A new route to polyoxometalates via mechanochemistry

Abstract

Mechanochemistry offers a new route to polyoxometalates (POMs) under mild conditions. The molybdenum isoPOM heptamolybdate and the molybdenum heteroPOMs of the Strandberg- and Keggin-type could be achieved from grinding together...

Tribochemical nanolithography: selective mechanochemical removal of photocleavable nitrophenyl protecting groups with 23 nm resolution at speeds of up to 1 mm s−1

“…In recent years there has been an explosion of interest in mechanochemistry, [17][18][19] the mechanical activation of chemical reactivity. [19][20][21][22][23][24][25][26][27][28][29][30][31] In bulk phases, mechanical grinding enables solventless mechanochemical synthesis, 21,32 attracting growing interest as a means to mitigate the environmental impact of chemical processes. 33 At interfaces, tribochemical processes are known to play a role in determining the performance of lubrication systems.…”

Assembly of Uranyl Peroxides from Ball Milled Solids

“…21,22 LAG has recently been applied to form U(VI) triperoxide solids from UO 3 and UO 2 with solid sodium and lithium peroxides. 23,24 A recent report of direct assembly of molybdenum polyoxometalate clusters by ball milling 25 encouraged us to explore the solid-state assembly processes of uranyl peroxides via mechanochemistry to potentially form UPCs. Herein, we mechanochemically synthesize lithium uranyl triperoxides from UO 2 or studtite and observe the subsequent spontaneous crystallization of diperoxodioxouranium(VI) dimers in the solid state from a product left under ambient conditions.…”

“…Both LAG and SAG could potentially reduce the water and radioactive liquid waste volumes required for the assembly of UPCs and provide a means of understanding the conversion of uranium-containing solids upon exposure to peroxide and small quantities of moisture, which may occur in nuclear waste repositories or other environments. , LAG has recently been applied to form U­(VI) triperoxide solids from UO 3 and UO 2 with solid sodium and lithium peroxides. , A recent report of direct assembly of molybdenum polyoxometalate clusters by ball milling encouraged us to explore the solid-state assembly processes of uranyl peroxides via mechanochemistry to potentially form UPCs. Herein, we mechanochemically synthesize lithium uranyl triperoxides from UO 2 or studtite and observe the subsequent spontaneous crystallization of diperoxodioxouranium­(VI) dimers in the solid state from a product left under ambient conditions.…”

Exploring the In Situ Formation Mechanism of Polymeric Aluminum Chloride–Silica Gel Composites under Mechanical Grinding Conditions: As a High-Performance Nanocatalyst for the Synthesis of Xanthene and Pyrimidinone Compounds

“… 5 − 8 Because mechanochemistry does not require the use of solvents in the reaction process, it has been hailed as one of the most promising technologies for green synthesis and catalysis. 9 − 13 While mechanochemistry often brings unexpected surprises to researchers in terms of results, the mechanism of catalysis in the process is still like a “black box” full of uncertainties. For this reason, it is important to investigate the reaction process in detail and to reveal the reaction mechanism.…”

“…Among them, the reaction process and the product purification process are the most serious pollution stages because they require the use of large amounts of solvents. Many research groups have contributed to the greening of both processes and achieved good results. − The mechanochemical synthesis of organic molecules offers the advantages of a simple operating technique, low energy consumption, decreased waste treatment, and ease of large-scale manufacturing. − Because mechanochemistry does not require the use of solvents in the reaction process, it has been hailed as one of the most promising technologies for green synthesis and catalysis. − While mechanochemistry often brings unexpected surprises to researchers in terms of results, the mechanism of catalysis in the process is still like a “black box” full of uncertainties. For this reason, it is important to investigate the reaction process in detail and to reveal the reaction mechanism. − …”