Modulation of S and N Active Sites for Coordination Polymers to Achieve Enhanced Hg²⁺ Sensing Performances

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 29, 2025

It is challenging and vital to develop coordination polymers (CPs) with an outstanding sensing performance. In this work, CP-based sensors active S N sites are first exploited. Three new Cu-CPs [Cu(L)(SCN)2·2DMF]n (1), [Cu(L)(SCN)·2DMF]n (2), [Cu(L)(CN)·2DMF]n (3) were successfully synthesized by 9,10-bis(di(pyrimidin-5-yl)methylene)-9,10-dihydroanthracene (L) SCN-/CN- ligands. 1 demonstrates a 1D wavelike chain, fabricated L bridges linking Cu(SCN)2 units. 2 exhibits 2D (3,3)-connected network SCN-, 3-connected L, Cu 3 3D framework, built 4-connected centers, CN-, bridges. 1-3 have good water, pH, thermal stabilities. uncoordinated can detect Hg2+ through the fluorescence enhancing ("turn-on") effect. Meanwhile, only has shows negative ability. ultrahigh sensitivity selectivity. The KSV LOD of toward about 5 times superior those 2, separately. represent S- N-rich exhibit excellent "turn-on" capacity. Their mechanism difference performances discussed in detail.

Language: Английский

Microstructural Modulation of Isomorphic Luminescent Coordination Polymers To Achieve Sensing Effect Transformation

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

The sensing effect transformation is first exploited by microstructural modulation. Two AIE functional ligands L-1 and L-2 were developed to construct two isomorphic coordination polymers [Cu(L-1)2(SCN)2]n (1) [Cu(L-2)2(SCN)2]n (2), respectively (L-1 = 4,4'-((9H-fluoren-9-ylidene)-methylene)dipyridine; 5,5'-((9H-fluoren-9-ylidene)-methylene)dipyrimidine). 1 2 exhibit 1-D single-chain architectures have good water, pH, thermal stabilities. show the functional-ligand-originated luminescence reduced emission intensities. stack in a back-to-back manner with distances of 4.61 5.38 Å, resulting distinct MnO4- effects for 2. exhibits "turn-off" (luminescence quenching) sensing. In sharp contrast, shows "turn-on" enhancing) ability ultrahigh sensitivity. Particularly, represents sensor. Their mechanism toward discussed detail.

Language: Английский