| Establishing a new conductance stopped-flow apparatus to investigate the initial fast step of reaction between 1,1,1-trichloro-3-methyl-3-phospholene and methanol under a dry inert atmosphere. | |
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MedLine Citation:
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PMID: 21359285 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In the present work, for the first time, investigation of the initial fast step of reaction between 1,1,1-trichloro-3-methyl-3-phospholene (TCMP) and methanol was studied under a dry inert atmosphere by a newly constructed CSF apparatus by means of a further development in the configuration of the previous stopped-flow spectrophotometer (SFS). Hence, it was necessary to make many changes to the stopped-flow apparatus: replacement of the spectrophotometer amplifier with a conductance amplifier and the use of a conductivity cell to replace the optical one. The conductivity cell was made of polyethylene capillary tube (1 mm internal diameter; i.d.) and its inside dimensions were 1 mm i.d. × 3 mm long. Two tube electrodes which are made of stainless steel (0.8 mm i.d. × 14 mm long) were fixed at opposite ends of the observation cell and their outer surfaces were connected to the conductivity bridge amplifier by the two lead wires. The mixer was a 3-way Teflon valve and the distance between the mixer and the end of the observation cell was 30 mm. For each run, at least 24 µL of solution was required for a typical trace with a dead time of about 5 ms. Because of the extreme sensitivity of TCMP to moisture, the stopped-flow (CSF) apparatus was used inside a glove bag under a dry nitrogen atmosphere. Kinetic parameters for pseudo first-order reaction involving k(obs) = 30 s(-1) at 22 °C and activation energy E(a) = 13.55 KJ mol(-1) were successfully calculated for the initial fast step of the reaction between TCMP and methanol at 22 °C. |
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Authors:
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Sayyed Mostafa Habibi Khorassani; Ali Ebrahimi; Malek Taher Maghsoodlou; Mehdi Shahraki; Dennis Price |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-25 |
Journal Detail:
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Title: The Analyst Volume: - ISSN: 1364-5528 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-3-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372652 Medline TA: Analyst Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Chemistry, Faculty of Science, The University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran. smhabibikhorassani@yahoo.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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