Cobalt tetramines

Co has been used for the labeling of bovine serum albumin. As a result of labeling, a complex consisting of a peptide bond, cobalt and ethylene diamine or triethylene-tetramine is formed... 

A detailed investigation of configurational isomers has been carried out with a view to the development of a peptide sequencing process. " Quite good developments towards a practical sequencing process have been made using simple peptide cobalt(III) complexes of triethylene-tetramine and tris(2-aminoethyl)amine (Scheme The critical A-terminal complexes can... 

The tripodal compounds 6, 7, 8 and 9 are known to coordinate to lanthanides as well as anions however, it would be interesting to see if they coordinate to transition metals too. There are examples of trigonal bipyramidal cobalt complexes in which one apical and three equatorial coordination sites are provided by a tripodal tetramine ligand with the other apical position being occupied by a counterion. Indeed, when a solution of compound 9 in chloroform is shaken with... 

Reactions of cobalt complexes of macrocyclic tetramine ligands with various couples (including the highly oxidizing MnCl /, hitherto little studied) have been reported. Inner-sphere and outer-sphere reactions involving, for example, [Ru(NH3)6py] +/ + have been characterized. A free-energy correlation for reactions between [Co(N4)(OH2)2] with inner-sphere oxidants shows the expected slope 9AG /3AG 0.5 down to a limit of AG a 7 kcal mol, which is believed to represent diffusion control. Application of the Marcus equations (1) and (3) to reactions of both types leads to an assessment of the factors con-... 

This compound also uses Neoprene W type polychloroprene rubber. The compound, though coloured black with a few parts of carbon black is mainly filled with silica, which is a reinforcing mineral filler. The silica also helps to bond the rubber to the steel cords other ingredients added for this purpose include cobalt naphthenate. A commonly used system for this purpose is one comprising resorcinol and hexamethylene tetramine (HMT) which acts as a formaldehyde donor to form a phenolic resin in situ, but this is not suitable for Neoprene compounds because resorcinol is a fast accelerator for Neoprene vulcanization and interferes with its processing safety. 

Many rubber composites require that the rubber adheres permanently to a substrate such as steel, brass, textiles or other media. There are a number of established proprietary additives, which may be added to the rubber compound, which function in this capacity. The resorcinol-formaldehyde-silica (RFS) system is commonly used to achieve adhesion to metals. This system relies on the interaction of resorcinol (or a resorcinol donor), a methylene donor snch as hexamethylene tetramine and precipitated silica. Other systems that may rely on cobalt complexes or blocked isocyanates may also be used. 

Eishin Kyuno, L. J. Boucher and J. C. Bailar, Jr., Stereochemistry of Complex Inorganic Compounds. XXIX. The Base Hydrolysis of the Optically Active a-Dichlorotriethylene-tetramine Cobalt(III) Cation, J. Am. Chem. Soc. 87 4458 (1965). 

Resin systems have been employed extensively for many years in applications such as the bonding of textiles to rubber, in hoses and belts where they have been used as tackifiers, reinforcers, curing agents and adhesion promoters. The addition of resin and/or cobalt depends upon the application and performance requirements of the rubber article that is to be bonded. Traditionally, resorcinol in combination with a methylene donor such as hexamethylene tetramine (HMT Figure 7.6) was utilised either alone or in compounds containing cobalt salts. On heating, HMT decomposes to produce ammonia and formaldehyde that reacts with the resorcinol to produce a stable, highly crosslinked polymeric network. 

The surfactant-cobalt(III) complex, dx-[Co(trien)(4CNP)(DA)](C10 )j (trien= triethylene tetramine, 4CNP = 4-cyanopyridine, and DA = dodecylamine), was synthesized (Fig. 4.13) and characterized by various spectroscopic and physicochemical techniques. The complex was tested in vitro on human hepatocellnlar liver carcinoma tumor cell lines and found to be active [84]. 

Other studies have dealt with the aquation rates of some diacido cobalt(III) tetramine complexes containing asymmetric tetramine ligands, activation parameters for the aquation of frans-[Co(pn)2Cl2] , polyelectrolyte catalysis in the aquation of [Co(ox)3] in binary mixtures... 

Bhattachajjee A, Weiss AKH, Artero V, Field MI, Hofer TS (2014) Electronic stnicture and hydration of tetramine cobalt hydride eomplexes. J Phys Chem B 118 5551... 

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