1
|
Zhao P, Lei H, Ni C, Guo JD, Kamali S, Fettinger JC, Grandjean F, Long GJ, Nagase S, Power PP. Quasi-three-coordinate iron and cobalt terphenoxide complexes {Ar(iPr8)OM(μ-O)}2 (Ar(iPr8) = C6H-2,6-(C6H2-2,4,6-(i)Pr3)2-3,5-(i)Pr2; M = Fe or Co) with M(III)2(μ-O)2 core structures and the peroxide dimer of 2-oxepinoxy relevant to benzene oxidation. Inorg Chem 2015; 54:8914-22. [PMID: 26331405 DOI: 10.1021/acs.inorgchem.5b00930] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The bis(μ-oxo) dimeric complexes {Ar(iPr8)OM(μ-O)}2 (Ar(iPr8) = C6H-2,6-(C6H2-2,4,6-(i)Pr3)2-3,5-(i)Pr2; M = Fe (1), Co (2)) were prepared by oxidation of the M(I) half-sandwich complexes {Ar(iPr8)M(η(6)-arene)} (arene = benzene or toluene). Iron species 1 was prepared by reacting {Ar(iPr8)Fe(η(6)-benzene)} with N2O or O2, and cobalt species 2 was prepared by reacting {Ar(iPr8)Co(η(6)-toluene)} with O2. Both 1 and 2 were characterized by X-ray crystallography, UV-vis spectroscopy, magnetic measurements, and, in the case of 1, Mössbauer spectroscopy. The solid-state structures of both compounds reveal unique M2(μ-O)2 (M = Fe (1), Co(2)) cores with formally three-coordinate metal ions. The Fe···Fe separation in 1 bears a resemblance to that in the Fe2(μ-O)2 diamond core proposed for the methane monooxygenase intermediate Q. The structural differences between 1 and 2 are reflected in rather differing magnetic behavior. Compound 2 is thermally unstable, and its decomposition at room temperature resulted in the oxidation of the Ar(iPr8) ligand via oxygen insertion and addition to the central aryl ring of the terphenyl ligand to produce the 5,5'-peroxy-bis[4,6-(i)Pr2-3,7-bis(2,4,6-(i)Pr3-phenyl)oxepin-2(5H)-one] (3). The structure of the oxidized terphenyl species is closely related to that of a key intermediate proposed for the oxidation of benzene.
Collapse
Affiliation(s)
- Pei Zhao
- Department of Chemistry, University of California , Davis, California 95616, United States
| | - Hao Lei
- Department of Chemistry, University of California , Davis, California 95616, United States
| | - Chengbao Ni
- Department of Chemistry, University of California , Davis, California 95616, United States
| | - Jing-Dong Guo
- Fukui Institute for Fundamental Chemistry, Kyoto University , Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
| | - Saeed Kamali
- Department of Chemistry, University of California , Davis, California 95616, United States
| | - James C Fettinger
- Department of Chemistry, University of California , Davis, California 95616, United States
| | - Fernande Grandjean
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri , Rolla, Missouri 65409-0010, United States
| | - Gary J Long
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri , Rolla, Missouri 65409-0010, United States
| | - Shigeru Nagase
- Fukui Institute for Fundamental Chemistry, Kyoto University , Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
| | - Philip P Power
- Department of Chemistry, University of California , Davis, California 95616, United States
| |
Collapse
|
2
|
YAMADA E, FUSE Y. On-site Monitoring of Volatile Organic Compounds (VOCs) in the Atmosphere and Indoors. BUNSEKI KAGAKU 2011. [DOI: 10.2116/bunsekikagaku.60.459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Etsu YAMADA
- Center for Environmental Science, Kyoto Institute of Technology
| | - Yasuro FUSE
- Center for Environmental Science, Kyoto Institute of Technology
| |
Collapse
|
4
|
Seethapathy S, Górecki T, Li X. Passive sampling in environmental analysis. J Chromatogr A 2007; 1184:234-53. [PMID: 17719053 DOI: 10.1016/j.chroma.2007.07.070] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Revised: 07/26/2007] [Accepted: 07/27/2007] [Indexed: 10/23/2022]
Abstract
Since its invention more than three decades ago, passive sampling technology has been widely used for environmental monitoring throughout the world. In many cases, it is the only practical means of determining pollution levels caused by numerous anthropogenic chemicals. Passive sampling technology today is used in various areas ranging from workplace exposure monitoring to global issues of climate change arising due to the presence of various chemicals in the atmosphere. In this review, the present status of the technology and its applications will be discussed along with aspects related to its regulatory acceptance and recent trends.
