Binuclear Ln (III) complexes: High‐efficiency sensing of acetonitrile/dichloromethane and magnetocaloric effect. (17th December 2020)

• Record Type: Journal Article
• Authors: Li, Juan; Tang, Ji‐Xia; Zou, Hua‐Hong; Mo, Kai‐Qiang; Wen, Chang‐Chun; Liang, Fu‐Pei
• Is Part Of: Applied organometallic chemistry. Volume 35:Number 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-17
• Subjects: binuclear ln (III) complexes -- fluorescence -- magnetocaloric effect (MCE) -- solvothermal reaction -- volatile organic compounds (VOCs); Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.6130
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : At room temperature, 2‐aminomethylpyridine, Ln (NO3 )3 ·6H2 O and ( E )‐2‐((3‐methoxy‐2‐oxidobenzylidene)amino)ethanesulfonate (L 1 ) in methanol and acetonitrile to obtain four complexes: [Ln2 (L )2 (NO3 )4 ] (Ln = Sm (1 ), Eu (2 ), Gd (3 ), Tm (4 ), and L = ( E )‐2‐methoxy‐6‐(((pyridin‐2‐ylmethyl)imino)methyl)phenol). The original organic ligand L 1 and 2‐aminomethylpyridine reacted in situ under the catalyzed condition of Ln III ion to form a new Schiff base ligand L . In the above process, firstly, the C = N double bond in the original Schiff base ligand L 1 is broken and further combines with 2‐aminomethylpyridine to form a new Schiff base ligand L . As far as we know, this is rare in the formation of lanthanide complexes. When Complex 2 was subjected to luminescence test, it was found to have an extremely high selectivity to acetonitrile (CH3 CN) and methylene chloride (CH2 Cl2 ). Therefore, after screening a variety of different organic solvents, here we explore a method that can quickly and efficiently respond to CH3 CN/CH2 Cl2 . In addition, we can visually distinguish the response of Complex 2 to multiple volatile organic compounds (VOCs). The magnetocaloric effect (MCE) test of Complex 3 showed 18.7 J·kg −1 ·K −1 at 2 K for Δ H = 5 T. Abstract : The example of quick, easy, and selective identification of CH3 CN/CH2 Cl2 is realized by using Complex 2 as fluorescence probe. Magnetic studies indicated that 3 displays large changes in entropy with changing magnetic field.