Tetren, Tetraethylenepentamine

C7H704Rh, Rhodium(I), dicarbonyl(2,4-pentanedionato)-, 34 128 C7HgN4, Bis(l-pyrazolyl)methane, bpm, complex with nickel(ll), 34 139 CgH5FeKN20, Ferrate(ll), carbonyldicyano-(cyclopentadienyl)-, potassium, 34 172 CgH23Ns, Tetraethylenepentamine, tetren, complex with nickel(ll), 34 147, 148 CgH24B2N4, Diborane(4), tetrakis(dimethyl-amino)-, 34 1... 

Ethylenediamine (en), diethylenetriamine (dien), triethylene-tetramine (trien), and tetraethylenepentamine (tetren) form well characterized complexes with M(ii) ions. Such complexes have been the subjects of a number of NMR exchange studies. (299-303) studies have established the identities of [Cu(en)(H20)4], [Cu(en)2-(HjOjj], and complexes involving both en and sulphosalicylic acid ligands. (299-301) NMR studies have been made on aqueous solutions of [Ni(dien)(H20)3], [Ni(tren)(H20)2], and... 

To a solution of tetraethylenepentamine pentahydrochloride (tetren 5HC1, Aldrich) (2.24 g 6.0 mmol) dissolved in 20 mL of water is added 1.21 g of sodium hydroxide (30 mmol, 5 equiv). A solution of nickel(II) chloride hexa-hydrate in 10 mL of water (0.95 g, 4.0 mmol) is then slowly added. The mixture is stirred for 20 min before adding dropwise a solution of potassium hexacyano-chromate(lll) (0.325 g, 1 mmol) in a minimum of water. The solution is left... 

The skeleton types for linear and branched chain Nj polyamine ligands are shown in (87)-(90). Commerically available technical tetraethylenepentamine is a mixture of linear tetren, branched chain trenen and other unidentified materials. Thus it is not surprising, in hindsight, that five-coordinate Cu" complexes of trenen and octahedral Co " complexes of tetren (e.g. CoCKtetren) " ) have been isolated from the technical polyamine. Both Fe " and Cr" also give complexes with the linear tetren, rather than the branched chain isomer. 

---