Synthesis, crystal structures, thermal properties and bacteriostatic activities

The crystal structures of complexes (Tb (3-Br-4-MBA)3phen)2(1), (Ho(3-Br-4-MBA)3(phen)H2O)2(2) and (Er(3-Br-4-MBA)3(phen)H2O)2(3) (3-Br-4-MBA=3-bro- mine-4-methylbenzoate, phen=1,10-phenanthroline) have been solved by single-crystal X-ray diffraction methods. All obtained products were examined and characterized by ele- mental analysis, molar conductivity, IR, UV and XRD techniques. The thermogravimetric analysis of 1 to 3 was studied, indicating that the decomposition processes of2 and 3 are different from 1. The mass loss of the first step for2 and 3 is attributed to the H2O molecules. The three-dimensional IR accumulation spectra of gaseous of 1 to 3 were also recorded. Complex 1 emits strong and bright green fluores- cence under UV light at the room temperature. The bacte- riostatic activities of the three complexes against bacteria, such as Escherichia coli and Staphylococcus aureus, and fungus (Candida albicans) were tested.