title: Systematic study on the structures of salen type lanthanide complexes tuned by lanthanide contraction and corresponding luminescence.
abstract: Two types of N,N'-bis(salicylidene)-1,3-propanediamine (H2L) lanthanide complexes, viz. [Ln(NO3)3(H2L)2]·0.2CH3OH [Ln = La (1), Ce (2) and Pr (3)] and [Ln(NO3)3(H2L)2]2·CH2Cl2·CH3OH [Ln = Nd (4), Sm (5), Eu (6), Gd (7), Tb (8) and Yb (9)], have been isolated by reactions of H2L with Ln(NO3)3·6H2O. X-ray crystallographic and PXRD analysis reveal that 1-3 are isomorphic possessing a novel one-dimensional (1D) ladder-like double-chain structure. Complexes 4-9 are isostructural exhibiting a discrete dinuclear structure. Luminescent analysis reveals the lanthanide ion and ligand-centered co-luminescence for 5, 6 and 8, which are attributed to the incomplete energy transfer from the triplet state of H2L to the resonance energy level of the corresponding Ln(iii) ion. Further, the characteristic near infrared (NIR) luminescence of Nd(iii) and Yb(iii) ions for complexes 4 and 9 have been revealed.
authors: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China.
authors: Xiaoyan
authors: X
authors: Zou
authors: Mingjie
authors: M
authors: Li
authors: Pengfei
authors: P
authors: Yan
authors: Juwen
authors: J
authors: Zhang
authors: Guangfeng
authors: G
authors: Hou
authors: Guangming
authors: G
authors: Li
mesh_terms: D005029:Ethylenediamines / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D005029:Ethylenediamines; D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; C011452:disalicylaldehyde ethylenediamine