Barium−phosphonate coordination layers: Syntheses, crystal structures, and luminescent properties

Publication date: Available online 27 September 2018Source: Journal of Solid State ChemistryAuthor(s): Hui-Ling Sung, Tze-Min Her, Chong-You Chen, Yu-Wei Xie, Ya-Chu ChangAbstractCompounds {[Ba3(tpmm)(H2O)15]·5H2O}n (1) and {[Ba6(tpmm)2(H2O)22]·15H2O}n (2) were obtained through reactants slowly diffusion of barium acetate (Ba(CH3COO)2) and 2,4,6-tris(phosphorylmethyl)mesitylene (H6tpmm) at room temperature in H2O/THF/MeOH media without and with the addition of pyrazine (pz), respectively. Single-crystal X-ray structure analysis shows that compound 1 features a two-dimensional (2D) layer structure, with an I1O1 connectivity, in which the one-dimensional (1D) inorganic Ba−O−Ba double-stranded ribbon-like chains are cross-linked by the cis,cis,cis-configured μ3-tpmm6− anions. Compound 2 has also a 2D layer structure but with an I2O0 connectivity, in which the 2D inorganic Ba−O−Ba layer is capped by the cis,cis,cis-configured μ4- and μ3-tpmm6− anions. Of interest, in 2 there are significant cation−π interactions between the Ba2+ ion and the phenyl core of the μ4-tpmm6− anion. Compounds 1 and 2 both display a high thermal stability approaching to 402 °C and 545 °C, respectively, and emit three ligand-based emission bands in the solid-state at room temperature.Graphical abstractThe synthesis and structures of two barium−phosphonate coordination layers with respectively 1D inorganic Ba−O−Ba double-stranded ribbon-like chains (I1O1 connectivit...

Source: Journal of Solid State Chemistry - October 5, 2018 Category: Chemistry Source Type: research