Observation of protonation induced spin state switching in a cyanido bridged {Fe2Co2} molecular square
Résumé
The self-assembly of [Co(MeTPyA)(CH3COO)]PF6 (1) and [Fe(bbp)(CN)3]2- affords a cyanido bridged square shaped {Fe2Co2} tetranuclear complex, [{Co(MeTPyA)(μ2-NC)2Fe(bbp)(CN)}2]∙3H2O (2) [MeTPyA = tris(3,5-dimethylpyrazol-1-ylmethyl)amine and H2bbp = bis(2-benzimidazolyl)pyridine]. The possibility to induce intramolecular electron transfer coupled spin transition in 2 by employing protonation as external stimulants is explored. UV-visible spectrophotometric measurements, electrochemical and 1H NMR studies establish that reversible intramolecular electron transfer coupled spin transition can be triggered in 2 upon addition of either acid or base.
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