Lanthanide complexes with 3-bromine-4-methyl benzoic acid and 1,10-phenanthroline

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-bromine-4-methylbenzoate, phen=1,10-phenanthroline) have been solved by single-crystal X-ray diffraction methods. All obtained products were examined and characterized by elemental analysis, molar conductivity, IR, UV and XRD techniques. The thermogravimetric analysis of 1 to 3 was studied, indicating that the decomposition processes of 2 and 3 are different from 1. The mass loss of the first step for 2 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 fluorescence under UV light at the room temperature. The bacteriostatic activities of the three complexes against bacteria, such as Escherichia coli and Staphylococcus aureus, and fungus (Candida albicans) were tested.