93733-12-1Relevant academic research and scientific papers
A two-in-one pincer ligand and its diiron(II) complex showing spin state switching in solution through reversible ligand exchange
Samanta, Subhas,Demesko, Serhiy,Dechert, Sebastian,Meyer, Franc
supporting information, p. 583 - 587 (2015/03/04)
A novel pyrazolate-bridged ligand providing two {PNN} pincer-type compartments has been synthesized. Its diiron(II) complex LFe2(OTf)3(CH3CN) (1; Tf=triflate) features, in solid state, two bridging triflate ligands, with a terminal triflate and a MeCN ligand completing the octahedral coordination spheres of the two high-spin metalions. In MeCN solution, 1 is shown to undergo a sequential, reversible, and complete spin transition to the low-spin state upon cooling. Detailed UV/Vis and 19F NMR spectroscopic studies as well as magnetic measurements have unraveled that spin state switching correlates with a rapid multistep triflate/MeCN ligand exchange equilibrium. The spin transition temperature can be continuously tuned by varying the triflate concentration in solution.
