title: A promising Mg(II)-ion-selective luminescent probe: structures and properties of Dy-Mn polymers with high symmetry.
abstract: Two Dy-Mn polymers, {[Dy(L1)3Mn(1.5)(H2O)3]3.125H2O}n (1, L1 = pyridine-2,6-dicarboxylic acid) and {[Dy(L2)3Mn(1.5)(H2O)6]8.25H2O}n (2, L2 = 4-hydroxylpyridine-2,6-dicarboxylic acid), with high symmetry (S6) have been prepared. Polymer 1 has a nanoporous 3D framework with channel of about 17.6 A diameter, while 2 has a honeycomb-type 2D structure with the cavity of approximately 14.4 A diameter. In the construction of multidimensional porous polymers with 3d-4f mixed metals, it is the first observation that a ligand substituent effect leads to dramatic differences in the structures formed. Luminescent studies reveal that the emission intensities of 1 and 2 increase significantly upon the addition of Mg2+, whereas the introduction of other metal ions leaves the intensity unchanged or even weakens it; hence, both of them may serve as good candidates of Mg2+ luminescent probes. To our knowledge, complex 1 is also the first example of a 3d-4f metal-based nanoporous polymer to exhibit luminescent selectivity for Mg2+. Magnetic susceptibility measurements reveal a rather rare ferromagnetic interaction in 2. Thermal gravimetric analyses and powder X-ray diffraction investigations have also been performed, suggestive of high thermal stability of 1.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, P. R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
authors.forename: Hong-Ling
authors.initials: HL
authors.lastname: Gao
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Chen
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Dai-Zheng
authors.initials: DZ
authors.lastname: Liao
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan
authors.forename: Zong-Hui
authors.initials: ZH
authors.lastname: Jiang