Indolin-2-one Nitroimidazole Antibiotics Exhibit an Unexpected Dual Mode of Action.

Nitroimidazoles such as metronidazole are used as anti-infective drugs against anaerobic bacteria. Upon reduction of the nitro group, reactive radicals damage DNA and proteins in the absence of oxygen. Unexpectedly, a recent study of nitroimidazoles linked to an indolin-2-one substituent revealed potent activities against aerobic bacteria.

Co-Mabiq Flies Solo: Light-Driven Markovnikov-Selective C- and N-Alkylation of Indoles and Indazoles without a Cocatalyst.

Indoles and indazoles are common moieties in pharmaceuticals and naturally occurring bioactive compounds. The development of light-driven methods using earth-abundant transition-metal catalysts offers an attractive route for functionalization of such compounds. Herein, we report a visible-light-induced method for the C3- and N-alkylation of indoles and indazoles with styrenes, catalyzed by Co complexes based on the macrocyclic Mabiq ligand (Mabiq = 2-4:6-8-bis(3,3,4,4-tetramethyldihydropyrrolo)-10-15-(2,2'-biquinazolino)-[15]-1,3,5,8,10,14-hexaene-1,3,7,9,11,14-N).

Introducing Benzene-1,3,5-tri(dithiocarboxylate) as a Multidentate Linker in Coordination Chemistry.

Benzene-1,3,5-tri(dithiocarboxylate) (BTDTC), the sulfur-donor analogue of trimesate (BTC, benzene-1,3,5-tricarboxylate), is introduced, and its potential as a multidentate, electronically bridging ligand in coordination chemistry is evaluated. For this, the sodium salt NaBTDTC has been synthesized, characterized, and compared with the sodium salt of the related ditopic benzene-1,4-di(dithiocarboxylate) (NaBDDTC). Single-crystal X-ray diffraction of the respective tetrahydrofuran (THF) solvates reveals that such multitopic aromatic dithiocarboxylate linkers can form both discrete metal complexes (NaBTDTC·9THF) and (two-dimensional) coordination polymers (NaBDDTC·4THF).

Dispersion forces drive water oxidation in molecular ruthenium catalysts.

Rational design of artificial water-splitting catalysts is central for developing new sustainable energy technology. However, the catalytic efficiency of the natural light-driven water-splitting enzyme, photosystem II, has been remarkably difficult to achieve artificially. Here we study the molecular mechanism of ruthenium-based molecular catalysts by integrating quantum chemical calculations with inorganic synthesis and functional studies.

Influence of a Lanthanide Ion on the Ni Site of a Heterobimetallic 3d-4f Mabiq Complex.

This work presents the synthesis and characterization of a 3d-4f bimetallic complex based on the redox-active macrocyclic biquinazoline ligand, Mabiq. The mixed Yb-Ni complex, [(Cp*)Yb(Mabiq)Ni]BArF (), was synthesized upon reaction of [Ni(Mabiq)]BArF () with (Cp*)Yb(OEt). The molecular structures of and its sister complex, [(Cp*)Yb(Mabiq)Ni][(Cp*)Yb(OTf)] (), confirmed the presence of a Yb(III) center and a reduced Ni-Mabiq unit.

Neighbouring effects on catalytic epoxidation by Fe-cyclam in M-PDIxCy complexes.

The unsymmetric PDIeCy ligand, featuring pyridinediimine and cylam sites, can be selectively metalated. Complementing the diiron compound, we have synthesized two heterobimetallic isomers, [ZnPDIFeCy(PDIeCy)(OTf)4] (3) and [FePDIZnCy(PDIeCy)(OTf)4] (4), and a dizinc complex, [Zn2(PDIeCy)(OTf)4] (5). Olefin epoxidation by the series of complexes was investigated.