Triethanolamine, 2+ quenching

Treating petroleum oils with 3-5% calcium alkyl salicylate and 0.5-3% triethanolamine salts of phosphoric acid esters and ethoxylated dodecyl alcohol increases oxidation-thermal stability at 180-200°C in the manufacture of oil for metal parts quenching. The agent provides also short-term anticorrosion protection of the hardened articles [261]. Phosphoric acid salt alkyl esters are used in anticorrosives and aqueous dispersions in waterborne polyester coatings for metals [244]. 

Photosensitized generation of hydrido-metal complexes in aqueous media provides a general route for H2-evolution, hydrogenation of unsaturated substrates (i.e. olefins, acetylenes), or hydroformylation of double bonds, see Scheme 2. Co(II) complexes, i.e. Co (II)-fn s-bipyridine, Co(bpy) +, or the macrocyclic complex Co(II)-Me4[14]tetraene N4, act as homogeneous H2-evolution catalysts in photosystems composed of Ru(bpy) + (or other polypyridine (Ru(II) complexes) as photosensitizers and triethanolamine, TEOA, or ascorbic acid, HA-, as sacrificial electron donors [156,157], Reductive ET quenching of the excited photosensitizer... 

In the particular case of the carboxylates of the eosin family, a careful examination of electron transfer paths was made by K. Tokumaru and cowor-kers [158, 159, 160]. They found that eosin Y (EY ) was able to sensitize hydrogen evolution from water under visible light irradiation in a system made of an amine donor, methyl viologen (MV2+) mediator and redox catalyst such as colloidal platinum. In a water-ethanol solution of EY, in the presence of MV2+ and triethanolamine (TEOA), a maximum quantum yield of 0.3 was measured for the MV + radical cation formation. Kinetic measurements of the EY triplet quenching constant by MV2+ (kq = 3.109 M 1 s 1) and TEOA... 

Mice are perfused with 20 ml PBS and 20 ml fixative (Table 11.3C) and tissues immersed in fixative at 4°C for 30 min. Fixation with formaldehyde is quenched in cold 0.15 M triethanolamine (pH 7.5) for 30 min and two 5 min washes in cold PBS. Tissues are dehydrated in graded ethanol and embedded in paraffin. After sectioning and adhering to a coated slide, paraffin is removed by dipping three times 5 min in xylene and twice 5 min in ethanol. 

Complex formation protects the 16 excited singlet from quenching by triethanolamine. The quenching rate constant decreased from... 

The addition of hexanesulfonate (H) to a y-CD-16 solution in which the dimeric complex (y-CD-16-16-y-CD) is present led to the formation of a three-component complex y-CD-16-H [124], as shown by the decrease of the excimer fluorescence and the biphasic monomer fluorescence decay. The species with the longest lifetime (i.e., the three-component complex with T = 220 ns) was quenched by triethanolamine with lower than 3 X 10 dm mol" s" and by Oj with fc, = 4 x 10 dm mol" s" . For all other forms of the CD-16 complex studied in [124], the corresponding kq are higher, that is, the best protection against the quenching is offered to 11 by the three-component complex. 

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