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|Title:||Synthesis of 1, 10-phenanthroline tetradentate diamines and potentiometric determination of the formation constants of their complexes with manganese(II), cobalt(II), copper(II) and zinc(II)|
|Abstract:||Six tetradentate ligands incorporating 1, 10-phenanthroline and two alkyl amino donors have been prepared. The structure of these ligands has been studied by elemental analysis, IR and 1H NMR. N,N'-diisopropyl - 1, 10-phenanthroline -2,9-dimethanamine has been analyzed by X-ray diffraction. The crystal of C20H28N4. 1. 8(NO3)-0.2(OH)-2(H2O) is monoclinic, space group P2 l/c , (a=7.6 12(2), b=15.182 (3), c=20.551 (4)Å, β=91.16(3)o, z=4, R = 0.060, Rw=0.062). The protonation constants and the formation constant s of complexes with dipositive ion(Mn2+, Co2+,Cu2+ and Zn2+) have been determined in aqueous solution by pH metric method. Steric effects and electron inductive effects on the stability of complexes have been discussed.|
|Appears in Collections:||IJC-A Vol.40A(07) [July 2001]|
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