Assembly of Framework‐Isomeric 4 d–4 f Heterometallic Metal–Organic Frameworks with Neutral/Anionic Micropores and Guest‐Tuned Luminescence Properties

Abstract

Framework-isomeric three-dimensional (3D) Cd-Ln heterometallic metal-organic frameworks (HMOFs), {[Ln2 (ODA)6 Cd3 (H2 O)6 ]⋅6 H2 O}n (Ln=Gd (1 a) and Tb (1 b), ODA=oxydiacetic acid) and {[Cd(H2 O)6 ]⋅[Ln2 (ODA)6 Cd2 ]⋅H2 O}n (Ln=Gd (2 a), Tb (2 b)), with neutral and anionic pores, respectively, were designed based on a lanthanide metalloligand strategy and synthesized by using a stepwise assembly and a hydrothermal method. Luminescence studies revealed that 1 b and 2 b can act as luminescent metal-organic frameworks and their light-emitting properties can be modulated by small guest molecules and the manganese counterion, respectively.

Luminescence-colour-changing sensing of Mn2+ and Ag+ ions based on a white-light-emitting lanthanide coordination polymer

“…4b and c, the luminescence colour of the samples obviously turns to red and blue, respectively, when the concentration of analytes is 5 Â 10 À8 M, suggesting that the detection limit of complex 4 (1 mL 0.01 M DMF solution) is lower than 5 Â 10 À8 M (Ln 3+ : M n+ 4 2 Â 10 6 : 1; M n+ = Ag + and Mn 2+ ), which is far superior to most reported fluorescence probes for Ag + and Mn 2+ ions (Table 1), 9,10 and meets the 0.05 ppm (4.6 Â 10 À7 M) standard of U.S. EPA and WHO for the maximum allowable level of Ag + ions in drinking water. According to the photographs in Fig.…”

“…8 However, existing reports on Ag + ion luminescent sensing using lanthanide-based compounds could not satisfy such a low detection limit. 10 Herein, we synthesize a white-light-emitting material through three isomorphic 1D chain-like LnCPs based on L-O,O 0 -dibenzoyl tartaric acid (L-DBTA). 10 Herein, we synthesize a white-light-emitting material through three isomorphic 1D chain-like LnCPs based on L-O,O 0 -dibenzoyl tartaric acid (L-DBTA).…”

“…According to Fig. The sensing behaviours for Ag + and Mn 2+ ions of the white-light material retain luminescence-colour stability and are hardly affected by temperature (20-90 1C) and pH value (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). Several cations, such as Cr 3+ , Cu 2+ , Fe 2+ , Fe 3+ and Hg 2+ ions, exhibit a drastic quenching effect due to dynamic and/or static factors, which has been widely reported previously.…”

Crystal structures and luminescence properties of two Cd(II) complexes based on 2-(1H-imidazol-1-methyl)-6-methyl-1H-benzimidazole

“…The interest originates not only from their fascinating architectures and topologies but also from their potential applications in many fields such as magnetism, photoluminescence, gas storage, and catalysis [1][2][3][4][5]. In addition, predicting the self-assembly of complexes still is a long-term challenge, owing to various factors such as pH value, molar ratio of reactants, solvent, and temperature [6][7][8].…”

Ln-Ag heterometallic coordination polymers

“…Many heterometallic single-molecular magnets have been reported, which can serve as an excellent model to understand these interactions (Sharples and Collison 2014). Metal-organic frameworks containing f and d metal centers with pores are of great interest to be applied in catalysis, gas storage, chemical separation, and ion exchange (Yan et al 2012, Ma et al 2013. And Ln and transition metal heterometallic complexes have been proved to be efficient catalysts to realize syn-selective asymmetric nitro-Mannich reactions (Handa et al 2007).…”