NDLI: Equilibrium studies between some transition metal ions and Me6[14]dieneN4 ligand

Content Provider	Springer Nature Link
Author	Jelić, Ratomir Selimović, Enisa Nikolić, Radivoje Bugarčić, Živadin D. Bogojeski, Jovana
Copyright Year	2012
Abstract	The complex formation equilibria between Me6[14]dieneN4 (5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) and metal ions such as Cu2+, Ni2+, and Zn2+ in aqueous 0.1 M NaCl at 298 K were studied by glass electrode potentiometric titrations. The formation constants of the complexes were determined by titration of mixtures of metal ion (2.0 mM) and ligand in concentration ratios of 1:1 and 1:2 (metal/ligand). The stability constants for the species of the general formula M p H q L r (M = Cu2+, Ni2+, and Zn2+ ion, L = Me6[14]dieneN4) were calculated using a computational program, taking into account the hydrolysis of metal ions and protonation of the ligand. The stoichiometry and stability constants of the formed complexes are reported, and the concentration distribution of the various complex species was evaluated as a function of pH. All the above metals form mononuclear ([ML] and/or [MHL], [MH2L]) and hydroxo complexes. The selectivity of the ligand toward metal ions is Cu2+ > Ni2+ > Zn2+. Analysis of the calculated pM values also shows that the Cu2+ ion has higher affinity for the Me6[14]dieneN4 ligand than Ni2+ and Zn2+ ions do.
Starting Page	1357
Ending Page	1363
Page Count	7
File Format	PDF
ISSN	00269247
Journal	Monatshefte für Chemie - Chemical Monthly
Volume Number	143
Issue Number	10
e-ISSN	14344475
Language	English
Publisher	Springer Vienna
Publisher Date	2012-06-22
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metal complexes Acidity Complex formation constant Stoichiometry Macrocycles Theoretical and Computational Chemistry Inorganic Chemistry Organic Chemistry Analytical Chemistry Physical Chemistry Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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