Photophysics of mixed-ligand polypyridyl ruthenium(II) complexesimmobilised in silica sol–gel monoliths

Mongey, K.F.; Vos, Johannes G.; MacCraith, Brian D.; McDonagh, Colette; Coates, Colin G.; McGarvey, John J.

doi:10.1039/a701385j

Cited by 51 publications

(36 citation statements)

References 31 publications

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“…An important point that needs to be pointed out in our system is that careful optimization of the processing conditions is necessary to obtain the mesostructured samples with high quality. This following particular procedure was chosen because it was representative of TEOS-based xerogels reported in the literature [18,[22][23][24]33,36,38,[49][50][51]. A pre-hydrolyzed solution contains TEOS, ethanol, deionized water, and HCl (1:3:5 × 10 -5 :1, molar ratio) was first prepared by refluxing at 90°C for 1 h to form the stock solution [50].…”

Section: Methodsmentioning

confidence: 99%

“…They can also be made into usable forms such as thin films and bulk pieces. [22][23][24][28][29][30][31][32][33][35][36][37][38][39] In general, a sol-gel process begins with the formation of a colloidal suspension of the reaction products called a sol, usually from metal alkoxide monomers through hydrolysis and polycondensation reactions at room temperature. The sol undergoes a transition to a soft porous wet gel, which eventually becomes a solid porous aggregate of extremely small particles known as a xerogel.…”

Section: Introductionmentioning

confidence: 99%

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

Lei

Zhang

et al. 2006

Adv Funct Materials

199

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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: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Lei

Zhang

et al. 2006

Adv Funct Materials

199

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“…[30] The extremely long lifetimes of the tris-(4,7-diphenylphenanthroline)ruthenium(II) complex of up to 9640 ns which is extensively used in oxygen sensing is, however, worth noting. [31] In this contribution we present a series of tetraaryl-substituted 1,10-phenanthroline ligands, which were prepared by Suzuki reactions, and their corresponding rutheniumpolypyridyl complexes (see Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Tetrasubstituted 1,10‐Phenanthrolines and Their Ruthenium Complexes

et al. 2007

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The synthesis and the photophysical properties of a series of tetrasubstituted phenanthroline (phen) ruthenium complexes of the type [Ru(tbbpy) 2 (phen-R 4 )] 2+ (tbbpy = 4,4Ј-di-tert-butyl-2,2Ј-bipyridine; phen = 1,10-phenanthroline; R represents the substitution at 3-, 5-, 6-and 8-positions with phenyl, 4-tert-butylphenyl and para-biphenyl) and of a homoleptic [Ru(phen-RЈ 4 ) 3 ] 2+ (RЈ = 4-tert-butylphenyl) are described. The phen-R 4 ligands were obtained in high yields using Suzuki-type coupling reactions. The solid-state structure of

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“…An inherent problem found in the temperature sensors is the cross sensitivity with oxygen depending on the nature of the transition involved in the emission of the optical probe ,. A strategy usually employed for these type of optical sensors constitutes in a calibration curve correction and/or incorporation of an oxygen chemosensor .…”

Section: Introductionmentioning

confidence: 99%

Optical Temperature Sensors Based On Europium(III) Beta‐Diketonate Complexes Chemically Bonded To Functionalized Polydimethylsiloxane

et al. 2018

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New luminescent temperature probes were synthesized based on the dispersion of the europium(III) [Eu(tta)3(H2O)2] complex (tta=thenoyltrifluoroacetonate), and the covalent bond of europium(III) [Eu(tta)3(adppo)(H2O)] and [Eu(tta)3(adppo)2] (adppo=allyldiphenylphosphine oxide) complexes by the hydroslylilation reaction between the allyl group and the hydride terminal polydimethylsiloxane (PDMS). Phosphine oxide coordination to the europium(III) ion increases the lifetime values and changes the emission profile to a more symmetrical europium(III) chemical environment. The membranes shows a decrease in lifetime values with the increase of temperature, and the dynamic range of the luminescent membranes shifts to higher temperatures by successive substitution of water molecules for the phosphine oxide ligand. Sensitivities of 6.76, 7.80 and 8.35 μS C−1 were obtained for the membranes containing the [Eu(tta)3(H2O)2], [Eu(tta)3(adppo)(H2O)] and [Eu(tta)3(adppo)2] complexes, respectively. Low oxygen cross sensitivity are observable in the membranes containing the coordinated adppo molecule, allowing their use in multiparametric sensors.

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Photophysics of mixed-ligand polypyridyl ruthenium(II) complexesimmobilised in silica sol–gel monoliths

Cited by 51 publications

References 31 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

Synthesis and Properties of Tetrasubstituted 1,10‐Phenanthrolines and Their Ruthenium Complexes

Optical Temperature Sensors Based On Europium(III) Beta‐Diketonate Complexes Chemically Bonded To Functionalized Polydimethylsiloxane

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Photophysics of mixed-ligand polypyridyl ruthenium(II) complexesimmobilised in silica sol–gel monoliths

Cited by 51 publications

References 31 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

Synthesis and Properties of Tetrasubstituted 1,10‐Phenanthrolines and Their Ruthenium Complexes

Optical Temperature Sensors Based On Europium(III) Beta‐Diketonate Complexes Chemically Bonded To Functionalized Polydimethylsiloxane

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Resources

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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