1999
DOI: 10.1002/(sici)1521-3757(19991216)111:24<3941::aid-ange3941>3.0.co;2-i
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[Pt19(CO)21(NO)]3− und [Pt38(CO)44]2−: Biegung einer Nitrosylgruppe durch intramolekulare Elektronenübertragung als Zwischenschritt bei der Bildung eines kubisch dichtest gepackten Platincarbonylclusters aus einem Polydecker

Abstract: In memoriam Paolo ChiniVielkernige Carbonylmetallcluster (high-nuclearity carbonyl clusters, HNCCs) werden oft als ausgezeichnte Modellsysteme angesehen, anhand derer man Vorgänge, wie die Chemisorption und die katalytische Aktivität, die für kleine Metallpartikel von Bedeutung sind, untersuchen kann. Diese Vorgänge sind in hohem Maû von der lokalen Struktur der aktiven Stellen (exponierte Flächen, Oberflächendefekte, Knicke, Stufen) abhänging. [1] Zwar wurden in HNCCs einige Arten von Metallpackungen angetrof… Show more

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Cited by 7 publications
(2 citation statements)
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“…However, the lower coordination of Pt should stem from electronic factors. The coordination of the Ni, Pd and Pt metal atoms centring the ν 3 ‐triangular faces of [HNi 38 Pt 6 (CO) 48 ] 5− ,5 [Ni 24 (Ni 14− x Pt x )Pt 6 (CO) 48 ] 6− , [Ni 30 (Ni 8− x Pd x )Pd 6 (CO) 48 ] 6− , as well as the [Ni 24 Pt 14 (CO) 44 ] 4− 7 and [Pt 38 (CO) 44 ] 2− 30 pair of compounds, nicely matches the CO adsorption behaviour of corresponding terrace atoms belonging to close‐packed (111) surface layers of Ni, Pd and Pt crystals. At ${{ 1/3 }}$ CO coverage, both experimental and theoretical results indicate that Pd is bound three‐fold, Ni two‐ and three‐fold and Pt on‐top of CO, respectively 31.…”
Section: Resultsmentioning
confidence: 70%
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“…However, the lower coordination of Pt should stem from electronic factors. The coordination of the Ni, Pd and Pt metal atoms centring the ν 3 ‐triangular faces of [HNi 38 Pt 6 (CO) 48 ] 5− ,5 [Ni 24 (Ni 14− x Pt x )Pt 6 (CO) 48 ] 6− , [Ni 30 (Ni 8− x Pd x )Pd 6 (CO) 48 ] 6− , as well as the [Ni 24 Pt 14 (CO) 44 ] 4− 7 and [Pt 38 (CO) 44 ] 2− 30 pair of compounds, nicely matches the CO adsorption behaviour of corresponding terrace atoms belonging to close‐packed (111) surface layers of Ni, Pd and Pt crystals. At ${{ 1/3 }}$ CO coverage, both experimental and theoretical results indicate that Pd is bound three‐fold, Ni two‐ and three‐fold and Pt on‐top of CO, respectively 31.…”
Section: Resultsmentioning
confidence: 70%
“…A comparison between the chemical and electrochemical properties of [H 6− n Ni 35 Pt 9 (CO) 48 ] n − and [H 6− n Ni 38 Pt 6 (CO) 48 ] n − ( n = 5, 6) indicates that surface Pt atoms decrease the propensity of the cluster to partially substitute its free negative charge with hydride atoms and limit the range of n values of the non‐isoelectronic series of [Ni 35 Pt 9 (CO) 48 ] n − derivatives. Therefore, it seems conceivable to speculate that the truncated octahedral structures of [Ni 24 Pt 14 (CO) 44 ] 4− 7 and [Pt 38 (CO) 44 ] 2− 30 directly ensue from a progressive destabilisation of the [Ni 44− x Pt x ] ν 3 octahedron as the amount of Pt increases. The effect of Pd seems to be different.…”
Section: Resultsmentioning
confidence: 99%