We have located links that may give you full text access.
Guanidinate Yttrium Complexes Containing Bipyridyl and Bis(benzimidazolyl) Radicals.
Inorganic Chemistry 2024 April 4
Ancillary ligand scaffolds that sufficiently stabilize a metal ion to allow its coordination to an open-shell ligand are scarce, yet their development is essential for next-generation spin-based materials with topical applications in quantum information science. To this end, a synthetic challenge must be met: devising molecules that enable the binding of a redox-active ligand through facile displacement and clean removal of a weakly coordinating anion. Here, we probe the accessibility of unprecedented radical-containing rare-earth guanidinate complexes by combining our recently discovered yttrium tetraphenylborate complex [{(Me3 Si)2 NC(Ni Pr)2 }2 Y][(μ-η6 -Ph)(BPh3 )] with the redox-active ligands 2,2'-bipyridine (bpy) and 2,2'-bis(benzimidazole) (Bbim), respectively, under reductive conditions. Our endeavor resulted in the first evidence of guanidinate complexes that contain radicals, namely, a mononuclear bipyridyl radical complex, {(Me3 Si)2 NC(Ni Pr)2 }2 Y(bpy• ) ( 1 ), and a dinuclear bis(benzimidazolyl) radical-bridged complex, [K(crypt-222)][{(Me3 Si)2 NC(Ni Pr)2 }2 Y]2 (μ-Bbim• ) ( 2' ). The latter was achieved by an in situ reduction of [{(Me3 Si)2 NC(Ni Pr)2 }2 Y]2 (μ-Bbim) ( 2 ), which was isolated from a salt metathesis reaction. 1 and 2 were characterized by X-ray crystallography and IR and UV-vis spectroscopy. Variable-temperature electron paramagnetic resonance spectroscopy was applied to gain insight into the distribution of unpaired spin density on 1 and 2' . Density functional theory calculations were conducted on 1 and 2' to elucidate further their electronic structures. The redox activity of 1 and 2' was also probed by electrochemical methods.
Full text links
Related Resources
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app