Next Article in Journal
Previous Article in Journal
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
Received: 12 December 2002; in revised form: 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.

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.

AMA 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(7):521-535.

Chicago/Turabian Style

Mamo, Antonino; Pappalardo, Andrea. 2003. "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 8, no. 7: 521-535.



Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert