Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/27661
Title: Surface chemistry of organic carbonyl compounds and their derivatives on Ni (111)
Authors: LI TINGCHENG
Keywords: Reflection spectroscopy, chemisorption, nickel, aldehydes, ketones, vibrations of adsorbed molecules
Issue Date: 5-Mar-2004
Source: LI TINGCHENG (2004-03-05). Surface chemistry of organic carbonyl compounds and their derivatives on Ni (111). ScholarBank@NUS Repository.
Abstract: The adsorption and reactions of acetaldehyde, acetone, 2,2-dimethoxypropane (DMP), 1,1-dimethoxyethane (DME), acetaldehyde (acacH), hexafluoroacetylacetone (hfacH) and trifluoroacetylacetone (tfacH) on clean and O-precovered Ni(111) have been investigated by Reflection Absorption Infrared Spectroscopy (RAIRS). Surface O is found to initiate polymerisation of acetaldehyde; while for acetone, it promotes production of eta-1(O,O)-propane-2,2-diyldioxy and stabilizes the acetone enolate formed. Coadsorbed O also facilitates the deprotonation of acacH, tfacH and hfacH on Ni(111) and stabilizes the corresponding beta-diketonate ligands, which eventually decompose through beta-scission of C-CH bond as is observed on the clean surface. On O-precovered Ni(111), DMP decomposes to yield methoxy, eta-1(O)-acetone and a methoxycarbyne species; while for DME, methoxy, eta-1(O)-acetaldehyde and methoxycarbyne are produced. Similar reaction products are observed on clean Ni(111), except that eta-1(O)-acetone and eta-1(O)-acetaldehyde are not formed.
URI: http://scholarbank.nus.edu.sg/handle/10635/27661
Appears in Collections:Ph.D Theses (Open)

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