Next Article in Journal
Synthesis and Reactivity of New 1-Pentafluorophenyl-1Hpyrrole Derivatives
Previous Article in Journal
Withdrawn Paper: Molecules 2001, 6, 647-654 [1]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
Download PDF [131 KB, uploaded 18 June 2014]

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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

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.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here

Comments

Cited By

[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert