A cobalamin (Cbl) cofactor in corrinoid iron-sulfur protein (CoFeSP) is the primary methyl group donor and acceptor in biological carbon oxide conversion along the reductive acetyl-CoA pathway. Changes of the axial coordination of the cobalt ion within the corrin macrocycle upon redox transitions in aqua-, methyl-, and cyano-Cbl bound to CoFeSP or in solution were studied using X-ray absorption...

This work proposes a new method for Co(II) determination based on the use of the triblock copolymer as micellar medium instead of chloroform. The proposed strategy is environmental friendly because the copolymer is biodegradable and nontoxic. The method is based on the formation of a cobalt-1-nitroso-2-naphthol complex, in the micellar triblock copolymer compound solution constituted by polyeth...

Highly sensitive, selective, rapid and economical Electroanalytical technique, Differential Pulse Polorography is developed for the determination of cobalt using newly synthesized complexing agent, 4-2-hydroxy phenyl ethaminodiol benzene-1,3-diol (4-2-HPEDB-1,3,D). At pH 5.5 a calibration graph was constructed in the concentration range of 0.1 to 200 g/mL with correlation coefficient 0.9998. T...

B. P. Baranwal*, S. S. Das, Poonam Singh Chemistry Department, University of Gorakhpur, Gorakhpur 273009 India Z. Naturforsch. 52b, 1039-1042 (1997); received July 7, 1997 Cobalt(II) Derivatives, Cyclic Phosphazenes, IR Spectra Chlorine atoms of hexachlorocyclotriphosphazene were substituted with -NH.C2H5, -NH.CH 2C6H5 and -O C 2Hs to yield organotriphosphazene ligands. Anhydrous cobalt(II) chl...