Spin State Chemistry: Modulation of Ligand pKa by Spin State Switching in a [2×2] Iron(II) Grid-Type Complex.

Date publication

juin 2018

Journal

Journal of the American Chemical Society

Auteurs

Membres identifiés du Cancéropôle Est :
Pr LEHN Jean-Marie

Tous les auteurs :
Dhers S, Mondal A, Aguilà D, Ramirez J, Vela S, Dechambenoit P, Rouzieres M, Nitschke JR, Clérac R, Lehn JM

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/29874065

Résumé

The iron(II) [2×2] grid complex Fe-8H has been synthesized and characterized. It undergoes spin-crossover (SCO) upon deprotonation of the hydrazine-based terpyridine-like ligand. The deprotonation patterns have been determined by X-ray crystallography and 1H NMR spectroscopy and discussed in relation to the spin state of the iron(II) centers which influences greatly the pKa of the ligand. The synthesis of the magnetically-silent zinc(II) analogue is also reported and its (de)protonation behavior has been characterized to serve as reference for the study of the Fe(II) grid complexes. DFT computations have also been performed in order to investigate how the successive deprotonation of the bridging ligands affects the SCO behavior within the grid.

Référence

J. Am. Chem. Soc.. 2018 Jun 6;: