Evidence of protonation induced intra-molecular metal-to-metal charge transfer in a highly symmetric cyanido bridged {FeNi} molecular square.

The possibility to induce intra-molecular metal-to-metal charge transfer in a cyanido bridged tetranuclear square shaped {FeNi} complex by employing protonation as an external stimulant is explored. Two cyanido bridged square shaped tetranuclear complexes, [{Ni(TPA)(μ-NC)Ni(CN)}]·4HO (2) and [{Ni(TPA)(μ-NC)Fe(bbp)(CN)}]·10HO (3) [TPA = tris(3,5-dimethylpyrazol-1-ylmethyl)amine and Hbbp = bis(2-benzimidazolyl)pyridine], are synthesized and characterized. Low temperature magnetic measurements reveal that complex 3 has dominant ferromagnetic interactions between low-spin Fe (S = 1/2) and high-spin Ni (S = 1) ions. UV-visible spectrophotometric measurements and electrochemical studies establish that reversible intra-molecular metal-to-metal electron transfer can be triggered in 3 upon the addition of either an acid or a base.