Photoinduced charge separation of N,N,N ',N '-tetramethyl-p-phenylenediamine and N,N,N ',N '-tetramethylbenzidine in synthetic M-mordenite (M = H+, Na+, Na++K+) molecular sieves

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The photoionization of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) and N,N,N',N'-tetramethylbenzidine (TMB) in synthetic H-, Na- and Na,K-mordenite molecular sieves was examined at room temperature. It results in the formation of TMPD+ and TMB+ cation radicals, identified by EPR and diffuse reflectance spectroscopy. Alkali metal ion-exchanged mordenites assist in the formation and stabilization of TMPD+ and TMB+ cation radicals compared to H-mordenite. An electron hopping mechanism from TMPD/TMB to the mordenite surface mediated by alkali metal ions is suggested. The photoyield depends on the nature of the photoactive electron donor and the nature of the alkali metal.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2001-12
Language
English
Article Type
Article
Keywords

MONOPHOTONIC IONIZATION; ION-PAIR; PHOTOELECTRON TRANSFER; ACETONITRILE SOLUTION; ELECTRON-TRANSFER; PHOTOIONIZATION; N,N,N' ,N' -TETRAMETHYL-PARA-PHENYLENEDIAMINE; METHYLVIOLOGEN; ZEOLITES; CONVERSION

Citation

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.3, no.24, pp.5602 - 5606

ISSN
1463-9076
DOI
10.1039/b104678k
URI
http://hdl.handle.net/10203/79731
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