Comparative IR Study of Nitric Oxide Reactions with Sublimed Layers of Iron(II)− and Ruthenium(II)−meso-Tetraphenylporphyrinates

Comparative IR Study of Nitric Oxide Reactions with Sublimed Layers of Iron(II)− and Ruthenium(II)−meso-Tetraphenylporphyrinates

The interactions of nitric oxide gas with thin layers of FeII(TPP) and RuII(TPP), obtained by sublimation onto low-temperature substrate (77 K), has been investigated by means of IR spectroscopy (TPP = meso-tetraphenylporphyrinate). Only simple addition of NO to form Fe(TPP)(NO) is observed for the...

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Veröffentlicht in:Journal of the American Chemical Society 2002-08, Vol.124 (34), p.10124-10129
Hauptverfasser: Kurtikyan, Tigran S, Martirosyan, Garik G, Lorkovic', Ivan M, Ford, Peter C
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Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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container_end_page 10129
container_issue 34
container_start_page 10124
container_title Journal of the American Chemical Society
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creator Kurtikyan, Tigran S
Martirosyan, Garik G
Lorkovic', Ivan M
Ford, Peter C
description The interactions of nitric oxide gas with thin layers of FeII(TPP) and RuII(TPP), obtained by sublimation onto low-temperature substrate (77 K), has been investigated by means of IR spectroscopy (TPP = meso-tetraphenylporphyrinate). Only simple addition of NO to form Fe(TPP)(NO) is observed for the iron−porphyrin FeII(TPP), while, in contrast, RuII(TPP) promotes NO disproportionation to form the nitrosyl−nitrito complex Ru(TPP)(NO)(ONO) and N2O. Thin layers of Fe(TPP)(NO) are inert to further reaction with excess NO; however, the nitrosyl−nitro complex Fe(TPP)(NO)(NO2) is readily formed when traces of dioxygen are added to the NO atmosphere. When the NO2 concentrations in the NO/NO2 mixture are relatively high, the nitrato complex Fe(TPP)(NO3) is also formed. Spectral data are given indicating that moderate shifts in the nitrosyl stretching frequency of Fe(TPP)(NO) are due to crystal packing effects, rather than to the H-bonding of coordinated NO with protic contaminants suggested in an earlier publication. Removal of NO by exhaustive evacuation from layers containing Fe(TPP)(NO)(NO2) leads to formation of Fe(TPP)(NO) and Fe(TPP)(NO3).
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Only simple addition of NO to form Fe(TPP)(NO) is observed for the iron−porphyrin FeII(TPP), while, in contrast, RuII(TPP) promotes NO disproportionation to form the nitrosyl−nitrito complex Ru(TPP)(NO)(ONO) and N2O. Thin layers of Fe(TPP)(NO) are inert to further reaction with excess NO; however, the nitrosyl−nitro complex Fe(TPP)(NO)(NO2) is readily formed when traces of dioxygen are added to the NO atmosphere. When the NO2 concentrations in the NO/NO2 mixture are relatively high, the nitrato complex Fe(TPP)(NO3) is also formed. Spectral data are given indicating that moderate shifts in the nitrosyl stretching frequency of Fe(TPP)(NO) are due to crystal packing effects, rather than to the H-bonding of coordinated NO with protic contaminants suggested in an earlier publication. 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Am. Chem. Soc</addtitle><description>The interactions of nitric oxide gas with thin layers of FeII(TPP) and RuII(TPP), obtained by sublimation onto low-temperature substrate (77 K), has been investigated by means of IR spectroscopy (TPP = meso-tetraphenylporphyrinate). Only simple addition of NO to form Fe(TPP)(NO) is observed for the iron−porphyrin FeII(TPP), while, in contrast, RuII(TPP) promotes NO disproportionation to form the nitrosyl−nitrito complex Ru(TPP)(NO)(ONO) and N2O. Thin layers of Fe(TPP)(NO) are inert to further reaction with excess NO; however, the nitrosyl−nitro complex Fe(TPP)(NO)(NO2) is readily formed when traces of dioxygen are added to the NO atmosphere. When the NO2 concentrations in the NO/NO2 mixture are relatively high, the nitrato complex Fe(TPP)(NO3) is also formed. Spectral data are given indicating that moderate shifts in the nitrosyl stretching frequency of Fe(TPP)(NO) are due to crystal packing effects, rather than to the H-bonding of coordinated NO with protic contaminants suggested in an earlier publication. 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Am. Chem. Soc</addtitle><date>2002-08-28</date><risdate>2002</risdate><volume>124</volume><issue>34</issue><spage>10124</spage><epage>10129</epage><pages>10124-10129</pages><issn>0002-7863</issn><eissn>1520-5126</eissn><coden>JACSAT</coden><abstract>The interactions of nitric oxide gas with thin layers of FeII(TPP) and RuII(TPP), obtained by sublimation onto low-temperature substrate (77 K), has been investigated by means of IR spectroscopy (TPP = meso-tetraphenylporphyrinate). Only simple addition of NO to form Fe(TPP)(NO) is observed for the iron−porphyrin FeII(TPP), while, in contrast, RuII(TPP) promotes NO disproportionation to form the nitrosyl−nitrito complex Ru(TPP)(NO)(ONO) and N2O. Thin layers of Fe(TPP)(NO) are inert to further reaction with excess NO; however, the nitrosyl−nitro complex Fe(TPP)(NO)(NO2) is readily formed when traces of dioxygen are added to the NO atmosphere. When the NO2 concentrations in the NO/NO2 mixture are relatively high, the nitrato complex Fe(TPP)(NO3) is also formed. Spectral data are given indicating that moderate shifts in the nitrosyl stretching frequency of Fe(TPP)(NO) are due to crystal packing effects, rather than to the H-bonding of coordinated NO with protic contaminants suggested in an earlier publication. Removal of NO by exhaustive evacuation from layers containing Fe(TPP)(NO)(NO2) leads to formation of Fe(TPP)(NO) and Fe(TPP)(NO3).</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>12188676</pmid><doi>10.1021/ja0269688</doi><tpages>6</tpages></addata></record>
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subjects Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
title Comparative IR Study of Nitric Oxide Reactions with Sublimed Layers of Iron(II)− and Ruthenium(II)−meso-Tetraphenylporphyrinates
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