We report herein the use of the (dihydrido)iron catalyst, Fe(H)2(dmpe)2, for the selective reduction of CO2 into either bis(boryl)acetal or methoxyborane depending on the hydroborane used as a reductant. In a one-pot two-step procedure, the in situ generated bis(boryl)acetal was shown to be a reactive and versatile source of methylene to create new C-N but also C-O and C-C bonds.

A Zr-MOF, which contains partially hydrated, 12-connected {Zr6} nodes and extended carboxylate ligands was synthesized, characterised and utilised in CO2 cycloaddition catalysis.

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The complex mol­ecule of the title compound, [Mn(C13H10N4O8)(H2O)2] or [Mn(H4pbidc)(H2O)2] (H6pbidc = 2,2′-(propane-1,3-di­yl)bis­(1H-imidazole-4,5-dicarb­oxy­lic acid), has 2 symmetry with the twofold rotation axis running through the Mn2+ cation and the central C atom of the propanediyl unit. The cation is six-coordinated by two N atoms and two O atoms from one H4pbidc2− anion and two water O atoms in a considerably distorted octa­hedral coordination. In the crystal, adjacent mol­ecules are linked through O—H⋯O and N—H⋯O hydrogen bonds into a three-dimensional network.

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A Mn coordination cluster whose core shares some features with the natural oxygen evolving complex provides a bio-inspired complex that promotes catalytic H₂O oxidation at neutral pH value.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.004 Å; disorder in main residue; R factor = 0.040; wR factor = 0.098; data-to-parameter ratio = 12.5.In the title complex, [Ni(C 13

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