two novel examples of hydroxylation of aromatic rings in coordination chemistry

two novel examples of this reaction are reported, each occurring in a coordination complex in which the aryl group is part of an arylazo function. the parent complexes are dichloro(2-m-tolylazopyridine)palladium(ii) and trans-bis(phenylazoacetaldoximato)platinum(ii). refs

poly-c van de graaff belts

a new material called poly-c is recommended for carrying positive charge to the terminal of a van de graaff accelerator compared to the rubberized cotton belt, the new belt gives superior performance in every way at a much lower cost. the poly-c can be purchased as a flat sheet and joined into a continuous loop after it has been inserted ..

observation of optical pumping effects in collinear atomic beam - laser beam(s) interaction

the detection of optical resonances by observation of the fluorescence light emitted from a fast atomic beam of na interacting with a collinear laser beam is limited in sensitivity by optical pumping processes. in the experiment reported here advantage is taken of the optical pumping by using a second collinear laser beam, achieving then ..

reaction of redox proteins at a 4,4 $prime$ -bipyridyl-modified carbon paste electrode

an oil carbon paste 4,4 $prime$ -bipyridyl chemically modified electrode has been observed to enhance the electrochemical response in cyclic voltammetry of pseudomonas azurin, pseudomonas cytochrome cd//1, horse heart cytochrome c, and ferricyanide. both azurin and ferricyanide adsorb on the surface of the modified electrode. a qualitativ..

studies on the $beta$ -turn of peptides. iv. effect of the chain length on the cd spectra of n-(2,4-dinitrophenyl)-(gly) //n-//d-ala-//l-pro-(gly)//n p-nitroanilides (n $equals$ 1 $minus$ 3)

n-(2,4-dinitrophenyl)-(gly)//n-//d-ala-//l-pro-(gly)//n p-nitroanilides (7b, n $equals$ 2; 7c, n $equals$ 3) were synthesized in order to study the effect of chain length on their conformations. the cd spectra of both 7b and 7c showed similar patterns to that of 7a (n $equals$ 1), but their cotton effects were much weaker. therefore, both..

3d marine seismic survey quality control

in order to solve complex geologic problems, the seismic data must be collected and processed in a comprehensive 3-d sense instead of the 2-d techniques that were previously used. for the purpose of analyzing the prospect area it must be partitioned into 'bins' and those traces which fall within a given bin are treated as positionally coi..

spectrophotometric study of heat-treatment processes in textile fibers

the regularities and physical nature of the changes in absorption coefficient for undyed materials (viscose, cotton, natural silk) were studied in relation to the temperature and time of least treatment in order to establish the scope for practical use in quality evaluation and predicting the effects of elevated temperatures on the fibers..

novel products in the carbonylation of the triply bonded ditungsten hexaisopropoxide dipyridine adduct. part 2: preparation and structure of w//2(o-i w//2(o-i-pr)//6(co)//4, a molecule containing two atoms of the same metallic element with oxidation numb

the structural characterization of one of the products, w//2(o-i-pr)//6(co)//4, is reported. the crystals consist of an ordered array of discrete molecules. it is a binuclear complex with the tungsten atoms in formal oxidation states vi and o and a repulsive interaction between the metal atoms. its crystal structure has been determined, a..

preparation and study of properties of primary low-substituted soluble cellulose acetates

soluble, low-substituted cellulose acetates were prepared by direct acetylation of cellulose in the presence of large quantities of sulphuric acid (100-240) in dioxane. this method of acetylation enables low-substituted cellulose acetates to be obtained in one stage with a degree of substitution of 0 $multiplied by (times)$ 92-2 $multipli..

changes in leachate characteristics during passage through different soil strata

column studies were carried out wherein leachate produced from indian nagpur city refuse was passed through a soil layer to study the extent of removal of pollutants. black cotton soil and yellow soil was used in different runs. 12 refs