Oxygen studies

The interaction of small, well defined, rhodium clusters, Rh and Rhs, with O2 has been investigated (220) by matrix infrared, and UV-visible, spectroscopy, coupled with metal/02 concentration studies, warm-up experiments, and isotopic oxygen studies. A number of binuclear O2 complexes were identified, with stoichiometries Rh2(02)n, n = 1-4. In addition, a trinuclear species Rhs(02)m, m = 2 or 6, was identified. The infrared data for these complexes, as well as for the mononuclear complexes Rh(02)x, = 1-2 (229), are summarized in Table XI. Metal-concentration plots that led to the determination of... 

Flower, R.W. and Patz, A. (1971). Oxygen studies in retrolental fibroplasia. IX. The effects of elevated arterial oxygen tension on retinal vascular dynamics in the kitten. Arch. Ophthamol. 85, 197-208. 

Theis, F.V., and Freeland, M.R. (1941) Thrombo-angiids obliterans clinical observations and arterial blood oxygen studies during treatment of the disease with sodium tetrathionate and sodium thiosulfates. Ann. Surg. 113(3), 411-423. 

It was presumed that the more flexible (CH2) linker and the absence of an obvious position for electrophilic attack such as is found in system Cu2(R-XYL-H)]2+, as seen in Figure 5.14, would lead to more rapid oxygenation reactions and a more stable complex than that formed from [Cu2(R-XYL-H)]2+. Instead the researchers found a more complex system in kinetically controlled oxygenation studies. Two different peroxo complexes form via a postulated open-chain superoxo species as shown in the scheme shown in Figure 5.17.41a... 

Singlet-oxygen studies have being reported to such diverse areas as chemiluminescence [14], photocarcinogenity [15], ozonolysis [16], photodynamic action [17], peroxide decomposition [7], photosynthesis [14], air pollution [18], metallocatalyzed oxygenation reactions [19,20], synthetic applications [21], and polymer degradation [10]. 

Karchmer, J.H. Polarographic Determination of Dissolved Oxygen. Study... 

Warman JM, Cooper R. (1990) Electron thermalization and attachment in pulse-irradiated oxygen studied by time-resolved microwave conductivity. Radiat Phys Chem 36 517-521. 

Golodets G.I., Heterogeneous Catalytic Reactions involving Molecular Oxygen Studies in Surface Science and Catalysis, Vol 15, (Elsevier Amsterdam 1991) 437-469. 

BrezisM, Heyman SN, Dinour D, Epstein FH, Rosen S Role of nitric oxide in renal medullary oxygenation. Studies in isolated and intact rat kidneys. J Clin Invest 88 390-5,1991... 

Devins (18) assumed that the ozonizer discharges in oxygen studied by him may be regarded as similar to the more or less ideal plasma of the uniform positive column of a glow discharge because, in other experiments, Manley (52) found that, at atmospheric pressure, X/p is nearly independent of the alternating potential applied to the electrodes. 

Melanin formation via microsomes in presence of an NADPH-generating system and molecular oxygen Study of melanin formation via polyphenol oxidase... 

Mononuclear cobalt(II) carboxylate complexes Synthesis, molecular structure and selective oxygenation study NCMe r //va V/ 6 =7 ygi 18... 

Iwasaki, H. and Yasuhiro Ogino, "Permeability of Laminated Ethylene-vinyl Alcohol Copolymer to Oxygen (Studies on Gas Barrier Resin EVAL -No. 4", Kobunshi Ronbunshu 1978,. 35. pp 487-492. 

Mehler AH (1951) Studies on reactions of illuminated chloroplasts. I. Mechanisms of the reduction of oxygen and other Hill reagents. Arch Biochem Biophys 33 65-77 Mehler AH and Brown AH (1952) Studies on reactions of illuminated chloroplasts. HI. Simultaneous photoproduction and consumption of oxygen studied with oxygen isotopes. Arch Biochem Biophys 38 365-370 Melis A(1996) Excitation energy transfer functional anddynamic aspects of Lhc (cab) proteins. In Ort DR and Yocum CF (eds) Oxygenic Photosynthesis, pp 523-538. Kluwer Academic Publishers, Dordrecht... 

Large quantities of dichlorodifluoromethane and other chlorofluorocarbons ( Freons ) are used as aerosol propellants, and it has been calculated that there is a danger of reducing the earth s protective ozone layer following photolysis to produce chlorine atoms in the upper atmosphere.184 Milstein and Rowland185 have now measured quantum yields of unity for CF2C12 dissociation [reaction (36)] and for appearance of photo-oxidation products in oxygen. Studies of the... 

G.I. Golodets, Heterogeneous Catalytic Reactions Involving Molecular Oxygen, Studies in Surface Science and Catalysis, Elsevier, Amsterdam, 15, (1982). 

A mechanistic similarity is suggested. Now the value of E° for the couple H0o -02 is between 0.1 and 0.55 (19, 38), so that the reaction of the metal ions with oxygen studied here is unlikely to proceed via HO > for thermodynamic reasons. However, the autoxidation of the metal and reduction of oxygen may well occur via the formation of a complex, such as Fe02 ... 

On the basis of photo-oxygenation studies of certain carotenoids and the synthesis of optically active ethyl abscisate, the absolute configuration of (-1- )-abscisic acid has been revised to S and is therefore defined by structure (40). Radioactive derivatives of abscisic acid have been prepared for biological studies. These include samples with labelling at C-10 and labelling at C-2, C-4, and the methyl group on C-5. ... 

The reactions leading to H (H20) in moist oxygen studied with the same apparatus and method are shown in Table III. This reaction sequence is more interesting and more complicated since the direct charge transfer... 

Read, G., and P. J. C. Walker Oxygenation Studies. Part 2. Rhodium(l)-catalyzed Autoxidation of Oct-l-ene at Ambient Temperature and Pressure. J. Chem. Soc. (London) Dalton Trans. 1977, 883. 

---