A Sr 2+ -metal–organic framework with high chemical stability: synthesis, crystal structure and photoluminescence property

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 (H2 O)3 (DMF)2 ] (denoted as NKU-105 , NKU = Nankai University; H4 Tdada = 5,5'-((thiophene-2,5-dicar bonyl)bis(azanediyl))diisophthalic acid; DMF = N,N -dimethylformamide) featuring an open square channel of about 6 Å along thec -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’.