Collapse
Affiliation(s)
- Suresh Seethapathy
- Department of Chemistry, University of Waterloo, 200 University Avenue W., Waterloo, Ontario N2L 3G1, Canada
| | | | | |
Collapse
|
5
|
Demeestere K, Dewulf J, De Witte B, Van Langenhove H. Sample preparation for the analysis of volatile organic compounds in air and water matrices. J Chromatogr A 2007; 1153:130-44. [PMID: 17258752 DOI: 10.1016/j.chroma.2007.01.012] [Citation(s) in RCA: 258] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Revised: 12/13/2006] [Accepted: 01/04/2007] [Indexed: 11/24/2022]
Abstract
This review summarizes literature data from the past 5 years on new developments and/or applications of sample preparation methods for analysis of volatile organic compounds (VOC), mainly in air and water matrices. Novel trends in the optimization and application of well-established airborne VOC enrichment techniques are discussed, like the implementation of advanced cooling systems in cryogenic trapping and miniaturization in adsorptive enrichment techniques. Next, focus is put on current tendencies in integrated sampling-extraction-sample introduction methods such as solid phase microextraction (SPME) and novel in-needle trapping devices. Particular attention is paid to emerging membrane extraction techniques such as membrane inlet mass spectrometry (MIMS) and membrane extraction with a sorbent interface (MESI). For VOC enrichment out of water, recent evolutions in direct aqueous injection (DAI) and liquid-liquid extraction (LLE) are highlighted, with main focus on miniaturized solvent extraction methods such as single drop microextraction (SDME) and liquid phase microextraction (LPME). Next, solvent-free sorptive enrichment receives major attention, with particular interest for innovative techniques such as stir bar sorptive extraction (SBSE) and solid phase dynamic extraction (SPDE). Finally, recent trends in membrane extraction are reviewed. Applications in both immersion and headspace mode are discussed.
Collapse
Affiliation(s)
- Kristof Demeestere
- Research Group EnVOC, Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | | | | | | |
Collapse
|
6
|
Partyka M, Zabiegała B, Namiésnik J, Przyjazny A. Application of Passive Samplers in Monitoring of Organic Constituents of Air. Crit Rev Anal Chem 2007. [DOI: 10.1080/10408340600976523] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
7
|
Yamada E, Matsushita K, Nakamura M, Fuse Y, Miki S, Morita H, Shimada O. Continuous Analysis of Volatile Organic Compounds (VOCs) in the Research Practice. CHEM LETT 2005. [DOI: 10.1246/cl.2005.772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
8
|
Kroner SM, Dematteo MP, Hadad CM, Carpenter BK. The Gas-Phase Acidity of 2(3H)-Oxepinone: A Step toward an Experimental Heat of Formation for the 2-Oxepinoxy Radical. J Am Chem Soc 2005; 127:7466-73. [PMID: 15898796 DOI: 10.1021/ja050173u] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In an effort to gain further insight into the oxidation of the phenyl radical, this contribution details the first of three experiments designed to establish the heat of formation of the 2-oxepinoxy radical. We report here the synthesis of the previously unknown 2(7H)-oxepinone (12a) and 2(3H)-oxepinone (12b). We have determined the gas-phase acidity (Delta(acid)H(298)) of 12b by means of a bracketing study employing a flowing afterglow apparatus with quadrupole mass spectrometric detection. In this experiment, compound 12b was reacted in the gas phase with a series of bases of varying strength. A proton-transfer reaction was observed when 12b was reacted with t-BuS(-), but not when 12b was reacted with HS(-). We conclude that the gas-phase acidity of 12b lies between those of t-BuSH and H(2)S, and it is thereby assigned a value of Delta(acid)H(298) = 352 +/- 2 kcal/mol. Additional support for this value was found by performing the reverse reactions (i.e. the 2-oxepinoxy anion (15a) was reacted with proton sources of differing acidities). Anion 15a underwent a proton-transfer reaction with H(2)S but not with t-BuSH, in agreement with the results from the forward reactions. The experimental value of the gas-phase acidity agrees well with those from DFT calculations, which predicted Delta(acid)H(298) = 348.9 kcal/mol at the B3LYP/6-31+G(d) level and 349.2 kcal/mol at the B3LYP/aug-cc-pVTZ level.
Collapse
Affiliation(s)
- Steven M Kroner
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, USA
| | | | | | | |
Collapse
|
9
|
MATSUSHITA K, NAKAMURA M, FUSE Y, YAMADA E. Observation of Annual Changes in Concentrations of Atmospheric VOCs by the Collection with Passive Samplers (2001-2004). BUNSEKI KAGAKU 2005. [DOI: 10.2116/bunsekikagaku.54.849] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Kazumasa MATSUSHITA
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
| | - Mitsuaki NAKAMURA
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
| | - Yasuro FUSE
- Center for Environmental Science, Kyoto Institute of Technology
| | - Etsu YAMADA
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
- Center for Environmental Science, Kyoto Institute of Technology
| |
Collapse
|
10
|
Merle JK, Hadad CM. Computational Study of the Oxygen Initiated Decomposition of 2-Oxepinoxy Radical: A Key Intermediate in the Oxidation of Benzene. J Phys Chem A 2004. [DOI: 10.1021/jp047317w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John K. Merle
- Department of Chemistry, 100 West 18th Avenue, The Ohio State University, Columbus, Ohio 43210
| | - Christopher M. Hadad
- Department of Chemistry, 100 West 18th Avenue, The Ohio State University, Columbus, Ohio 43210
| |
Collapse
|