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The syntheses of two new, potentially hexadentate ligands with an N 3 O 3  donor set is reported: 1,4,7-triazacyclononane-N,N′,N″-tris-2-ethanesulfonate (TES) and 1,4,7-triazacyclononane- N,N′,N″-tris-ethylacetate (TEA). Complexes of the divalent transition metals Co(II), Ni(II), Cu(II) containing these ligands have been prepared. The kinetics of the reactions of [Con(TEA)H 2 O] 2+  and [Co II (TCTA)]-(TCTA= 1,4,7-triazacyclononane- N,N′N″-tris-acetate) with [Fe III (CN) 6 ] 3- , respectively, have been measured. A stable binuclear [Co(TEA)(CN) 6 Fe] -  species has been characterized in solution whereas the reaction of [Co(TCTA)]- with [Fe(CN) 6 ] 3-  yields [Co III TCTA] and [Fe(CN) 6 ] 4-  via an outer-sphere electron transfer reaction (k = 5,9 × 10 3  1 mol -1  sec -1 ; 25 °C, I = 0,26 M). Na[Ni(TES)H 2 O]·5H 2 O crystallizes in the triclinic space group P1̄ (C i  1 -No 2) with cell constants a = 806,7(4), b = 1468,4(8), c = 2317,9(8) pm, α = 72,36(4)°, β = 83,48 (3)°, γ = 81,99(4)°, and Z = 4. The nickel(II) center is in a distorted octahedral environment of a pentadentate TES ligand (N 3 O 2 ) and a coordinated H 2 O. Na[Cu(TES)] 3H 2 O crystallizes in the triclinic space group P1̄ (C i  1 -No 2) with cell constants a = 747,3(3), b - 1082,6(5), c = 1459,3(9) pm, α = 81,13(5)°, β = 84,75(4)°, γ = 79,39(3)°, and Z = 2. The copper(II) center is in a distorted quadratic pyramidal environment of a pentadentate TES ligand. Each of the complex anions contains one uncomplexed CH 2 -CH 2 -SO 3 -group.

zeitschrift für naturforschung b

Metallkomplexe der Liganden 1.4.7-Triazacyclononan-N.N′.N″ -tris-2-ethansulfonat (TES) und 1.4.7-Triazacyclononan-N.N′.N″ -trisethylacetat (TEA). Die Kristallstrukturen von Na[Ni(TES)(H 2 O)]·5H 2 O und Na[Cu(TES)]·3H 2 O / Transition Metal Complexes Containing the Ligands 1,4,7-Triazacyclononane-N,N′,N″-tris-2-ethanesulfonate (TES) and 1,4,7-Triazacyclononane-N,N′,N″-tris-ethylacetate (TEA). The Crystal Structures of Na[Ni(TES) (H 2 O)]·5H 2 O and of Na[Cu(TES)]·3H 2 O