Synthesis, Structure, Luminescence Properties of Alkaline Earth Metal Calcium Complex With Maleic Anhydride Ligand and a New Precursor to Produce Pure Phase Micro-Sized Calcite Particles

摘要

The title complex [Ca-2(ma)(2)(H2O)(2)] (1), where ma(2-) is maleate anion, was obtained by reaction of maleic anhydride ligand and CaCO3 under hydrothemal process. Its structure was determined by single-crystal X-ray diffraction analyses, and further characterized by elemental analyses and IR spectra. Complex 1 is three-dimensional network structure, in which the Ca(II) center takes seven-coordinated distorted pentgonal bipyramidal geometry. Each ma(2-) anion acts as a (4)-bridge ligand to form 3D framework, in which one carboxylate group adopts a (3)-(2):(2) fashion, while the other takes a (2)-(1):(1) coordinating model. Its solid-state fluorescent property was investigated in this paper. Furthermore, we describe a simple method for the production of micro-crystalline calcite CaCO3 particles based on direct calcination of complex 1 as a precursor at moderately elevated temperature.