FeII Hexa N-Heterocyclic Carbene Complex with a 528 ps Metal-To-Ligand Charge-Transfer Excited-State Lifetime

Pavel Chábera, Kasper S. Kjaer, Om Prakash, Alireza Honarfar, Yizhu Liu, Lisa A. Fredin, Tobias C.B. Harlang, Sven Lidin, Jens Uhlig, Villy Sundström, Reiner Lomoth, Petter Persson, Kenneth Wärnmark

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73 Citeringar (SciVal)

Sammanfattning

The iron carbene complex [FeII(btz)3](PF6)2 (where btz = 3,3′-dimethyl-1,1′-bis(p-Tolyl)-4,4′-bis(1,2,3-Triazol-5-ylidene)) has been synthesized, isolated, and characterized as a low-spin ferrous complex. It exhibits strong metal-To-ligand charge transfer (MLCT) absorption bands throughout the visible spectrum, and excitation of these bands gives rise to a 3MLCT state with a 528 ps excited-state lifetime in CH3CN solution that is more than one order of magnitude longer compared with the MLCT lifetime of any previously reported FeII complex. The low potential of the [Fe(btz)3]3+/[Fe(btz)3]2+ redox couple makes the 3MLCT state of [FeII(btz)3]2+ a potent photoreductant that can be generated by light absorption throughout the visible spectrum. Taken together with our recent results on the [FeIII(btz)3]3+ form of this complex, these results show that the FeII and FeIII oxidation states of the same Fe(btz)3 complex feature long-lived MLCT and LMCT states, respectively, demonstrating the versatility of iron N-heterocyclic carbene complexes as promising light-harvesters for a broad range of oxidizing and reducing conditions.

Originalspråkengelska
Sidor (från-till)459-463
Antal sidor5
TidskriftJournal of Physical Chemistry Letters
Volym9
Utgåva3
DOI
StatusPublished - 2018 feb 1

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