title: A series of rare earth complexes with novel non-interpenetrating 3D networks: synthesis, structures, magnetic and optical properties.
abstract: A series of metal-organic framework {Ln(BCPBA)(H2O)}n {Ln = Nd (1), Sm (2), Eu (3), Tb (4), Dy (5)}; {[Ln(BCPBA)(H2O)](H2O)}n {Ln = Pr (6), Gd (7)} have been synthesized through the hydrothermal synthesis method. These compounds possess non-interpenetrating 3D networks with 10.1438 Å× 17.9149 Å rhombic channels along the [001] direction. The results of temperature-dependent magnetic susceptibility measurements indicate that compounds 4 and 7 exhibit Ln(III)Ln(III) antiferromagnetic interactions, while compound 5 exhibits Ln(III)Ln(III) ferromagnetic interactions. Frequency dependent out-of-phase signals were observed in alternating current (ac) magnetic susceptibility measurements which indicate that they have slow magnetic relaxation characteristics. The luminescent properties of 1, 2, 3, 4, and 5 are also discussed. Due to the good match between the lowest triplet state of the ligand and the resonant energy level of the lanthanide ion, compound 4 has longer fluorescence lifetime (τ1 = 400.0000 ms, τ2 = 1143.469 ms) and higher quantum yield (Φ = 42%) compared with other compounds.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Wei
authors.forename: Lin-Yan
authors.initials: LY
authors.lastname: Yang
authors.forename: Sheng-Yun
authors.initials: SY
authors.lastname: Liao
authors.forename: Ming
authors.initials: M
authors.lastname: Zhang
authors.forename: Jin-Lei
authors.initials: JL
authors.lastname: Tian
authors.forename: Pei-Yao
authors.initials: PY
authors.lastname: Du
authors.forename: Wen
authors.initials: W
authors.lastname: Gu
authors.forename: Xin
authors.initials: X
authors.lastname: Liu