Bis[1,1'-N,N'-(2-picolyl)aminomethyl]ferrocene as a redox sensor for transition metal ions

Dalton Transactions : an International Journal of Inorganic Chemistry
Xiuling CuiVitor Félix

Abstract

The compound bis[1,1'-N,N'-(2-picolyl)aminomethyl]ferrocene, L(1), was synthesized. The protonation constants of this ligand and the stability constants of its complexes with Ni(2+), Cu(2+), Zn(2+), Cd(2+) and Pb(2+) were determined in aqueous solution by potentiometric methods at 25 degrees C and at ionic strength 0.10 mol dm(-3) in KNO(3). The compound L(1) forms only 1:1 (M:L) complexes with Pb(2+) and Cd(2+) while with Ni(2+) and Cu(2+) species of 2 [ratio] 1 ratio were also found. The complexing behaviour of L(1) is regulated by the constraint imposed by the ferrocene in its backbone, leading to lower values of stability constants for complexes of the divalent first row transition metals when compared with related ligands. However, the differences in stability are smaller for the larger metal ions. The structure of the copper complex with L(1) was determined by single-crystal X-ray diffraction and shows that a species of 2:2 ratio is formed. The two copper centres display distorted octahedral geometries and are linked through the two L(1) bridges at a long distance of 8.781(10) Angstrom. The electrochemical behaviour of L(1) was studied in the presence of Ni(2+), Cu(2+), Zn(2+), Cd(2+) and Pb(2+), showing that upon complex...Continue Reading

References

Oct 24, 2001·Inorganic Chemistry·Mihai BudaRaymond Ziessel
May 31, 2002·Acta Crystallographica. Section B, Structural Science·Frank H Allen
May 31, 2002·Acta Crystallographica. Section B, Structural Science·Ian J BrunoRobin Taylor
Feb 16, 1998·Angewandte Chemie·Pierre L BoulasLuis Echegoyen

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Citations

Sep 6, 2013·Inorganic Chemistry·María AlfonsoPedro Molina
Oct 10, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Michael SchmittelHorst Ammon
Apr 28, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Javier E AguadoM Dolores Villacampa
Jul 26, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Francisco OtónPedro Molina

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