A Bifunctional Luminescent Metal–Organic Framework for the Sensing of Paraquat and Fe³⁺ Ions in Water

Abstract

The hydrothermalr eactiono fZ n 2+ + ions with a mixture of two ligands, Hcptpya nd H 3 btc (Hcptpy = 4-(4-carboxyphenyl)-2,2':4',4''-terpyridine; H 3 btc = 1,3,5-benzenetricarboxylic acid), led to the formationo fa3D metal-organic framework (MOF) with 1D channels, [Zn 2 (cptpy)(btc)(H 2 O)] n (1), which was structurally characterized by using single-crystal X-ray diffraction (SXRD). In MOF 1,t wo independentZ n 2+ + ions were interconnected by btc 3À ligands to form a1 D chain, whilst adjacent Zn 2+ + ions were alternatelyb ridged by cptpy À ligandst og eneratea2D sheet,w hich was further linked by 1D chains to form a3 Df ramework with an ew (3,3,4,4)-connected topology.F urthermore, compound 1 also exhibited excellent stability towards air and water and, more importantly,l uminescence experiments indicated that it could serve as ap robe for the sensitive detection of paraquat (PAQ) and Fe 3+ + ions in aqueous solution.

Zn(ii)/Cd(ii) based mixed ligand coordination polymers as fluorosensors for aqueous phase detection of hazardous pollutants

“…LMOF (41) mentioned in our earlier readings also had the ability for selective and sensitive sensing of Fe 3+ cations in water. The sensing ability of LMOF (41) is well supported by an energy transfer phenomenon between the donor and accepter with quenching constant 3.08 × 10 3 M −1 and LOD value 4.33 × 10 −6 M 91. Multiresponsive LCPs(42) and (43) also demonstrated excellent fluorescence quenching properties towards chromate anions with K sv values 6.6 × 10 4 , 5.3 × 10 4 M −1 and LOD values 7.00 × 10 −8 , 7.00 × 10 −8 M respectively 92.…”

A water-stable terbium metal–organic framework as a highly sensitive fluorescent sensor for nitrite

“…For the MOFs with sensing-based applications, [18][19][20] lanthanide MOFs (Ln-MOFs) have displayed excellent luminescence properties that can be taken into consideration. 21,22 Through the reasonable adjustment of the host-guest interactions, Ln-MOFs have been applied in the chemical sensing of ions, [23][24][25] organic small molecules, 26,27 volatile organic compounds (VOCs) 28 and gases, [29][30][31] nitro explosives, [32][33][34] biomolecules 35,36 and so on.…”

“…The K SV value of Tb-MOF is 4.74 × 10 5 M −1 . The K SV value is higher than that of most MOF-based ion sensing materials (usually 10 3 -10 4 M −1 ), indicating a high sensitivity of Tb-MOF towards nitrite [23][24][25]. The results of the three sets of fluorescence titrations (Fig.S6-S11 †) were combined in Fig.…”

Assembly of Two New Coordination Polymers: Luminescent Properties and Anti-inflammatory Activity on Postoperative Infectious Endophthalmitis

“…During the past few decades, as a kind of hybrid materials, the metal-organic frameworks (MOFs) have obtained wide exploration interest because of their extensive applications prospects in the heterogeneous catalysis, luminescence, nonlinear optics, gas storage/separation areas [3][4][5][6]. Up to now, various synthetic strategies have been developed to fabricate crystalline MOFs, e.g., mixed-ligand method, template-directed synthesis, pillar-layered strategy, second building unit method [7][8][9][10].…”