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Stabilisation of water - soluble platinum nanoparticles by phosphonic acid derivatives


Richter, Mareike; Karschin, Arndt; Spingler, Bernhard; Kunz, Peter C; Meyer-Zaika, Wolfgang; Klaeui, Wolfgang (2012). Stabilisation of water - soluble platinum nanoparticles by phosphonic acid derivatives. Dalton Transactions, 41(12):3407-3413.

Abstract

Sodium 2-(diphenylphosphino)ethyl phosphonate (1) was investigated as a stabilising agent for platinum nanoparticles (Pt-NPs) in aqueous solution. This phosphino phosphonate is known to stabilise rhodium nanoparticles (NPs) in water. Here we report that in the case of Pt-NPs this ligand is indirectly involved in the stabilisation mechanism and the actual stabilisation agent is the platinum complex Na-2Pt(1)(2)] (2). The reduction of platinum(II) salts in the presence of the phosphonates 1, 2, sodium 2-(diphenylphosphoryl)ethyl phosphonate (3) and 3,3,3-triphenylpropyl phosphonate (4) leads to stable platinum NPs with a remarkably narrow particle size distribution. These platinum NPs show high catalytic activity in the hydrogenation of 1-hexene and 1-chloro-3-nitrobenzene under biphasic as well as heterogeneous (supported on charcoal) conditions. The activity of the supported NPs was 30 times higher than the commercially available catalyst Pt(0) EnCat (R). Furthermore, the single-crystal X-ray structures of (1)(MeOH)(2)(H2O)(2), (3)(H2O)(4), and (4) 2(H2O)(17) have been determined.

Abstract

Sodium 2-(diphenylphosphino)ethyl phosphonate (1) was investigated as a stabilising agent for platinum nanoparticles (Pt-NPs) in aqueous solution. This phosphino phosphonate is known to stabilise rhodium nanoparticles (NPs) in water. Here we report that in the case of Pt-NPs this ligand is indirectly involved in the stabilisation mechanism and the actual stabilisation agent is the platinum complex Na-2Pt(1)(2)] (2). The reduction of platinum(II) salts in the presence of the phosphonates 1, 2, sodium 2-(diphenylphosphoryl)ethyl phosphonate (3) and 3,3,3-triphenylpropyl phosphonate (4) leads to stable platinum NPs with a remarkably narrow particle size distribution. These platinum NPs show high catalytic activity in the hydrogenation of 1-hexene and 1-chloro-3-nitrobenzene under biphasic as well as heterogeneous (supported on charcoal) conditions. The activity of the supported NPs was 30 times higher than the commercially available catalyst Pt(0) EnCat (R). Furthermore, the single-crystal X-ray structures of (1)(MeOH)(2)(H2O)(2), (3)(H2O)(4), and (4) 2(H2O)(17) have been determined.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2012
Deposited On:17 Oct 2012 12:11
Last Modified:05 Apr 2016 15:59
Publisher:Royal Society of Chemistry
ISSN:1477-9226
Publisher DOI:https://doi.org/10.1039/c2dt12071b
Other Identification Number:ISI:000301057900008

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