Ozone, chemistry

Because the protonation of ozone removes its dipolar nature, the electrophilic chemistry of HOs, a very efficient oxygenating electrophile, has no relevance to conventional ozone chemistry. The superacid-catalyzed reaction of isobutane with ozone giving acetone and methyl alcohol, the aliphatic equivalent of the industrially significant Hock-reaction of cumene, is illustrative. 

Understand how photolysis produces radicals by bond cleavage and account for the importance of radical species in photochemical chain reactions, stratospheric ozone chemistry and the photochemistry of the polluted troposphere. 

Recent discussions of stratospheric chemistry have dealt with the effect of freons on ozone balance through a Cl/ClO catalytic destruction of ozone. The fundamental absorption band of CIO is measured to be at 11 /xm. Isotopically substituted CO2 laser based OA absorption measurement technique should allow us to carry out fundamental measurements on CIO and its diurnal variation in the stratosphere to provide yet another important parameter (in addition to NO above) in the stratospheric ozone chemistry. 

Ozone Chemistry, Photo and Singled Oxygen and Biochemical Oxidations... 

Lelieveld, J., and R. van Dorland, Ozone Chemistry Changes in the Troposphere and Consequent Radiative Forcing of Climate, in NATO AS 1 Series, 132, (1995). 

For those more inclined to use environmental topics to enrich thermodynamics and kinetics parts of the physical chemistry curriculum, Modeling Stratospheric Ozone Chemistry and the Contrail projects are two examples. 

Nitrogen oxides play a key role in ozone chemistry. Paul Crutzen (1933—) received the 1995 Nobel Prize in chemistry for research that helped define the role of nitrogen oxides in ozone depletion. 

The Photochemical Activity and solar Ultraviolet Radiation (PAUR I) and Photochemical Activity and solar Ultraviolet Radiation Modulation Factors (PAUR II) projects had the aim of studying various aspects of ultraviolet radiation and photochemistry interrelationships. PAUR I aimed at studying the interrelationships between total ozone, UV-B radiation, aerosol load, air pollutants, photodissociation rates of N02 and 03 and tropospheric ozone. PAUR II has the aim of studying the interactions between UV-B, total ozone, tropospheric ozone and photochemical activity in the presence of alternating maritime and Saharan aerosols. The present paper presents the main concepts underlying the two projects, the approach followed and a brief overview of some of the results obtained so far. Further, the main results of PAUR I that are relevant to tropospheric ozone chemistry over the Eastern Mediterranean are presented. 

It is beyond the scope of this article and its space limitations to give a full and extensive account of the results of the two projects. Instead, we will here briefly state the main results obtained, and then present a fraction of these results that are relevant to the ozone chemistry over Eastern Mediterranean. 

Lelieveld, J. and R. van Dorland, Ozone chemistry changes in the troposphere and consequent radiative forcing of climate, in Atmospheric Ozone as a Climate Gas, edited by W-C. Wang and l.S.A. lsaksen. Springer, Berlin, 1995. 

While a comparison of rates can demonstrate relevance, indoor ozone chemistry becomes even more interesting when pathways and products of the oxidation are studied in detail, such as for the a-pinene-ozone reaction (Scheme 13.1). Ozone adds across the ring-bound double bond forming a primary ozonide. This... 

Role of the reaction of IQ with DMS. The IO + DMS reaction may have an impact on both the iodine-ozone chemistry and on the fate of DMS in the atmosphere. 

In summary, the IO + DMS reaction appears to be potentially important in iodine-ozone chemistry and in controlling the DMS behavior in the marine atmosphere. However, the role of this reaction remains to be confirmed by direct field measurements of key species such as IO and CH3I and also by further laboratory measurements on key reactions of the atmospheric iodine chemistry. 

Since the literature on ozone chemistry is enormous, readers are directed to earlier publications (47-49). Most of the chemical literature describes reactions of ozone in organic solvents, where ozonides are relatively stable and controlled degradation under reducing or oxidizing... 

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