Anionic lanthanide metal-organic frameworks with magnetic, fluorescence, and proton conductivity properties and selective adsorption of a cationic dye

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 51; no. 41; pp. 15762 - 1577
• Main Authors: Zhang, Xiao-Nuan, Chen, Bo-Chen, Zhang, Jia-Li, Zhang, Jia-Lin, Liu, Sui-Jun, Wen, He-Rui
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 25.10.2022
• Subjects: Cationic dyes; Dysprosium; Fluorescence; Gadolinium; Magnetic induction; Magnetic properties; Magnetic relaxation; Metal-organic frameworks; Protons; Rhodamine; Selective adsorption; Topology
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d2dt02347d

Two novel microporous anionic lanthanide metal-organic frameworks (Ln-MOFs), namely {[(CH 3 ) 2 NH 2 ][Ln(bptc)]·2H 2 O} n (Ln = Gd ( 1 ) and Dy ( 2 ), H 4 bptc = biphenyl-3,3′,5,5′-tetracarboxylic acid) with a new 4,8-connected topology have been synthesized and structurally characterized. Ln-MOF 1 shows a significant magnetocaloric effect with −Δ S max m = 26.37 J kg −1 K −1 at 2 K for Δ H = 7 T, and a high proton conductivity of 1.02 × 10 −4 S cm −1 at 323 K and 90% RH. Moreover, Ln-MOF 1 shows specific selective adsorption of the cationic dye Rhodamine B. Ln-MOF 2 exhibits field-induced slow magnetic relaxation with an energy barrier ( U eff ) of 48.19 K, characteristic emission of Dy 3+ , and selective adsorption of Rhodamine B. Therefore, 2 is a multifunctional Ln-MOF with magnetic, fluorescence and selective adsorption properties. Two novel anionic lanthanide metal-organic framework materials showed magnetic and proton conductivity properties and specific adsorption of RhB, which could be considered as multifunctional molecular materials.