A Sr2+-metal-organic framework with high chemical stability: Synthesis, crystal structure and photoluminescence property

Abstract

Metal-organic frameworks (MOFs) are typically built by assembly of metal centres and organic linkers, and have emerged as promising crystalline materials in a variety of fields. However, the stability of MOFs is a key limitation for their practical applications. Herein, we report a novel Sr2+-MOF [Sr4(Tdada)2 (H2O)3(DMF)2] (denoted as NKU-105, NKU=Nankai University; H4Tdada = 5,5'-((thiophene-2,5-dicarbonyl)bis(azanediyl))diisophthalic acid; DMF = N, N-dimethylformamide) featuring an open square channel of about 6 Å along the c-axis. Notably, NKU-105 exhibits much outstanding chemical stability against common organic solvents, boiling water, acids and bases, relative to most MOF materials. Furthermore, NKU-105 is an environment-friendly luminescent material with a bright cyan emission. This article is part of the themed issue 'Coordination polymers and metal-organic frameworks: materials by design'.