Structure of Ni(II) and Ru(III) Ammine Complexes Grafted onto Mesoporous Silicate Sieve

Brühwiler, Dominik; Frei, Heinz

doi:10.1021/jp0300795

Cited by 53 publications

(38 citation statements)

References 63 publications

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“…17 More specifically, the strong peaks at 3365, 3287 and 1619 cm -1 are very close to the asymmetric and symmetric stretch and bending modes of ammine ligands of Ni II centers grafted onto MCM-41. 18 Therefore, we assign the 3 bands to NH 3 tetrahedra absorb (790 cm -1 ), 23 furnish evidence for covalent anchoring of the Co centers on the silica pore surface.…”

Section: Single Co II Centers Anchored In Mcm-41mentioning

confidence: 89%

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Han

Frei

2007

Microporous and Mesoporous Materials

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Section: Single Co II Centers Anchored In Mcm-41mentioning

confidence: 89%

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Han

Frei

2007

Microporous and Mesoporous Materials

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“…[10] Fig. 1 shows the PSDs of mesoporous silica MCM-41 synthesized under hydrothermal conditions [11] in comparison to the corresponding materials prepared at room temperature.…”

Section: Mesoporous Silica and Zeolite Lmentioning

confidence: 99%

Functionalized Silicate Nanochannels: Towards Applications in Drug Delivery and Solar Energy Conversion

Brühwiler

Ritter

Ramm

et al. 2009

Chimia

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; Dolamic, I; Gartmann, N (2009Abstract: The defined pore networks of silicate-based molecular sieves are attractive for the development of highly organized inorganic/organic hybrid materials. Efficient energy transfer systems are obtained upon inclusion of dye molecules into the one-dimensional channels of zeolite L. The resulting host-guest materials form the basis for an advanced luminescent solar concentrator. The selective functionalization of the channel entrances with zinc phthalocyanine offers further possibilities in terms of employing the dye-zeolite composites for the sensitization of organic solar cells. Having larger pore sizes than zeolites as well as highly modifiable channel walls, mesoporous silicas have recently emerged as versatile starting materials for the synthesis of drug delivery devices. One of the most challenging aspects in this context is the control and the analysis of the functional group distribution. This topic is discussed on the basis of our recent work on the reaction of aminopropylalkoxysilanes with mesoporous silica MCM-41.

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“…Analogies with well-characterized molecular systems, in particular TMC/ silsesquioxane reaction products, suggest that coordination of one, two, or three silanol groups to the transition metal ion can be considered. [27] In a recent study, monopodal, dipodal, and tripodal grafting modes were indeed conclusively demonstrated by spectroscopic methods; [28] in previous studies, schemes involving grafting to two or three positions have been proposed rather frequently in the literature, but quite often they are merely ™educated guesses∫, with little conclusive evidence.…”

Section: Introductionmentioning

confidence: 95%

Amorphous Silica as a Versatile Supermolecular Ligand for Ni^II Amine Complexes: Toward Interfacial Molecular Recognition

2004

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Selective adsorption of Ni(II) amine complexes used as precursors for supported catalysts was studied on amorphous silica surfaces. The nature of the adsorption sites was probed by [Ni(en)(dien) (H2O)]2+, [Ni(en)2(H2O)2]2+, and [Ni(dien)(H2O)3]2+ (en = ethylenediamine, dien = diethylenetriamine), which respectively contain one, two, and three labile aqua ligands. The silica surface acts as a mono- or polydentate ligand that can substitute the aqua ligands of the Ni(II) complexes in an inner-sphere adsorption mechanism. Room-temperature adsorption isotherms indicate that each nickel complex selects a limited number of adsorption sites; different sites are recognised by the three complexes, even though they have the same charge and comparable sizes. Several spectroscopic techniques (UV/Vis/NIR, EXAFS, and 29Si NMR) were used to confirm the selective character of the interaction of Ni(II) amine complexes with the silica surface. The specific sites include both silanol/silanolate groups in the same number as the original labile ligands and other surface groups that probably act as hydrogen-bond acceptors. These two types of groups cooperate to result in interfacial molecular-recognition phenomena with interactional complementarity.

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Structure of Ni(II) and Ru(III) Ammine Complexes Grafted onto Mesoporous Silicate Sieve

Cited by 53 publications

References 63 publications

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Functionalized Silicate Nanochannels: Towards Applications in Drug Delivery and Solar Energy Conversion

Amorphous Silica as a Versatile Supermolecular Ligand for Ni^II Amine Complexes: Toward Interfacial Molecular Recognition

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Structure of Ni(II) and Ru(III) Ammine Complexes Grafted onto Mesoporous Silicate Sieve

Cited by 53 publications

References 63 publications

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Visible light absorption of binuclear TiOCoII charge-transfer unit assembled in mesoporous silica

Functionalized Silicate Nanochannels: Towards Applications in Drug Delivery and Solar Energy Conversion

Amorphous Silica as a Versatile Supermolecular Ligand for NiII Amine Complexes: Toward Interfacial Molecular Recognition

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Amorphous Silica as a Versatile Supermolecular Ligand for Ni^II Amine Complexes: Toward Interfacial Molecular Recognition