2D → 3D polycatenated Zn(ii) metal–organic framework with good chemical stability as a fluorescent sensor toward salicylaldehyde, acetylacetone and H2PO4−

JXUST-44 can sensitively and selectively detect salicylaldehyde (SA), acetylacetone (acac) and H 2 PO 4 − with a low detection limit. It has good anti-interference and excellent recyclability toward analytes.