Ship‐in‐a‐Bottle Synthesis of a Large Guest Occupying Two Y Zeolite Neighbour Supercages: Characterisation and Photocatalytic Activity of the Encapsulated Bipyrylium Ion

Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion

“…The crystalline structure of faujasite-type zeolite Y is formed by almost spherical supercages (14 Å diameter) interconnected tetrahedrally through smaller openings (diameter 7.4 Å ). Accordingly, BTP 2+ ions cannot be accommodated inside a single zeolite Y supercage and would require two neighbour supercages as indicated by molecular modelizations [33]. The synthesis, characterization and some preliminary electrochemical data of BTP@Y have been previously reported [33].…”

“…Accordingly, BTP 2+ ions cannot be accommodated inside a single zeolite Y supercage and would require two neighbour supercages as indicated by molecular modelizations [33]. The synthesis, characterization and some preliminary electrochemical data of BTP@Y have been previously reported [33]. In the solution phase, BTP 2+ ions display two consecutive one-electron reduction processes mediated by comproportionation, as depicted in Fig.…”

“…As the reaction progresses, the solid becomes bright yellow in colour, visually indicating that pyrylium formation is taking place. BTP@MCM was prepared, as already described, upon adsorption of BTP 2+ prepared by reported methods in MCM-41 [33]. BTP@Y and BTP@MCM exhibit similar diffuse reflectance UV-Vis and IR spectra, described in detail elsewhere [33].…”

“…The synthesis and characterization of zeolite Y encapsulated BTP 2+ through a ship-in-a-bottle methodology has been previously reported [33]. Preparation of BTP@Y was carried out by stirring at reflux temperature a suspension of commercial (PQ CBV 720) dehydrated acidic zeolite (HY, Si/Al = 13) in an isooctane solution of dichalcone and a twofold excess of acetophenone.…”

“…Accordingly, it appears to be potentially interesting to explore the electrochemistry of large size organic cations unable to be exchanged with electrolyte cations. This is the case of bipyrylium bication, BTP 2+ (=[1,4-bis(3,5-diphenyl-4-pyrylium)phenylene]), which can be prepared in zeolite Y cavities through a shipin-a-bottle synthesis [33]. The crystalline structure of faujasite-type zeolite Y is formed by almost spherical supercages (14 Å diameter) interconnected tetrahedrally through smaller openings (diameter 7.4 Å ).…”