Synthesis, structure and near-infrared photoluminescence of hexanitratoneodymate ionic liquids. Issue 5 (23rd December 2014)

• Record Type: Journal Article
• Authors: He, Ling; Ji, Shun-Ping; Tang, Ning; Zhao, Ying; Tao, Guo-Hong
• Is Part Of: Dalton transactions. Volume 44:Issue 5(2015)
• Page Start: 2325
• Page End: 2332
• Publication Date: 2014-12-23
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c4dt03294b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Novel water-free lanthanide ionic liquids, with high-symmetry 12-coordinated hexanitratoneodymate, are of interest as potential near-infrared (NIR) luminescent soft materials. Abstract : Five hexanitratoneodymate-based rare earth complexes (1–5 ) were synthesized using a straightforward method. Purple plate crystals of1 were isolated and the crystal structure was determined by single-crystal X-ray diffraction with respect to the coordination mode of the nitrate anion to the central Nd(iii ) ion. (1 : monoclinic system P 21 / c, a = 15.9460(3) Å, b = 10.2457(6) Å, c = 33.323(3) Å, β = 91.8108(17)°, V = 3109.11(11) Å 3, Z = 4). The central Nd(iii ) ion is surrounded by six bidentate nitrate ligands, with a major trend towards high symmetry of the [Nd(NO3 )6 ] 3− anion as an icosahedron. Thermal properties were determined from differential scanning calorimetry (DSC) combined with thermogravimetric analysis (TGA) tests. Complexes3–5 are found to be room temperature liquids, and their excitation and emission spectra were recorded. These complexes exhibit intense near-infrared (NIR) luminescence emission, which originates from interconfigurational f–f transitions 4 F3/2 → 4 I J multiplet ( J = 9/2–13/2). These liquid Nd(iii ) complexes are of interest as potential NIR luminescent soft materials with high thermal stability.