Phosphinic acids as building units in materials chemistry
10.1016/j.ccr.2020.213748
This study explores the diverse applications of phosphinic acids in materials science. Phosphinic acids, with the general formula R1R2POOH, are versatile ligands capable of forming a wide range of binding motifs with various metal ions. The study highlights their synthesis methods and roles in coordination polymers, surface modifications, nanoparticle synthesis, and sol–gel processes. The unique electronic and steric tunability of phosphinic acids, due to their two substituents directly attached to the phosphorus atom, allows for the creation of materials with distinct properties that cannot be replicated by analogous phosphonates or carboxylates. The review also emphasizes recent advancements and future research directions in this field, showcasing the potential of phosphinic acids to enhance material properties and functionalities.
Solution Deposition of Phenylphosphinic Acid Leads to Highly Ordered, Covalently Bound Monolayers on TiO2 (110) Without Annealing
10.1021/acs.jpcc.7b04167
The study investigates the solution deposition of phenylphosphinic acid on rutile TiO2 (110) surfaces to form highly ordered, covalently bound phenylphosphinate monolayers without annealing. Phenylphosphinic acid is used to create monolayers that can impart new functionality to metal oxide surfaces for various applications. The researchers found that solution deposition results in near-ideal, dense phenylphosphinate monolayers covalently bound in a bridged bidentate geometry. The monolayers are characterized using techniques such as scanning tunneling microscopy (STM), X-ray photoemission spectroscopy (XPS), and infrared spectroscopy. Despite their covalent attachment and higher binding energy than corresponding carboxylic acids, the phenylphosphinate monolayers are easily removed by a water rinse, which also oxidizes about 25% of the monolayer to the more stable phenylphosphonate. This study provides insights into the initial stages of monolayer formation and bonding geometry on metal oxide surfaces, which can help tailor monolayer properties for specific applications.
10.1016/j.tet.2018.03.048
The study focuses on the selective synthesis of 1,4,5-trisubstituted imidazoles from α-imino ketones, which are prepared through N-heterocyclic-carbene (NHC)-catalyzed aroylation of imidoyl chlorides with aromatic aldehydes. The research outlines a straightforward methodology that involves NHC-catalyzed aroylation, followed by chemoselective reduction of the imino group, and subsequent annulation with formamide to form the imidazole ring. This approach allows the rapid and regioselective synthesis of imidazole derivatives with potential applications in pharmaceuticals and agrochemicals. The study demonstrates the substrate scope and optimization of reaction conditions, highlighting the importance of this method in creating chemical libraries for further application.