Preparation of organic solutions or solid films of small particles of ruthenium, palladium, and platinum from organometallic precursors in the presence of cellulose derivatives

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00027a017· OSTI ID:6953908

Duteil, A; Queau, R; Chaudret, B ^[1]; Mazel, R; Roucau, C ^[2]; Bradley, J S ^[3]

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1. l'Universite Paul Sabatier, Toulouse (France)
2. CEMES-LOE-CNRES29, Toulouse (France)
3. Exxon Research and Engineering Co., Annandale, NJ (United States)

Reaction of Ru(cod)(cot) with hydrogen in the presence of nitrocellulose (NC) or cellulose acetate (CA) at 20[degree]C yields colloidal ruthenium solutions containing particles of 10, 15, and 20 [angstrom], respectively, and showing a low dispersity for concentrations in Ru of 2, 5, and 10 wt% (NC) or particles of average size 15, 20, and 25 [angstrom] for concentrations in Ru of 2, 5, and 10 wt% (CA). No change in particle size is observed upon reaction with CO in NC whereas agglomeration occurs in CA. The infrared spectra of CO adsorbed on Ru colloids have been recorded. Whatever the stabilizing polymer, two bands were observed. A band at 2030 cm[sup [minus]1] has been assigned to the stretching vibration of CO linearly adsorbed on the Ru surface. A low-frequency band at 1965 cm[sup [minus]1] has been assigned to bridging CO. The relative intensities of these two bands were found to vary with particle size. Reaction of M(dba)[sub 2] (M = Pd, Pt; dba = dibenzylidene acetone) under CO in the presence of NC or AC leads to colloidal solutions containing small metal particles (respectively 35 [angstrom] for Pd in NC or CA, 12 [angstrom] for Pt in NC, 15 [angstrom] for Pt in CA independent of metal/polymer concentration). The presence of coordinated CO was observed in all cases. At maximum coverage, palladium colloids showed 3-fold and 2-fold bridging CO respectively at 1950 and 1890 cm[sup [minus]1]; platinum colloids showed both bridging and terminal CO at 1880 and 2050 cm[sup [minus]1]. 35 refs., 7 figs.

• OSTI ID: 6953908
• Journal Information: Chemistry of Materials; (United States), Vol. 5:3; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
CARBON MONOXIDE
ABSORPTION SPECTROSCOPY
PALLADIUM COMPOUNDS
CHEMICAL PREPARATION
PLATINUM COMPOUNDS
RUTHENIUM COMPOUNDS
COLLOIDS
FILMS
MOLECULAR STRUCTURE
ORGANIC POLYMERS
SORPTIVE PROPERTIES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYMERS
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
400201 - Chemical & Physicochemical Properties
020400 - Petroleum- Processing