Synthesis and structure of binuclear iron(ii) complex with the cage-like ligand as a model of methane monooxygenase

New trends in tailoring active sites in zeolite-based catalysts

“…NO, O2, NO+O2) and temperature, 249 Metal oxo clusters can also be stabilized in zeolites by calcination of ionexchanged metal-zeolites. Based on this, several studies focused their interest on the formation of mono-µ-oxo-dinuclear or tri-nuclear metal complexes of different metals like Cu, [250][251][252] Ni, 253 Fe, [254][255][256] Ga, 257 and Zn 258 that mimic the active sites of enzymes. 259, 260. The nature of the formed metal oxo clusters is influenced by several parameters, including the zeolite topology, the number and position of framework aluminum atoms, the nature of the metal precursor and solution pH, and the final calcination conditions (temperature, gas flow, heating rate, and type of oxidant).…”

Conversion of Methane to Methanol with a Bent Mono(μ-oxo)dinickel Anchored on the Internal Surfaces of Micropores

“…53 In other words, the long-range crystal structure of NiO is needed for the observation of the satellite peak at 856.0 eV. 53 The lack of final state 3d 9 LL far −1 at 856.0 eV clearly shows that there is no NiO lattice. The unusual lack of the 3d 9 In-situ studies of Ni-ZSM5 during activation and catalysis using X-absorption spectroscopy were performed.…”

“…53 The lack of final state 3d 9 LL far −1 at 856.0 eV clearly shows that there is no NiO lattice. The unusual lack of the 3d 9 In-situ studies of Ni-ZSM5 during activation and catalysis using X-absorption spectroscopy were performed. Both XPS and EXAFS suggest the formation of a segment structure similar to that shown in Figure 6b.…”

“…Nature partially oxidizes methane to methanol. For instance, methane monooxygenases (MMO), an enzyme in nature, directly converts methane to methanol at ambient temperature. − The active sites in MMO could be bis­(μ-oxo)­di-iron complexes or bis­(μ-oxo)­dicopper complexes as shown in Scheme or even another bridge oxide structure. Scientists have expended significant effort to mimic the catalysis of MMO by developing artificial catalysts that have similar active sites. − …”