title: A Zn(II) coordination polymer and its photocycloaddition product: syntheses, structures, selective luminescence sensing of iron(III) ions and selective absorption of dyes.
abstract: One coordination polymer [Zn2(L)2(bpe)2(H2O)2] (1) (L = 4,4'-((1,2-phenylenebis(methylene))bis(oxy))dibenzoic acid; bpe = (E)-1,2-di(pyridin-4-yl)ethene) was prepared and structurally determined. Compound 1 has a chain structure in which its pair of bpe ligands is arranged in a head-to-tail manner with their C=C bonds being close enough for a [2 + 2] cycloaddition reaction. Upon exposure to UV light, compound 1 undergoes a single-crystal-to-single-crystal (SCSC) [2 + 2] photodimerization to generate one 2D coordination polymer [Zn(L)(rctt-tpcb)0.5(H2O)] (1a) (rctt (regio cis, trans, trans)-tpcb = tetrakis(4-pyridyl)cyclobutane). The tpcb ligands in the crystals of 1a show an intriguing in situ thermal isomerisation. The nanospheres of 1 can be obtained by recrystallization in DMSO/alcohol. The nanospheres of 1a can also be readily produced from the corresponding nanospheres of 1 by the photocyclodimerization method. Compared with those of 1a, the nanospheres of 1 display highly selective sensing of Fe(3+) ions over mixed metal ions through fluorescence quenching. Moreover, the nanospheres of 1a can rapidly adsorb CR (congo red), MB (methylene blue) or RhB (rhodamine B) over MO (methyl orange) from aqueous solutions. This work offers a new photoinduced post-synthetic method for the synthesis of multifunctional MOFs, which show luminescence sensing of Fe(3+) ions and dye adsorption properties.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. jplang@suda.edu.cn and Guangxi Colleges and Universities Program of Innovative Research Team and Outstanding Talent, College of Chemistry and Material, Yulin Normal University, Yulin 537000, P. R. China.
authors.forename: Fei-long
authors.initials: FL
authors.lastname: Hu
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. jplang@suda.edu.cn.
authors.forename: Yi-Xiang
authors.initials: YX
authors.lastname: Shi
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. jplang@suda.edu.cn.
authors.forename: Huan-Huan
authors.initials: HH
authors.lastname: Chen
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. jplang@suda.edu.cn.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Lang
mesh_terms: D065966:Absorption, Physicochemical; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003500:Cyclization; D005290:Ferric Compounds / Q000032:analysis*; D007477:Ions / Q000032:analysis; D049449:Luminescence; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D055668:Photochemical Processes; D011108:Polymers / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D005290:Ferric Compounds; D007477:Ions; D049408:Luminescent Agents; D011108:Polymers; D015032:Zinc