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Abstract
Low pressure flash thermolysis of different precursor molecules containing-ClO, -ClO3 or -OClO3 yield, when highly diluted in Ne or O2 and subsequent quenching of the products in a matrix at 5 or 15 K, ClOx (x = 1, 3, 4) radicals, respectively. If Ne or O2 gas is directed over solid ClO2 at -120 degrees C and the resulting gas mixtures are immediately deposited as a matrix, a high fraction of (OClO)2 is trapped. This enables recording of IR and UV spectra of weakly bonded (OClO)2 dimers and detailed studying of their photochemistry. For Ne or O2 matrix isolated ClO radicals the vibrational wavenumbers and electronic transitions are only slightly affected compared with the gas phase. In this study strong evidence is found for long lived ClO in the electronically excited 2 [symbol: see text] 1/2 state. A comprehensive IR study of Ne matrix isolated ClO3 (fundamentals at 1081, 905, 567, 476 cm-1) yield i) a reliable force field; ii) a OClO bond angle of alpha e = 113.8 +/- 1 degrees and iii) a ClO bond length of 148.5 +/- 2 pm in agreement with predicted data from quantum chemical calculations. The UV/Vis spectrum of ClO3 isolated in a Ne matrix (lambda max at 32,100 and 23,150 cm-1) agrees well with the photoelectron spectrum of ClO3- and theoretical predictions. The origin of the structured high energy absorption is at 22,696 cm-1 and three fundamentals (794, 498, 280 cm-1) are detected in the C2E state. By photolysis of ClO3 with visible light the complex ClO.O2 with ClO in the 2 [symbol: see text] 1/2 state is formed. In an extended spectroscopic study of the elusive ClO4 radical, isolated in a Ne or O2 matrix, three additional IR bands, a complete UV spectrum and a strong interaction with O2 are found. This leads to the conclusion that ClO4 exhibits C2v or Cs symmetry with a shallow potential minimum and forms with O2 the previously unknown peroxy radical O3ClO-O2. All these results are discussed in the context of recent developments in the chemistry and spectroscopy of the important and interesting ClOx (x = 1-4) family of radicals.
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Affiliation(s)
- Rodion Kopitzky
- Fakultät 4, Anorganische Chemie Gerhard-Mercator Universität Duisburg, Lotharstrasse 1 47048 Duisburg, Germany
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Gotte V, Goulon J, Goulon-Ginet C, Rogalev A, Natoli CR, Perié K, Barbe JM, Guilard R. Structural Studies Using X-ray Absorption Spectroscopy of Intermediates Formed by Reaction of Ozone with Halogeno(dodecaphenylporphyrinato)manganese(III) Derivatives. J Phys Chem B 2000. [DOI: 10.1021/jp992398v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent Gotte
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - José Goulon
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Chantal Goulon-Ginet
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Andrei Rogalev
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Calogero R. Natoli
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Karine Perié
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Jean-Michel Barbe
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
| | - Roger Guilard
- European Synchrotron Radiation Facility (ESRF), Boite Postale 220, F-38043 Grenoble Cedex, France, Université Joseph Fourier, Faculté de Pharmacie, F-38706 La Tronche, France, Laboratori Nazionali di Frascati dell'Istituto Nazionale di Fisica Nucleare, P.O. Box 13, I-00044 Frascati, Italy, and Laboratoire d'Ingéniérie Moléculaire pour la Séparation et les Applications des Gaz (LIMSAG), UMR 5633 CNRS-AIR LIQUIDE, Université de Bourgogne, Faculté des Sciences Gabriel, Boulevard Gabriel, F-21100 Dijon, France
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