Labile silver(I) complexes with benzisothiazolinone anion and phosphines: Synthesis, characterization and hydrogen storage application
Mustafa A. Alheety, Subhi A. Al‐Jibori, Huda A. Nuaman, Abdulwahhab H. Majeed, Pramod K. Singh, Shalu, M. Z. A. Yahya
Abstract
Abstract A silver complex was prepared with benzisothiazolinone ligand, which was used to prepare new phosphorus‐rich complexes with dppe and dppp. All complexes were diagnosed by FTIR, 1 H‐NMR, 31 P‐NMR, CHN, and molar conductivity. The results proved that phosphines were labile, therefore 31 P‐NMR was measured by cryoprotection at different temperatures. As a promoted effort to obtain direct experimental proof for the dimeric and the labile nature of [Ag(bit)(diphos)] 2 complexes in solution, the 31 P{ 1 H}‐NMR spectrum of mixed (dppe/dppp) ligand complexes was measured. It was anticipated that an exchange of phosphines occurred between [Ag(bit)(dppe)] 2 and [Ag(bit)(dppp)] 2 complexes. However, a distribution of the dppp and dppe should result, and complex with compositions of [Ag 2 (bit) 2 (dppe)(dppp)] will be formed. The phosphine‐containing complexes were used in hydrogen storage study. The results proved that hydrogen storage values were initially similar for [Ag(bit)(dppp)] 2 and [Ag(bit)(dppe)] 2 , but increased significantly for [Ag(bit)(dppe)] 2 at higher pressures to reach 4.35 wt% at 90 bar.