Lewis Acid Guests in a {P8W48} Archetypal Polyoxotungstate Host: Enhanced Proton Conductivity via Metal‐Oxo Cluster within Cluster Assemblies. (30th July 2018)

• Record Type: Journal Article
• Authors: Yang, Peng; Alsufyani, Maryam; Emwas, Abdul‐Hamid; Chen, Chaoqin; Khashab, Niveen M.
• Is Part Of: Angewandte Chemie. Volume 130:Number 40(2018)
• Page Start: 13230
• Page End: 13235
• Publication Date: 2018-07-30
• Subjects: Anorganische Wirte -- Lewis-Säuren -- Polyoxometallate -- Protonenleitfähigkeit -- Wirt-Gast-Assemblierung; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201806086
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Complexes made by hosts that completely surround their guests provide a means to stabilize reactive chemical intermediates, transfer biologically active cargo to a diseased cell, and construct molecular‐scale devices. By the virtue of inorganic host–guest self‐assembly, nucleation processes in the cavity of a {P8 W48 }‐archetype phosphotungstate has afforded a nanoscale 16‐Al III ‐32‐oxo cluster and its Ga III analogue that contain the largest number of Al III /Ga III ions yet found in polyoxometalate (POM) chemistry. Interestingly, the rich Lewis acid Al III centers within the Lewis base POM support shows an exceptional proton conductivity of 4.5×10 −2 S cm −1 (85 °C, 70 % RH; RH: relative humidity), which is by far the highest conductivity reported among POM‐based single‐crystal proton conductors. Abstract : Saure Gäste : Die Wirt‐Gast‐Assemblierung des radförmigen {P8 W48 }‐Phosphowolframats mit stark Lewis‐sauren Zentren führt zu Polyoxometallaten (POMs) mit den bisher größten Al III ‐ und Ga III ‐Oxoclustern. Die erhöhte Protonenleitfähigkeit der Al III ‐Derivate wird durch den synergistischen Effekt der reichhaltigen Lewis‐Säure/Base‐Paare mit den sauren Nitratfunktionen hervorgerufen.