Authors
Wiebke G Rehfuß, Andreas Kalytta-Mewes, Maryana Kraft, Binh Minh Nguyen, Wolfgang Brütting, Dirk Volkmer
Published in
Dalton transactions (Cambridge, England : 2003). Apr 02, 2025. Epub Apr 02, 2025.
Abstract
We present the synthesis and comprehensive characterization of a series of complexes belonging to the Kuratowski (K3,3) family. These are pentanuclear {RuIIM4} complexes (M = Co2+, Ni2+, Zn2+) which were prepared by employing a directed two-step synthesis facilitated by the recently published [RuII(Me2bta)2(Me2btaH)4] precursor complex (Me2btaH = 5,6-dimethyl-1,2,3-benzotriazole). The pentanuclear Kuratowski complexes showcase a unique combination of photo-active ruthenium with redox-active metal centres. The μ3-bridging 1,2,3-triazolate ligands in these complexes facilitate electronic coupling between the metal centers, as revealed through electrochemical and photophysical studies. Comparisons with {RuIIZn4} and {RuIICu4} Kuratowski compounds reveal that Co(II) significantly influences both the Ru(II/III) redox step and the position of the MLCT (metal-to-ligand charge transfer) band, whereas Cu(II) and Ni(II) exhibit minimal influence. Photophysical investigations reveal the {RuIIZn4} compound as the only phosphorescent species, displaying an emission band extending into the near-infrared region. This emission originates from a triplet 3MLCT state and features an exceptionally large Stokes shift, with a long lifetime of the excited-state of about 3.3 μs in powdered form at room temperature.
PMID:
40171708
Bibliographic data and abstract were imported from PubMed on 02 Apr 2025.
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