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- W2051250647 abstract "Abstract Two dioxotetraza macrocycles 9,12,16,19‐tetraazatricyclo[19.4.0.0 2,7 ]pentacosa‐1(21),2,4,6,22,24‐hexaene‐8,20‐dione( L 1 ) and 9,13,16,20‐tetraazatricyclo[20.4.0.0 2,7 ]hexacosa‐1(22),2,4,6,23,25‐hexaene‐8,21‐dione ( L 2 ) and two bis(dioxotetraaza) macrocycles 7,10,14,17,25,28,32,35‐octaazatetracyclo[17.17.2.0 5,37 .0 23,38 ]octatriaconta‐1,3,5(37),19,21,23(38)‐hexaene‐6,18,24,36‐tetrone ( L 3 ) and 7,11,14,18,26,30,33,37‐octaazatetracyclo[18.18.2.0 5,39 .0 24,40 ]tetraconta‐1,3,5(39),20,22,24(40)‐hexaene‐6,19,25,38‐tetrone ( L 4 ) were prepared. Their protonation constants and the overall complexation constants of their copper(II) complexes were determined by potentiometry at 25 °C ( I = 1, KNO 3 ). In aqueous solution, the complexation sequence was elucidated for each ligand by means of UV/Vis and EPR spectroscopy. According to the ligand structure, two complexation mechanisms can be characterized. For ligand L 1 , a neutral complex [Cu L 1 H –2 ] is readily obtained in one step at pH ≈ 5, and it is the sole species above pH 7. Its structure was confirmed by X‐ray analysis. For ligands L 2 and L 4 , the neutral complexes [Cu L 2 H –2 ] and [Cu 2 L 4 H –4 ] were formed by successive deprotonation of [Cu L 2 ] 2+ and [Cu 2 L 4 ] 4+ , respectively.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
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- W2051250647 date "2009-06-30" @default.
- W2051250647 modified "2023-09-30" @default.
- W2051250647 title "Thermodynamic and Structural Investigations on the Complexation Process of Dioxo Macrocyclic Ligands: Towards Neutral Copper Complexes at Physiological pH" @default.
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- W2051250647 doi "https://doi.org/10.1002/ejic.200900112" @default.
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