Two Allogons of an O -activating Bis(disiloxido)ferrate(II) Accessible Selectively just by Variation of the Crystallization Temperature.

Deprotonation of O(iPr SiOH) ( LH ) with LiOtBu followed by reaction with FeCl in THF led to the complex [ L Fe][Li(THF) ] , 2, which represents a structural and spectroscopic model of the α-Fe sites of Fe/ZSM-5. Reaction with O in THF solution proceeds rather fast and is complete within 200 ms; an intermediate O adduct could not be identified by stopped-flow methods. Cooling blue solutions of 2 to -80 °C led to the growth of blue crystals of 2⋅THF, the analysis of which by XRD revealed a FeO core that is somewhat distorted from planarity towards a tetrahedral structure.

A Copper Cage-Complex as Mimic of the pMMO Cu Site.

The active site of particulate methane monooxygenase (pMMO) and its mechanism of action are not known. Recently, the Cu site emerged as a potential active site, but to date it lacks any study on biomimetic resemblance of the coordination environment provided by the enzyme. Here, the synthesis of a cage ligand providing such an environment is reported.

Electrochemistry and Reactivity of Chelation-stabilized Hypervalent Bromine(III) Compounds.

Hypervalent bromine(III) reagents possess a higher electrophilicity and a stronger oxidizing power compared to their iodine(III) counterparts. Despite the superior reactivity, bromine(III) reagents have a reputation of hard-to-control and difficult-to-synthesize compounds. This is partly due to their low stability, and partly because their synthesis typically relies on the use of the toxic and highly reactive BrF as a precursor.

Synthesis of an Fe(terpy-cage) dumbbell.

An azide masked amine is used to obtain a cage of lower symmetry that possess one terpy-group in an -position. This group can coordinate to iron(ii), yielding selectively an easy to purify Fe(terpy-cage) dumbbell. The dumbbell can also be obtained in a one pot reaction, which proceeded without isolation of the -functionalized cage.