title: Long-lived luminescent soft materials of hexanitratosamarate(III) complexes with orange visible emission.
abstract: Sm(III)-based ionic liquids incorporating hexanitratosamarate(III) anions were obtained and fully characterized as novel Sm(III)-containing organic complexes. The structure of the ionic liquids was determined by single-crystal X-ray diffraction (1: monoclinic system C2/c space group with cell parameters: a = 19.5624(4) Å, b = 10.11895(18) Å, c = 33.2256(6) Å, β = 101.2912(18)°, Z = 8). The central Sm(III) ion is 12-coordinated by six bidentate nitrate ligands with twelve oxygen donors to form a [Sm(NO3)6](3-) anion. The low melting point, high thermostability and wide liquid range of these ionic liquids were determined in detail. All the complexes 1-5 display orange luminescence, rather than red luminescence as in most Sm(III)-containing organic complexes. Three characteristic monochromatic bands and an intense emission, derived from (4)G5/2→(6)HJ (J = 5/2, 7/2, and 9/2) intraconfigurational f-f transitions, were revealed. All these complexes exhibit long luminescence lifetimes.
authors: College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China. lhe@scu.edu.cn taogh@scu.edu.cn.
authors: Ning
authors: N
authors: Tang
authors: Ying
authors: Y
authors: Zhao
authors: Ling
authors: L
authors: He
authors: Wen-Li
authors: WL
authors: Yuan
authors: Guo-Hong
authors: GH
authors: Tao
mesh_terms: D018360:Crystallography, X-Ray; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D012493:Samarium