Transition metal phosphonates with pyridyl-based phosphonic acids: synthesis, characterization and luminescence properties

摘要

Two transiton metal phosphonates, Cd-2[OOCC5H3NPO3H](2)center dot H2O (1) and Zn[OOCC5H4NPO3]center dot H2O (2), were synthesized by hydrothermal reactions. Single-crystal X-ray diffraction analyses show that both have a 3-D framework. In 1, the asymmetric [Cd-NO5] octahedron is connected to the [P-CO3] tetrahedron through corner sharing and two neighboring [Cd-NO5] octahedra are bridged via a mutual plane [O1-O2-O3]. Compound 2 has a scales-like multilayer structure viewing from b and c. [Zn-O-4] tetrahedra linked [P-CO3] tetrahedra through corner O sharing. The thermogravimetric properties and luminescence spectra of 1 and 2 were investigated. Compound 2 emitted a purple-blue light upon 323 nm excitation. Above 100 nm, red shifts in both compounds make them candidates for luminescent materials.