New iron(II) spin-crossover complexes with heterocyclic amine-derived ligands and STEPS experiments on photogenerated metastable high-spin states

Proton Control of Oxidation and Spin State in a Series of Iron Tripodal Imidazole Complexes

“…The potential of Fe(phen) 3 2+ under these same conditions was measured at 763 mV, which compares favorably to a literature report using the same reference electrode. 40 The redox processes are reversible one-electron changes based on the difference between E p cathodic and E p anodic of 60 mV. The general stabilization of the iron(II) complexes with the imidazole ligands and the stabilization of the iron(III) forms with the fully deprotonated ligands is pronounced.…”

Modulation of iron reduction potential by deprotonation at a remote site

“…[1][2][3] The dark red complex † showed a strong MLCT band in methanol at 520 nm (e = 5900 l mol 21 cm 21 ). Upon treatment with Bu t OK in methanol under nitrogen the solution became dark purple and showed the red shift and increase in intensity previously observed 1 2 Since iron(ii) coordinated to unsaturated nitrogen heterocyclic ligands is generally very hard to oxidise, the observation of spontaneous oxidation by air was surprising, especially since [Fe (2) Deprotonation of coordinated imidazole at the pyrrolic hydrogen has been reported on many occasions 5 and often results in the imidazolate acting as a bridging ligand with formation of binuclear species. 6 For 1 2 2H this is impossible as a result of steric hindrance from the pyridyl moiety, but the basic nature of the deprotonated nitrogens is shown by the strong hydrogen bonds formed between N3 and N5 and the water molecules bound to sodium in [Fe(1 2 2H) 2 ][Na- 8.67(7), 9.86(10) and 9.92 (9).…”

Synthesis and Characterisation of Palladium(II) Complexes with 1,2-bis(N-methylbenzimidazolyl)Benzene

“…10,[19][20] PdCl 2 was procured from Arora-Matthey Ltd. and 1,5-cyclooctadiene was obtained from Merck. and [PdX(cotl)] 2 (X = Cl or Br) were prepared as described earlier.…”