Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/18319
Title: Stability studies on 12-(5'-8'-hydroxyquinolinic)methylene-1,4,7,10- tetraazacyclo tridecane-11,13-dione, 5- substituted 1,10-phenanthroline-copper(II) with Cu2+ or Co2+ binuclear mixed coordinated systems
Authors: Zhao, Xiaojun
Su, Xuncheng
Yang, Encui
Lin, Huakuan
Zhu, Shourong
Sun, Hongwei
Chen, Yunti
Issue Date: Jul-2002
Publisher: NISCAIR-CSIR, India
Abstract: C-functionalized dioxotetraamine ligands L have been designed and synthesized through simple methods, and characterized by elemental analysis, IR, mass spectra and 1H NMR. The ligand contains two independent chelating groups. At 25.0±0.1oC, I=0.1 mol·dm-3 NaNO3, pH titration has been performed to study the stability properties of L-5-R-5,10-phenanthroline-Cu(II) with proton, copper(II) and cobalt(II). The ternary complexes have been shown to possess interesting properties due to the involvement of three chelating groups, 5-substituted- 1, 10-phenanthroline, 8- hydroxyquinoline and dioxotetraamine. In addition, potentiometric titrations have been performed to study the protonation of L-5-R- 1, 10-phenanthroline-Cu(II) (R=CH3,H,Cl,NO2) and their stability properties with copper(II) and cobalt(II). The results show that for Cu2+ and Co2+, 8-hydroxyquinoline is a strong chelating reagent than dioxytetraamine macrocycles. Using molecular mechanics (MM+) calculation, the stability of ternary mixed system on Co(II)L- S-substituted- 1, 10-phenanthroline-Cu(II) and Cu(II)-L-Ssubstituted-1, 10-phenanthroline-Cu(II) have been studied and compared with the coordination ability for different coordination sites and for different metal ions (Co(II) and Cu(II) at the same coordination site. The results obtained from calculation agree with the experimental results.
Page(s): 1428-1432
URI: http://hdl.handle.net/123456789/18319
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.41A(07) [July 2002]

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