Crystal Structure and Antimicrobial Properties of Rare Earths Aryl-acylhydrazone Complexes under Microwave Irradiation

2-Carbonyl propionic acid-4-methyl benzoyl hydrazone(PAMH) has been synthesized by using 4-methyl benzoyl hydrazine and pyruvic acid as the chemicals and acetic acid as phase transfer catalyst under microwave radiation. Then the PAMH and Tb Cl3·6 H2 O are placed in the methanol/acetone/water(3:2:4) mixture for coordination reaction, getting the Schiff complex Tb(PAMH)3. The crystal structure is characterized by elemental analysis, X-ray Diffraction(XRD) and infrared spectrum. The compound crystallizes in the monoclinic space group P21/n, with a = 1.4770(4), b = 1.2864(3), c = 1.9287(5) nm, β = 92.06(3)o, V = 3.6623(15) nm3 and Z = 4. Tb(III) ion is nona-coordinated by three completely deprotonated PAMH ligands in a tricapped trigonal prism geometry, leaving a zero-dimensional mononuclear configuration. The optical properties and thermal stability are studied by ultraviolet spectrum, fluorescence spectra and thermogravimetric analysis(TGA). The antibacterial activities of the ligand and rare-earth complex are preliminarily studied, and found they have certain antibacterial activity on fusarium solani, and the complex is obviously more effective in suppressing fusarium solani than the ligand.