Am ononuclear Fe II complex, prepared with aB rønsted diacid ligand, H 2 L( H 2 L = 2-[5-phenyl-1H-pyrazole-3-yl] 6-benzimidazole pyridine), shows switchable physical properties and was isolated in five different electronic states.T he spin crossover (SCO) complex, [Fe II (H 2 L) 2 ](BF 4 ) 2 (1 A ), exhibits abrupt spin transition at T 1/2 = 258 K, and treatment with base yields ad eprotonated analogue [Fe II -(HL) 2 ](1 B ), which shows gradual SCO above 350 K. Arange of Fe III analogues were also characterized.[ Fe III (HL)(H 2 L)]-(BF 4 )Cl (1 C )h as an S = 5/2 spin state,w hile the deprotonated complexes [Fe III (L)(HL)],( 1 D ), and (TEA)[Fe III (L) 2 ], (1 E ) exist in the low-spin S = 1/2 state.T he electronic properties of the five complexes were fully characterized and we demonstrate in situ switching between multiple states in both solution and the solid-state.T he versatility of this simple mononuclear system illustrates howproton donor/acceptor ligands can vastly increase the range of accessible states in switchable molecular devices.
A mononuclear FeII complex, prepared with a Brønsted diacid ligand, H2L (H2L=2‐[5‐phenyl‐1H‐pyrazole‐3‐yl] 6‐benzimidazole pyridine), shows switchable physical properties and was isolated in five different electronic states. The spin crossover (SCO) complex, [FeII(H2L)2](BF4)2 (1A), exhibits abrupt spin transition at T1/2=258 K, and treatment with base yields a deprotonated analogue [FeII(HL)2] (1B), which shows gradual SCO above 350 K. A range of FeIII analogues were also characterized. [FeIII(HL)(H2L)](BF4)Cl (1C) has an S=5/2 spin state, while the deprotonated complexes [FeIII(L)(HL)], (1D), and (TEA)[FeIII(L)2], (1E) exist in the low‐spin S=1/2 state. The electronic properties of the five complexes were fully characterized and we demonstrate in situ switching between multiple states in both solution and the solid‐state. The versatility of this simple mononuclear system illustrates how proton donor/acceptor ligands can vastly increase the range of accessible states in switchable molecular devices.
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