5,5′‐(1,4‐Dioxo‐1,2,3,4‐tetrahydrophthalazine‐6,7‐diyl)bis(oxy)diisophthalate‐Based Coordination Polymers and their TNP Sensing Ability

The simple hydrothermal self‐assembly of metal ions, 5,5′‐(4,5‐dicarboxy‐1,2‐phenylene)bis(oxy)diisophthalic acid (L1 ' ), and N 2 H 4 · H 2 O at pH = 8 (adjusted by oxalic acid) created two new acylhydrazinetetracarboxylate‐extended 3‐D Sr 2+ and Ba 2+ coordination polymers [Sr 2 (HL1)(H 2 O)] (H 5 L1 = 5,5′‐(1,4‐dioxo‐1,2,3,4‐tetrahydrophthalazine‐6,7‐diyl)bis(oxy)diisophthalic acid) 1 and [Ba 5 (HL1) 2 (ox)(H 2 O) 2 ] · 6H 2 O · N 2 H 4 (ox = oxalate) 2 . H 5 L1 originated from the in situ acylation of L1′ with N 2 H 4 . X‐ray single‐crystal diffraction analysis reveals that (i) the 3‐D network of 1 is based on a rod‐like secondary building unit (SBU), which can be described as an alternate arrangement of two types of dinuclear Sr‐O clusters; (ii) the 3‐D network of 2 is also based on a rod‐like SBU. The different is that the SBU for 2 can be described as an alternate arrangement of a kind of trinuclear cluster and a kind of tetranuclear cluster. Both 1 and 2 emit blue light. With regard to their good photoluminescence properties, their trinitrophenol (TNP) sensing ability was investigated. The results indicate that both can selectively detect TNP. The quenching constants K sv are calculated to be 3.21 × 10 4 m –1 for 1 and 2.98 × 10 4 m –1 for 2 , respectively.