Hexamethylenetetramine metal complexes

Hemocyanin, deoxy-copper complexes, 592 Heterocyclic compounds synthesis, 1121 Hexamethylenetetramine metal complexes, 937 Histidine... 

N-Donor Ligands. CrOa forms a 1 1 complex with hexamethylenetetramine, the i.r. and electronic spectra of which indicate that the metal has a pseudo-tetrahedral (C3J environment. ... 

The pH of coloured solutions is often stabilized by means of suitable buffers. Tartrate, citrate, phosphate and phthalate solutions are usually avoided since they can bind many metals in stable complexes. Acetate solutions are often used, although they also can form complexes with some metals ie.g., Al, Be). Acetate buffers may be replaced by hexamethylenetetramine buffers. 

One amine that has potentially four coordination sites is hexamethylenetetramine. In most complexes, however, this acts as a terminally bonded monodentate ligand (Mn", Cd", Ni", Co" ) or a bidentate ligand bridging between two metal atoms (Cu", Zn", Cd"). ... 

Bimetallic Co(Ni)-Mo carbides can also be synthesized due to the decomposition of precursors (metal-hexamethylenetetramine complexes) in an inert atmosphere [9, 10], This is a simple one-stage method of the formation of double C03M03C and CogMogC carbides [11], In [12], the Co Moi j oxides prepared from aqueous solutions of cobalt nitrate and ammonium heptamolybdate were carbonized in a flow of pure methane and hydrogen (20% CH4/H2 mixture) to form double carbides. 

Chouzier, S., Afanasiev, R, Vrinat, M. et al. (2006) One step synthesis of dispersed bimetallic carbides and nitrides from transition metals hexamethylenetetramine complexes. 7. Solid State Chem., 179 (11), 3314-3323. 

Addition Compounds with Iiior cnzc Balts. Hexamethylenetetranjine forms addition compounds with a wide variety of inorganic salts including salts of alkali metals, alkaline earths, rare eaiths and metals. Although many of these compounds tend to conform to the type formula, M X - nCs-H12IIC4, in Avhich At stands for a metal ion of valence n, the number of molecules of combined hexamethylenetetramine per mol of salt is often lower than this value and several different complexes are often formed with the same salt. 

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