Spectrophotometric study of complexation of dibenzopyridino-18-crown-6 with some transition and post-transition metal ions in DMSO solution using murexide as a metallochromic ligand |
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Authors: | J Zolgharnein H Tahmasebi S Amani |
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Institution: | (1) Department of Chemistry, Arak University, Arak, 38156, Iran |
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Abstract: | The complexation reaction of dibenzopyridino-18-crown-6 (DBPY 18C6) with Co2+, Cu2+, Zn2+, Pb2+, Cd2+, Hg2+, and Ag+ have been studied in DMSO at 25°C by the spectrophotometric method. Murexide was used as a competitive colored ligand. The
stoichiometry of metal ion-murexide and metal ions with DBPY18C6 complexes were estimated by mole ratio and continuous variation
methods and emphasized by the KINFIT program. The stoichiometry of all the complexes was found to be 1: 1 (metal ion/ligand).
The order of stability constants for the obtained metal ion-murexide complexes (1: 1) varies in the order Cu2+ > Cd2+ > Co2+ ∼ Pb2+ > Zn2+ > Ag+ > Hg2+. This trend shows that the transition metal ions clearly obey the Irving-Williams role. For the post-transition metal ions,
the ionic radius and soft-hard behavior was the major affects in varying of this order. The dibenzopyridino-18-crown-6 complexes
with the used metal ions vary as Ag+ > Pb2+ > Cu2+ > Cd2+ > Hg2+ > Zn2+ > Co2+.
The article is published in the original. |
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