2,5-Diphenyl-3,4-bis(2-pyridyl)cyclopenta-2,4-dien-1-one as a redox-active chelating ligand.
2,5-Diphenyl-3,4-bis(2-pyridyl)cyclopenta-2,4-dien-1-one (1), a close relative of tetraphenylcyclopentadienone, is a new ligand platform for use in redox switches and sensors. Compound 1 acts as a molecular electrochemical sensor towards a range of divalent metal ions and exhibits favourable two-wave behaviour. It forms chelates of the type [(1)MX2], whose stability is enhanced by five orders of magnitude upon one-electron reduction. The bite angle of 1 is close to 90 degrees in these complexes. The attachment of the 14-valence-electron Cp*Co fragment to the cyclopentadienone pi system reduces the bite angle and thus modulates the binding characteristics of 1.
Science Department and Center for Interdisciplinary, Nanostructure Science and Technology (CINSaT), University of Kassel, 34109 Kassel, Germany. siemeling@uni-kassel.de
Ulrich
U
Siemeling
Imke
I
Scheppelmann
Jürgen
J
Heinze
Beate
B
Neumann
Anja
A
Stammler
Hans-Georg
HG
Stammler