Issue 24, 2000

Stable subnanometre Pt clusters in zeolite NaX [italic v (to differentiate from Times ital nu)]ia stoichiometric carbonyl complexes: Probing of negative charge by DRIFT spectroscopy of adsorbed CO and H2

Abstract

Negatively charged platinum carbonyl Chini complexes [Pt3(CO)6]n2− with n = 2–4 were synthesized by reductive carbonylation of Pt2+ in NaX zeolite and subsequently decomposed in vacuum at temperatures up to 773 K. The Pt clusters obtained preserved a low nuclearity, evidenced by rapid recarbonylation resulting in regeneration of the initial carbonyl Chini complexes. The electronic state of the metal clusters was probed by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy of chemisorbed CO and H2. A strong electron donor capacity of Pt was indicated by the bands of (i) the linearly bonded CO at 1958–1976 cm−1 and (ii) the stretching frequency of terminal platinum hydrides at 2040 cm−1. It was concluded that the strong donor properties have to be attributed to negative charging of the Pt clusters, originating from the precursor carbonyl complex.

Article information

Article type
Paper
Submitted
14 Aug 2000
Accepted
03 Nov 2000
First published
24 Nov 2000

Phys. Chem. Chem. Phys., 2000,2, 5647-5652

Stable subnanometre Pt clusters in zeolite NaX [italic v (to differentiate from Times ital nu)]ia stoichiometric carbonyl complexes: Probing of negative charge by DRIFT spectroscopy of adsorbed CO and H2

A. I. Serykh, O. P. Tkachenko, V. Yu. Borovkov, V. B. Kazansky, M. Beneke, N. I. Jaeger and G. Schulz-Ekloff, Phys. Chem. Chem. Phys., 2000, 2, 5647 DOI: 10.1039/B006609P

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