Solvent-free synthesis and optical properties of two open-framework metal oxalates with zeolitic ABW and diamondoid topologies

Abstract

Two new metal oxalates, namely, C₉H₂₅N₃·Sc₂(C₂O₄)₄·2H₂O (1) and C₉H₂₅N₃·In₂(C₂O₄)₄ (2), have been prepared under solvent-free conditions. They have different 4-connected frameworks with zeolitic ABW and diamondoid topologies, respectively. Notably, compound 2 displays a moderate second-harmonic-generation response under 1064 nm laser irradiation. Theoretical calculations are performed to gain insight into the optical properties of the two compounds.