Triamines complex formation

Other polydentate ligands are polyamines and related ligands. Stability constants of silver(I) complexes with polyamines in dimethyl sulfoxide,419 A-methyl-substituted 4-methyldiethylene-triamines,420 or ethylene- or N- or C-methylated ethylenediamine in aqueous solution have been reported.421 The structure of the silver 1,3-diaminopropane complex, [Ag NH2(CH2)3NH2 ]-C104,422 and complex formation with 1,4-diaminobutane and 1,5-diaminopentane have been reported.423 A dinuclear silver(I) compound with ethylenediamine [(enH)Ag(en)Ag(enH)2]4+ has... 

Reactions of the triamine complexes such as [cis-Pt(NHa)2(4-mepy)Cl]Cl with d(GpG) proved that there is no release of amine ligands and therefore the formation of bifunctional adducts, comparable to those induced by cis-Pt, is highly unlikely (71, 72). Only two mononu-... 

Zn complexes with the cyclic triamines (6) have also been investigated.216 Formation of the 1 1 complex occurs in a single step, but with some of the larger ligands loss of a proton occurs before any noticeable metal-ligand interaction occurs. Some hydrolysis of the [ZnL]2+ complexes is observed the stability increases as the ring size decreases, in agreement with predictions from molecular models. 

Pyridine-2,6-dicarbaldehyde and 2,6-diacetylpyridine have been widely used in the template synthesis of imine chelates ranging in complexity from linear tridentates, such as (17),38 39 to macrocyclic structures with a range of ring sizes, such as (18).40-42 The in situ formation of macrocyclic ligands of this type depends upon the ring size and the strength of complexation of the triamine by the metal ion at the pH of the reaction. Related complexes with an additional donor atom attached to R2 have been synthesized also.43 44... 

The formation of salts with melamine (1.3,5-triazine-2,4,6-triamine) is the most extensively studied reaction of this type. In most cases, melamine acts as a monoacidic base and forms salts with mineral acids, e.g. hydrochloric acid, nitric acid or sulfuric acid, inorganic complexes, e.g. hydrogen tetrachloroaurate(III) or dihydrogen hexachloroplatinate(IV) and a large variety of organic acids, e.g. acetic acid, oxalic acid, picric acid or some sulfonic acids.30... 

A relatively hydrophobic chelating agent, namely, 4-dodecy-diethylene triamine, has been employed in the presence of Zn (II) ions to achieve the reversed-phase separations of dansyl amino acids, dipeptides, and aromatic carboxylic acids. The metal-derived selectivity results from the formation of outer sphere complexes. The formation of these complexes is rapid, contributing to the high separation efficiencies observed. 

Therefore, the investigation of the effect of cyclic triamine TMT on the MMA polymerization and properties of the polymer obtained is interesting. The stmcture of this compound is shown by scheme 1. In the stmcture the lutrogen atoms and the geminal methylene groups are These groups and atoms are most active in formation of redox iiutiating systems (ROX) for complex-radical polymerization. 

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