Heterometallic Alkaline Earth–Lanthanide Ba^II–La^III Microporous Metal–Organic Framework as Bifunctional Luminescent Probes of Al³⁺ and MnO₄^–

Abstract

In this work a rigid asymmetrical tricarboxylate ligand p-terphenyl-3,4″,5-tricarboxylic acid (H3L) has been employed, and a unique heterometallic alkaline earth-lanthanide microporous luminescent metal-organic framework (MOF) {[Ba3La0.5(μ3-L)2.5(H2O)3(DMF)]·(3DMF)}n (1·3DMF) (DMF = dimethylformamide) has been isolated under solvothermal conditions. Single-crystal X-ray structural analysis demonstrates that 2D inorganic Ba-O-La connectivity can be observed in 1, which are further bridged via rigid terphenyl backbones of L(3-), forming a unique I(2)O(1)-type microporous luminescent framework. A 1D microporous channel with dimensionality of 9.151(3) Å × 10.098(1) Å can be observed along the crystallographic a axis. PXRD patterns have been investigated indicating pure phases of 1. The luminescence explorations demonstrated that 1 exhibits highly selective and sensitive sensing for Al(3+) over other cations with high quenching efficiency Ksv value of 1.445 × 10(4) L·mol(-1) and low detection limit (1.11 μM (S/N = 3)). Meanwhile 1 also exhibits highly selective and sensitive sensing for MnO4(-) over other anions with quenching efficiency Ksv = 7.73 × 10(3) L·mol(-1) and low detection limit (0.28 μM (S/N = 3)). It is noted that, when different concentrations of MnO4(-) solutions (0.5 to 100 μM) were dropped into the suspension of 1, the bright blue luminescence of the suspension observed under UV light can gradually change into pink color, indicating visually luminescent sensing, which makes the detection process of MnO4(-) more convenient in practical. The result also reveals that 1 represents the first example of bifunctional heterometallic alkaline earth-lanthanide MOF-based luminescent probes for selectively detecting Al(3+) and MnO4(-) in the water solutions.

Multifunctional Luminescence Sensors Assembled with Lanthanide and a Cyclotriveratrylene‐Based Ligand

“…The result indicates that both compounds are capable of selective detection abilities for MnO 4 – , and compound 2 is much more sensitive than 1 . By comparing the detection ability with a related sensor, 2 is better than the reported Ln CP [Ba 3 La 0.5 (µ 3 ‐L′) 2.5 (H 2 O) 3 (DMF)] · (3DMF) (H 3 L′ = p ‐terphenyl‐tricarboxylic acid, with a K sv value of 7.73 × 10 3 m –1 ) …”

Solvo‐thermal Preparation and Characterization of Two CdII Coordination Polymers Constructed From 2,6‐(1,2,4‐Triazole‐4‐yl)pyridine and 5‐R‐Isophthalic Acid (R = Nitro, Sulfo)

“…We are interesting in the preparation of new fluorescent coordination compounds, which can be applied as photo‐luminescent materials with attractive fluorescent applications . In this work under solvo‐thermal conditions, two novel Cd II mixed‐ligand coordination materials with 2,6‐(1,2,4‐triazole‐4‐yl)pyridine (L 1 ) and aromatic di‐carboxylic acid co‐ligands, namely [Cd(L 1 )(NO 2 ‐BDC)(H 2 O) 2 ] · 2H 2 O ( 1 ) and [Cd(L 1 )(HSIP)(H 2 O)] · 4H 2 O ( 2 ) (NO 2 ‐H 2 BDC = 5‐nitroisophthalic acid, H 3 SIP = 5‐sulfobenzene‐1,3‐dicarboxylic acid) were designed and synthesized (Scheme ).…”

A dual-emission nano-rod MOF equipped with carbon dots for visual detection of doxycycline and sensitive sensing of MnO4−

“…33 However, it is toxic, corrosive and harmful to human health, and can lead to respiratory infections and skin irritation. 34 Hence, the precise detection of MnO 4 À has become a major component of waterpollution detection for environmental evaluation. In this work, we report a bifunctional hybrid material CDs@MOF(Eu) that can detect doxycycline and MnO 4…”