to prepare the sol–gel‐derived mesostructured silicates for an oxygen sensor. For comparison purposes, the oxygen sensors in which [Ru(bpy)2phen]Cl2 is conventionally physically incorporated into the matrix are also prepared. Elemental analysis, NMR, Fourier transform IR, UV‐vis electronic absorption, luminescence‐intensity quenching Stern–Volmer plots, and excited‐state decay analysis are used to characterize the obtained oxygen sensors. These obtained bulk xerogels and spin‐coated thin films show that the homogeneity and the sensitivity of the covalently grafted samples are superior to those of the physically incorporated ones, and the highest sensitivity is obtained in the mesostructured bulk xerogel. This improvement in oxygen sensitivity is attributed to the increased diffusivity of oxygen in the uniform and nearly parallel porous structure of the Mobil Catalytic Material 41 mesostructured matrix, the enhanced homogeneity results from the covalently grafted propyl group in –Si–(CH2)3– that acts as the fundamental spacer which prevents interaction between the attached RuII complex and the silica matrix, and optimal dispersion in the mesopores during the sol–gel polycondensation. Furthermore, the greatly minimized leaching effect of the sensing molecules could be observed in the covalently grafted system. The covalent grafting strategy presented in this paper provides superior optical oxygen sensors with homogeneous distribution, improved sensitivity, and simplified calibration plots.

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Section: Resultsmentioning

confidence: 71%

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor

Lei

Zhang

et al. 2006

Adv Funct Materials

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198

199

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“…Metallomesogens have been studied for decades and encompass multiple types of chemical species which include lanthanides, metallocenes, macrocyclic metallomesogens, ionics, and polymers . Metallomesogens have been investigated extensively for applications which include electron paramagnetic resonance (for paramagnetic metallomesogens) and ordered templates for mesoporous materials …”

Section: Metallomesogensmentioning

confidence: 99%

Supramolecular Assembly of Single-Source Metal–Chalcogenide Nanocrystal Precursors

2018

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In this feature article, we discuss our recent work in the synthesis of novel supramolecular precursors for semiconductor nanocrystals. Metal chalcogenolates that adopt liquid-crystalline phases are employed as single-source precursors that template the growth of shaped solid-state nanocrystals. Supramolecular assembly is programmed by both precursor chemical composition and molecular parameters such as the alkyl chain length, steric bulk, and the intercalation of halide ions. Here, we explore the various design principles that enable the rational synthesis of these single-source precursors, their liquid-crystalline phases, and the various semiconductor nanocrystal products that can be generated by thermolysis, ranging from highly anisotropic two-dimensional nanosheets and nanodisks to spheres.

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“…Complexes bearing the [Ru(bpy) 3 ] 2+ (where bpy ¼ 2,2 0 -bipyridine) unit as building block are of wide interest, [1][2][3][4] and their upgrading to surface-active molecules can improve their employment in applications such as probes in emulsions, 5,6 optoelectronics, 7 monolayers 8,9 and templates of mesoporous materials. [10][11][12] In fact, ruthenium-containing surfactants have already been the central subject of many studies in different areas. [13][14][15][16][17][18] In particular, detailed studies of metallosurfactants containing [Ru(bpy) 3 ] 2+ as the headgroup have been performed by Bruce and co-workers.…”

Section: Introductionmentioning

confidence: 99%

Inverted aggregates of luminescent ruthenium metallosurfactants

et al. 2008

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Metallosurfactants and their resulting aggregates combine unique spectroscopic and reactivity properties due to space confinement. We have found the requirements to obtain the first inverted micelles with luminescent metallosurfactants. The compounds possess several long linear chains that favour the solubility of the highly water-soluble metal polar head in non-polar phases. The size and shape of the aggregates have been determined using dynamic light scattering. Atomic force microscopy allowed us to study the dry structure of the aggregates on surfaces. Additionally, the self-assembly of the metal complexes in solution have been monitored by steady state and time-resolved absorption and emission spectroscopy.

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Synthesis of Mesoporous Silicates with Controllable Pore Size Using Surfactant Ruthenium(II) Complexes as Templates

Cited by 25 publications

References 4 publications

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor

Supramolecular Assembly of Single-Source Metal–Chalcogenide Nanocrystal Precursors

Inverted aggregates of luminescent ruthenium metallosurfactants

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Synthesis of Mesoporous Silicates with Controllable Pore Size Using Surfactant Ruthenium(II) Complexes as Templates

Cited by 25 publications

References 4 publications

Mesostructured Silica Chemically Doped with RuII as a Superior Optical Oxygen Sensor

Mesostructured Silica Chemically Doped with RuII as a Superior Optical Oxygen Sensor

Supramolecular Assembly of Single-Source Metal–Chalcogenide Nanocrystal Precursors

Inverted aggregates of luminescent ruthenium metallosurfactants

Contact Info

Product

Resources

About

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor

Mesostructured Silica Chemically Doped with Ru^II as a Superior Optical Oxygen Sensor