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Withdrawn Paper: Molecules 2001, 6, 647-654 [1]
Molecules 2003, 8(7), 521-535; doi:10.3390/80700521
Article

Synthesis and Characterization of Acyclic and Cyclic Azabridged Ligands Incorporating 2,2'-Bipyridine Subunits and Their Complexes With Copper(II), Cobalt(II), and Nickel(II)

*  and
Department of Physical and Chemical Methodologies for Engineering, Engineering Faculty, University of Catania, V.le Andrea Doria 6, I-95125 Catania, Italy
* Author to whom correspondence should be addressed.
Received: 12 December 2002 / Revised: 14 June 2003 / Accepted: 16 June 2003 / Published: 15 July 2003
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Abstract

The synthesis of a series of N,N'-disubstituted acyclic (AL) and cyclic (CL) aza-bridged ligands incorporating 2,2-pipryidine subunits is described. 1H-NMR and IR spectral data support the proposed ligand structures. Dynamic 1H-NMR studies on diurea and diamide derivatives point to the presence of slowly interconverting conformers on the 1H-NMR time-scale, owing to N−H···N hydrogen bonding and/or a restricted rotation around the amide bonds. The ligands synthesized form 1:1 complexes with divalent transition metal ions. Upon complexation, bis-ester derivatives AL5 and CL5 undergo a metal-induced hydrolysis of the ester groups to carboxyl functions, which act as additional binding sites for the metal ion, as well as hydrogen-bonding donor-acceptor binding site to produce dimeric complexes.
Keywords: Transition metal complexes; bipyridine derivatives; polydentate aza-ligands; macrocycles; dynamic NMR Transition metal complexes; bipyridine derivatives; polydentate aza-ligands; macrocycles; dynamic NMR
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Mamo, A.; Pappalardo, A. Synthesis and Characterization of Acyclic and Cyclic Azabridged Ligands Incorporating 2,2'-Bipyridine Subunits and Their Complexes With Copper(II), Cobalt(II), and Nickel(II). Molecules 2003, 8, 521-535.

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