Preparation, characterization and evaluation of a series of heterogeneous platinum catalysts immobilized on magnetic silica with different acid ligands

Li, Laiming; Li, Youxin; Assefa, Aschenaki; Bao, Jie

doi:10.1007/s11243-019-00348-w

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…Above the melting temperature, the polymer would melt, releasing catalyst and triggering hydrosilylation (Figure 2). While immobilizing Pt‐based hydrosilylation catalysts onto inorganic supports has been implemented to facilitate catalyst recovery, the immobilization has not been explored as a means for achieving spatial and temporal control of the curing reaction [31–40] …”

Section: Introductionmentioning

confidence: 99%

“…While immobilizing Pt-based hydrosilylation catalysts onto inorganic supports has been implemented to facilitate catalyst recovery, the immobilization has not been explored as a means for achieving spatial and temporal control of the curing reaction. [31][32][33][34][35][36][37][38][39][40] Towards this purpose, we chose a weakly-coordinating norbornene ligand to tether the catalyst to a silica nanoparticle surface. [14] Contrary to our initial assumption of a weak inhibitory effect from the ligand based on the weak ligand binding strength, however, we observed a latency effect with the functionalized particles prior to encapsulation.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Guironnet

Miller

2022

Angewandte Chemie

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Functionalizing inorganic particles with organic ligands is a common technique for heterogenizing organometallic catalysts. We describe how coordinating molecular platinum to silica nanoparticles functionalized with a high density of norbornene ligands causes unexpected latency of the catalytic activity in hydrosilylation reactions when compared to an identical reaction in which the norbornene is not tethered (2 % vs 97 % conversion in 1 h). Performing the hydrosilylation at elevated temperature (70 °C) suppresses this activity delay, suggesting the usefulness of this technique towards temperature‐triggered catalysis. We demonstrate that this latency is related to ligand density on the particle surface, chemical structure of the norbornene, and silica nanoparticle topology. We also establish the benefit of this latency for triggered curing of silicone elastomers. Overall, our work establishes the non‐innocent role of inorganic supports when functionalized with organometallic complexes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Guironnet

Miller

2022

Angewandte Chemie

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“…While immobilizing Pt‐based hydrosilylation catalysts onto inorganic supports has been implemented to facilitate catalyst recovery, the immobilization has not been explored as a means for achieving spatial and temporal control of the curing reaction. [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]…”

Section: Introductionmentioning

confidence: 99%

Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Guironnet

Miller

2022

Angew Chem Int Ed

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Functionalizing inorganic particles with organic ligands is a common technique for heterogenizing organometallic catalysts. We describe how coordinating molecular platinum to silica nanoparticles functionalized with a high density of norbornene ligands causes unexpected latency of the catalytic activity in hydrosilylation reactions when compared to an identical reaction in which the norbornene is not tethered (2 % vs 97 % conversion in 1 h). Performing the hydrosilylation at elevated temperature (70 °C) suppresses this activity delay, suggesting the usefulness of this technique towards temperature-triggered catalysis. We demonstrate that this latency is related to ligand density on the particle surface, chemical structure of the norbornene, and silica nanoparticle topology. We also establish the benefit of this latency for triggered curing of silicone elastomers. Overall, our work establishes the noninnocent role of inorganic supports when functionalized with organometallic complexes.

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Recent Advances of Group 10 Transition Metal Hydrosilylation Catalysts

Shimada

2023

Topics in Organometallic Chemistry

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Preparation, characterization and evaluation of a series of heterogeneous platinum catalysts immobilized on magnetic silica with different acid ligands

Cited by 4 publications

References 44 publications

Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Tunable Latency of Hydrosilylation Catalyst by Ligand Density on Nanoparticle Supports

Recent Advances of Group 10 Transition Metal Hydrosilylation Catalysts

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