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1. Dithiolated peptides incorporating bis(tryptophan)s for cooperative mercury(II) binding

   https://doi.org/10.1016/j.bmc.2021.116296  

   Ngu-Schwemlein, Maria; Merle, John; Cameron, T'ea; Witcher, Charlexia; Todd, Daniel (August 2021, Bioorganic & Medicinal Chemistry)

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2. Synthesis, characterization, and electrocatalytic activity of bis(pyridylimino)isoindoline Cu( ii ) and Ni( ii ) complexes

   https://doi.org/10.1039/D0DT03030A  

   Saha, Soumen; Sahil, Sha Tamanna; Mazumder, Md. Motiur; Stephens, Alexander M.; Cronin, Bryan; Duin, Evert C.; Jurss, Jonah W.; Farnum, Byron H. (January 2021, Dalton Transactions)

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   Two NNN pincer complexes of Cu( ii ) and Ni( ii ) with BPI Me − [BPI Me − = 1,3-bis((6-methylpyridin-2-yl)imino)isoindolin-2-ide] have been prepared and characterized structurally, spectroscopically, and electrochemically. The single crystal structures of the two complexes confirmed their distorted trigonal bipyramidal geometry attained by three equatorial N-atoms from the ligand and two axially positioned water molecules to give [Cu(BPI Me )(H 2 O) 2 ]ClO 4 and [Ni(BPI Me )(H 2 O) 2 ]ClO 4 . Electrochemical studies of Cu( ii ) and Ni( ii ) complexes have been performed in acetonitrile to identify metal-based and ligand-based redox activity. When subjected to a saturated CO 2 atmosphere, both complexes displayed catalytic activity for the reduction of CO 2 with the Cu( ii ) complex displaying higher activity than the Ni( ii ) analogue. However, both complexes were shown to decompose into catalytically active heterogeneous materials on the electrode surface over extended reductive electrolysis periods. Surface analysis of these materials using energy dispersive spectroscopy as well as their physical appearance suggests the reductive deposition of copper and nickel metal on the electrode surface. Electrocatalysis and decomposition are proposed to be triggered by ligand reduction, where complex stability is believed to be tied to fluxional ligand coordination in the reduced state. 

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3. Activation and Functionalization of Organic Disulfides by Bis(Perfluoroalkyl) Complexes of Nickel(II)

   https://doi.org/10.1021/acs.organomet.5c00310  

   Ravidas, Cherry_Mae_T; Cramer, Roger_E; Vicic, David_A (October 2025, Organometallics)
4. Si–H Bond Activation and Dehydrogenative Coupling of Silanes across the Iron–Amide Bond of a Bis(amido)bis(phosphine) Iron(II) Complex

   https://doi.org/10.1021/jacs.2c12157  

   Stevens, Jeremiah E.; Moore, Curtis E.; Thomas, Christine M. (January 2023, Journal of the American Chemical Society)
5. Aziridination Reactivity of a Manganese(II) Complex with a Bulky Chelating Bis(Alkoxide) Ligand

   https://doi.org/10.3390/molecules27185751  

   Kurup, Sudheer S.; Woodland, Natalie M.; Lord, Richard L.; Groysman, Stanislav (September 2022, Molecules)

   Treatment of Mn(N(SiMe3)2)2(THF)2 with bulky chelating bis(alkoxide) ligand [1,1′:4′,1′′-terphenyl]-2,2′′-diylbis(diphenylmethanol) (H2[O-terphenyl-O]Ph) formed a seesaw manganese(II) complex Mn[O-terphenyl-O]Ph(THF)2, characterized by structural, spectroscopic, magnetic, and analytical methods. The reactivity of Mn[O-terphenyl-O]Ph(THF)2 with various nitrene precursors was investigated. No reaction was observed between Mn[O-terphenyl-O]Ph(THF)2 and aryl azides. In contrast, the treatment of Mn[O-terphenyl-O]Ph(THF)2 with iminoiodinane PhINTs (Ts = p-toluenesulfonyl) was consistent with the formation of a metal-nitrene complex. In the presence of styrene, the reaction led to the formation of aziridine. Combining varying ratios of styrene and PhINTs in different solvents with 10 mol% of Mn[O-terphenyl-O]Ph(THF)2 at room temperature produced 2-phenylaziridine in up to a 79% yield. Exploration of the reactivity of Mn[O-terphenyl-O]Ph(THF)2 with various olefins revealed (1) moderate aziridination yields for p-substituted styrenes, irrespective of the electronic nature of the substituent; (2) moderate yield for 1,1′-disubstituted α-methylstyrene; (3) no aziridination for aliphatic α-olefins; (4) complex product mixtures for the β-substituted styrenes. DFT calculations suggest that iminoiodinane is oxidatively added upon binding to Mn, and the resulting formal imido intermediate has a high-spin Mn(III) center antiferromagnetically coupled to an imidyl radical. This imidyl radical reacts with styrene to form a sextet intermediate that readily reductively eliminates the formation of a sextet Mn(II) aziridine complex. 

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