title: Synthesis, structure and enhanced photoluminescence properties of two robust, water stable calcium and magnesium coordination networks.
abstract: Two new 3D coordination networks Ca(cca)·H2O (1) and Mg(cca)·2H2O (2) (H2cca = 4-carboxycinnamic acid) are synthesized by solvothermal reactions and characterized by single crystal and powder X-ray diffraction, thermogravimetric analysis, optical diffuse reflection, photoluminescence spectroscopy, and internal quantum yield measurements. Crystal structure analysis reveals that compound 1 is built from edge-sharing chains of seven-coordinated calcium polyhedra, which are connected by the cca ligand to form a 2D layered structure. Compound 2 contains isolated magnesium polyhedra layers. These layers are linked by cca ligands to complete the 3D connectivity. Both compounds 1 and 2 have high thermal stability and remain intact in aqueous solutions of a broad range of pH values ranging from 3 to 11. Both compounds also show significantly enhanced luminescence with respect to the free ligand, giving rise to an increase in quantum yield by as much as 4-fold.
authors.affiliation: Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, USA. Jingli@rutgers.edu.
authors.forename: Feng
authors.initials: F
authors.lastname: Xu
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Teat
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Qibin
authors.initials: Q
authors.lastname: Xia
authors.forename: Zhong
authors.initials: Z
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Li