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Title: Synthesis and characterization of novel N-functionalized macrocyclic dioxotetraamines bearing 8-hydroxyquinoline and its metal complexes: Stability in aqueous solutions
Authors: Zhao, Xiaojun
Su, Xuncheng
Yang, Encui
Wang, Ying
Lin, Huakuan
Zhu, Shourang
Sun, Hongwei
Issue Date: Apr-2004
Publisher: NISCAIR-CSIR, India
Abstract: Novel 4-(5'-8'-hydroxyquinoline)methylene-1,4,7, 10-tetraazacyclotridecane- 11,13-dione ligand (L) has been synthesized by simple method, and characterized by elemental analyses, IR and 1H NMR. It has two chelating sites each able to react with a transition metal ion to form complexes. At 25.0 0.1oC, I = 0.1 mol/dm3 NaNO3, potentiometric titrations have been performed to determine the protonation of L-5-R-1, 10-phenanthroline-Cu(II) (R = CH3, H, Cl, NO2) and the stability constants of Cu(II) and Co(II). The results show that for Cu(II) and Co(II) complexes, 8- hydroxyquinoline is a stronger chelating reagent than tetraamine[13]ene macrocycles. Molecular mechanics (MM+) calculations have been performed to assess the stability of ternary mixed system on CO(II)- L-5-substituted-10, 10-phenanthrolineCu(II) and CU(II)-L-5-substituted-1,10-phenanthro line-Cu(II). The coordination ability for different coordination sites and for different metal ions (Co(II) and Cu(II) at the same sites have been compared. The calculated results agree with those obtained experimentally.
Page(s): 793-798
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(04) [April 2004]

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