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• W2897733988 abstract "Hydrogen bonds (H-bonds) within the secondary coordination sphere are often invoked as essential noncovalent interactions that lead to productive chemistry in metalloproteins. Incorporating these types of effects within synthetic systems has proven a challenge in molecular design that often requires the use of rigid organic scaffolds to support H-bond donors or acceptors. We describe the preparation and characterization of a new hybrid tripodal ligand ([H2pout]3–) that contains two monodeprotonated urea groups and one phosphinic amide. The urea groups serve as H-bond donors, while the phosphinic amide group serves as a single H-bond acceptor. The [H2pout]3– ligand was utilized to stabilize a series of Mn–hydroxido complexes in which the oxidation state of the metal center ranges from 2+ to 4+. The molecular structure of the MnIII–OH complex demonstrates that three intramolecular H-bonds involving the hydroxido ligand are formed. Additional evidence for the formation of intramolecular H-bonds was provided by vibrational spectroscopy in which the energy of the O–H vibration supports its assignment as an H-bond donor. The stepwise oxidation of [MnIIH2pout(OH)]2– to its higher oxidized analogs was further substantiated by electrochemical measurements and results from electronic absorbance and electron paramagnetic resonance spectroscopies. Our findings illustrate the utility of controlling both the primary and secondary coordination spheres to achieve structurally similar Mn–OH complexes with varying oxidation states." @default.
• W2897733988 created "2018-10-26" @default.
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• W2897733988 date "2018-10-09" @default.
• W2897733988 modified "2023-10-15" @default.
• W2897733988 title "Manganese–Hydroxido Complexes Supported by a Urea/Phosphinic Amide Tripodal Ligand" @default.
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• W2897733988 doi "https://doi.org/10.1021/acs.inorgchem.8b01886" @default.
• W2897733988 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6251726" @default.
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