A Molybdenum Trioxide Hybrid Decorated by 3-(1,2,4-Triazol-4-yl)adamantane-1-carboxylic Acid: A Promising Reaction-Induced Self-Separating (RISS) Catalyst

authors	Lysenko, AB; Senchyk, GA; Domasevitch, KV; Henfling, S; Erhart, O; Krautscheid, H; Neves, P; Valente, AA; Pillinger, M; Goncalves, IS
nationality	International
journal	INORGANIC CHEMISTRY
keywords	TRIAZOLYLMOLYBDENUM(VI) OXIDE HYBRIDS; STRUCTURAL ELUCIDATION; OLEFIN EPOXIDATION; DIOXOMOLYBDENUM(VI) COMPLEXES; OXIDATIVE DESULFURIZATION; CYCLOOCTENE EPOXIDATION; CRYSTAL-STRUCTURES; HYDROGEN-PEROXIDE; COORDINATION; PERFORMANCE
abstract	3-(1,2,4-Triazol-4-yOadamantane-1-carboxylic acid (tradcH), a heterobifunctional organic ligand in which carboxylic acid and 1,2,4-triazole groups are united through a rigid 1,3-adamantanediyl spacer, was employed for the synthesis of a Mo-VI oxide organic hybrid. The ligand crystallized from water as tradcH center dot H2O (1), possessing a two-dimensional hydrogen-bonding network, and from ethanol as a cyclic molecular solvate with the composition (tradcH)(3)center dot 2EtOH (2). Treatment of tradcH with MoO3 under hydrothermal conditions afforded a new Mo trioxide hybrid, [MoO3(tradcH)]center dot H2O (3), which was structurally characterized. In 3, the molybdenum atoms form a polymeric zigzag chain of {mu(2)-O-MoO2} which is supported by double triazole bridges, while the carboxylic acid termini are left uncoordinated. The coordination environment of the Mo centers appears as distorted cis-{MoN2O4} octahedra. The hybrid exhibits high thermal stability (up to 270 degrees C) and was employed for a relatively broad scope of catalytic oxidation reactions in the liquid phase. Its catalytic behavior may be compared to a reversible mutation, featuring the best sides of homogeneous and heterogeneous catalysis. The original solid material converts into soluble active species, and the latter revert to the original material upon completion of the catalytic reaction, precipitating and allowing straightforward catalyst separation/reuse (like a heterogeneous catalyst). This catalyst was explored for a chemical reaction scope covering sulfoxidation, oxidative alcohol dehydrogenation, aldehyde oxidation, and olefin epoxidation, using hydrogen peroxide as an eco-friendly oxidant that gives water as a coproduct.
publisher	AMER CHEMICAL SOC
issn	0020-1669
isbn	1520-510X
year published	2019
volume	58
issue	24
beginning page	16424
ending page	16433
digital object identifier (doi)	10.1021/acs.inorgchem.9b02137
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000503330800014