A series of new lanthanide complexes with 2‐bromo‐5‐methoxybenzoic acid and 5, 5′‐dimethyl‐2, 2′‐bipyridine: Crystal structures, thermal behavior, luminescent and magnetic properties. (29th August 2018)

• Record Type: Journal Article
• Authors: Xiao‐Hui, Wu; Ning, Ren; Jian‐Jun, Zhang
• Is Part Of: Applied organometallic chemistry. Volume 32:Number 11(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-08-29
• Subjects: Crystal structure -- Lanthanide complexes -- Luminescence -- Magnetic properties -- Thermal analysis; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.4528
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : Four new binuclear lanthanide complexes [Ln(2‐Br‐5‐MOBA)3 (5, 5′‐DM‐2, 2′‐bipy)]2 (Ln = Gd(1 ), Tb(2 ), Dy(3 ), Er(4 ); 2‐Br‐5‐MOBA = 2‐bromo‐5‐methoxybenzoate; 5, 5′‐DM‐2, 2′‐bipy = 5, 5′‐dimethyl‐2, 2′‐bipyridine) have been successfully synthesized and then further characterized by infrared spectra, single‐crystal X‐ray diffraction, elemental analyses and Powder X‐ray diffraction (PXRD). Complexes1–3 are isostructure with the coordination number of nine, while the complex4 is eight‐coordinated exhibiting a different structure. Nevertheless, the complexes1–4 form the same 1D, 2D and 3D supramolecular structures by hydrogen bonding (C‐H···Br and C‐H···O) and π–π stacking interactions. Thermal behavior of complexes1–4 was studied by TG/DSC‐FTIR techniques. The luminescent spectra of complexes2 and3 were investigated at room temperature, which exhibits characteristic luminescence of Tb 3+ and Dy 3+ ions, respectively. The luminescence decay curve of the complex2 was measured, which follows double‐exponential decay law. The luminescence lifetime of complex2 is 0.693 ms. What's more, the magnetic properties of complexes1–4 have been investigated by measuring the magnetic susceptibility in the temperature range of 2–300 K. Abstract : Complexes1 –3 are isostructural and each metal center is nine‐coordinated, while complex4 is eight‐coordinated exhibiting a different structure. All binuclear units are assembled into 1D, 2D and 3D supramolecular structures via π–π stacking and hydrogen bonding interactions. The luminescent properties were studied, and the lifetime of complex2 is 0.693 ms.