Reversible hydrogen adsorption at room temperature using a molybdenum–dihydrogen complex in the solid state. Issue 36 (18th August 2021)

• Record Type: Journal Article
• Authors: Uchida, Kaiji; Kishimoto, Naoki; Noro, Shin-ichiro; Iguchi, Hiroaki; Takaishi, Shinya
• Is Part Of: Dalton transactions. Volume 50:Issue 36(2021)
• Page Start: 12630
• Page End: 12634
• Publication Date: 2021-08-18
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt01404h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Reversible hydrogen adsorption at ambient temperature was realized using molybdenum complex, [Mo(PCy3 )2 (CO)3 ], in the solid state. Abstract : Reversible H2 storage under mild conditions is one of the most important targets in the field of materials chemistry. Dihydrogen complexes are attractive materials for this target because they possess moderate adsorption enthalpy as well as adsorption without cleavage of the H–H bond. In spite of these advantages, H2 adsorption studies of dihydrogen complexes in the solid state are scarce. We herein present H2 adsorption properties of the 16-electron precursor complex ([Mo(PCy3 )2 (CO)3 ]) in the solid state synthesized by two procedures. One is the direct synthesis under an Ar atmosphere (1 ), and the other is removal of the N2 -adduct under vacuum (2 ). 2 showed ideal Langmuir type reversible ad/desorption of H2 above room temperature, whereas 1 showed irreversible adsorption. The adsorption enthalpy of 2 was larger than that in THF solution. Using DFT calculation, this difference was explained by the absence of the agostic interaction in the solid state.