A novel three-dimensional copper aspartate coordination compound with efficient photoluminescence

Abstract

Solvothermal reaction of a copper salt, racemic aspartic acid (AspH3), and 1,2,4-triazole (TaH) leads to a nanoporous copper aspartate, Cu4(Asp)2(Ta)2(H2O)2 · 2H2O (1). The compound was characterized by FT-IR spectroscopy and elemental analysis, and the structure was determined by single-crystal X-ray diffraction. Pairs of l-Asp3− and d-Asp3− ligands in unprecedented μ4-1,2κO:3,4κOκN coordination modes chelate pairs of adjacent copper cations to form a centrosymmetric 8n-membered rectangular pipe, and these pipes are further bridged by copper cations in four directions of the bc plane to form a 3D porous structure with approximately rectangular channels of ~ 5 × 10 Å2 along the crystallographic a-axis. Along the corners of the rectangular channels, each Ta− ligand connects three adjacent copper cations in a μ3 coordination mode to form the final 3D porous framework with relatively large rectangular channels of ~ 2 × 8 Å2 along the a-axis. Water molecules reside in these large channels. The thermal stability and solid-state photoluminescence properties of the title compound are also investigated.

Aspartic acid based metal–organic frameworks with dual function of NADH peroxidase and glycerol dehydrogenase-mimicking activities

“…23 A typical amino acid, aspartic acid, featuring one amino group and two carboxylate groups has been demonstrated to be able to coordinate with metal ions. [24][25][26][27][28][29] Yet, NADH peroxidase-mimetic activities of aspartic acid-based metal-organic frameworks have not been reported hitherto. Besides, applications of nanozyme concentrated more on biomedical applications 30 including immunoassay for bioanalysis, 31,32 disease diagnosis, in vivo imaging and disease therapy.…”