EPR study of platinum supported on NaY

Schmauke, Thorsten; Möller, Einar; Roduner, Emil

doi:10.1039/a805409f

Cited by 16 publications

(18 citation statements)

References 13 publications

(17 reference statements)

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“…Theroom temperature solid-state EPR spectrum of K(THF) 4 [1]d isplays axial symmetry,w ith g ? [33][34][35] However,they are very much in accord with spectra exhibited by systems containing closed-shell platinum centers bound to radical ligands. The small degree of g anisotropy and the minimal deviation of these values from 2.002 (g of afree electron) differ from EPR spectra typically seen for Pt-based S = 1/2 metalloradicals.…”

Section: Angewandte Chemiementioning

confidence: 52%

“…The small degree of g anisotropy and the minimal deviation of these values from 2.002 (g of afree electron) differ from EPR spectra typically seen for Pt-based S = 1/2 metalloradicals. [33][34][35] However,they are very much in accord with spectra exhibited by systems containing closed-shell platinum centers bound to radical ligands. [36,37] Noticeably,n oc oupling to the 195 Pt nucleus (I = 1/2, 33.8 %abundant) is resolved, suggesting that minimal spin density resides at the Pt 3 core.…”

Section: Angewandte Chemiementioning

confidence: 52%

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Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

2016

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Owing to their unique topologies and abilities to selfassemble into av ariety of extended and aggregated structures, the binary platinum carbonyl clusters [Pt 3 (CO) 6 ] n 2À ("Chini clusters") continue to draw significant interest. Herein, we report the isolation and structural characterization of the trinuclear electron-transfer series [Pt 3 (m-CO) 3 (CNAr Dipp2 ) 3 ] nÀ (n = 0, 1, 2), which represents au nique set of monomeric Pt 3 clusters supported by p-acidic ligands.S pectroscopic,c omputational, and synthetic investigations demonstrate that the highest-occupied molecular orbitals of the mono-and dianionic clusters consist of acombined p*-framework of the CO and CNAr Dipp2 ligands,w ith negligible Pt character.A ccordingly,t his study provides precedent for an ensemble of carbonyl and isocyanide ligands to function in ar edox noninnocent manner.

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Section: Angewandte Chemiementioning

confidence: 52%

Section: Angewandte Chemiementioning

confidence: 52%

Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

2016

View full text Add to dashboard Cite

show abstract

“…The small degree of g anisotropy and the minimal deviation of these values from 2.002 (g of a free electron) differ from EPR spectra typically seen for Pt-based S = 1/2 metalloradicals. [33][34][35] However, they are very much in accord with spectra exhibited by systems containing closed-shell platinum centers bound to radical ligands. [36,37] Noticeably, no coupling to the 195 Pt nucleus (I = 1/2, 33.8% abundant) is resolved, suggesting that minimal spin density resides at the Pt 3 core.…”

mentioning

confidence: 52%

Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

2016

View full text Add to dashboard Cite

Owing to their unique topologies and abilities to self-assemble into a variety of extended and aggregated structures, the binary platinum carbonyl clusters [Pt3 (CO)6 ]n (2-) ("Chini clusters") continue to draw significant interest. Herein, we report the isolation and structural characterization of the trinuclear electron-transfer series [Pt3 (μ-CO)3 (CNAr(Dipp2) )3 ](n-) (n=0, 1, 2), which represents a unique set of monomeric Pt3 clusters supported by π-acidic ligands. Spectroscopic, computational, and synthetic investigations demonstrate that the highest-occupied molecular orbitals of the mono- and dianionic clusters consist of a combined π*-framework of the CO and CNAr(Dipp2) ligands, with negligible Pt character. Accordingly, this study provides precedent for an ensemble of carbonyl and isocyanide ligands to function in a redox non-innocent manner.

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“…Roduner's group has studied with continuous-wave and pulsed EPR methods platinum clusters immobilized on L-and faujasite-type zeolites [68,69]. EPR is a non-invasive technique that yields information on supported paramagnetic metal clusters.…”

Section: Reactions or Related Phenomena ''Electron-rich'' Metal Nanopmentioning

confidence: 99%

Metal–Support Interactions

Ruppert

Weckhuysen

2008

Handbook of Heterogeneous Catalysis

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Supported metal catalysts are comprised of small metal nanoparticles dispersed on the surface of a support material. Previously, the role of the support oxide was commonly thought to be limited to provide large metal surface areas. However, it is now generally accepted that the activity and selectivity of these catalysts are dependent on the type and composition of the support used [1][2][3] or even on thermal pretreatment conditions of catalysts consisting of the same metal and support [4]. In other words, the role of the support goes well beyond strictly physical phenomena such as increasing the surface area, and the specific interaction of the support with the active phase often controls the course of a catalytic reaction.Understanding the effect of the support oxide on the properties of metal nanoparticles is a challenging subject because it opens a way towards modeling and tuning of the catalytic properties by a deliberate choice of the support oxide [5][6][7][8]. As a consequence, gaining an insight into the interfacial structure between metal nanoparticles and their support, particularly under relevant reaction conditions, has been an important topic in the field of heterogeneous catalysis for decades [9,10]. Therefore,

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EPR study of platinum supported on NaY

Cited by 16 publications

References 13 publications

Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

Monomeric Chini‐Type Triplatinum Clusters Featuring Dianionic and Radical‐Anionic π*‐Systems

Metal–Support Interactions

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