TRIEN Triethylenetetramine

Abbreviations py = pyridine en = ethylenediamine Mejen = l r,i f-dimethyl-ethylenediamine EtenEt = JV,JV -diethylethylenediamine bipy = 2,2 -bipyridine Et4dien = JVfJV,JV, Ar,-tetraethyldiethylenetriamine 4,7-diphenylphen - 4,7-di-phenyl-l,10-phenanthroline tripyam = tri(2-pyridyl)amine (bidentate) dppa = phenyldi(2-pyridyl)amine trien — triethylenetetramine. 

The kinetics of chloride exchange in /ra ,s-[Ir(Cl)2 (trien)]+238 (trien = triethylenetetramine) show behaviour similar to that of cis- and tran5-[Ir(Cl)2(en)2]+.239 Also, the rate constant dependency on chloride concentration is similar for all three complexes. This dependency has been interpreted238 either in terms of an ion pair or a dissociative mechanism, with the latter being more favourable. 

The base hydrolysis stereochemistry for D -a-cis- and L -j8-ds-[Co(trien)Cl2] and the corresponding chlorohydroxo ions, where trien = triethylenetetramine, have been investigated by Kyuno and Boucher in collaboration with Bailar. Whereas, the p isomers undergo base hydrolysis with complete retention of configuration, the a isomers show inversion during base hydrolysis. Furthermore, the products of the a isomer reactions were shown to be exclusively D -a-cis and L -)S-cis isomers. The rotations of the pure D -a-[Co(trien)(OH)2] ion ([a]o = +1950°), the pure l -) -[Co(trien)(OH)2] ion ([ajo = —700°), the reaction... 

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