A naphthalenediimide-based Cd-MOF as solvatochromic sensor to detect organic amines

Abstract

A novel naphthalenediimide-based metal-organic framework, {[Cd(DPNDI)(2,6-NDC)]·2DMF}n (1), has been constructed from mixed ligands of N,N′-Di(4-pyridyl)-1,4,5,8-naphthalene -tetracarboxydiimide (DPNDI) and naphthalene-2,6-dicarboxylic acid (2,6-NDC). 1 displays a two-fold interpenetrated 3D framework related to the 6-c connected pcu topology, which exhibits solvatochromic behavior in the presence of organic amines (electron rich). This solvatochromic behavior was investigated by solid state UV–Vis diffuse reflectance spectra and photo-luminescent spectra, which was arise from the inter-molecular electron-transfer transition from the different solvents to the DPNDI ligand depending on the electron-donating ability of the guest solvents. This work shows that the naphthalenediimide-based MOFs could be used as solvatochromic sensor to detect organic amines.