Crystal structure, optical properties, and antibacterial activity of rare earth complexes with designed 2-carbonyl propionic acid-4-nitro benzoyl hydrazone

In this dissertation, based on the designed 2-carbonyl propionic acid-4-nitro benzoyl hydrazone (PANH), two novel lanthanide complexes are prepared, namely, [Y(PANH)(3)]center dot 3H(2)O (1) and [Er(PANH)(3)]center dot(CH3OH)center dot(H2O) (2). Their crystal structures are determined by single crystal X-ray diffraction and further characterized by thermogravimetric analyses (TGA) and infrared spectrum (IR). Structural analyses of 1 and 2 showed that they are all 3D supramolecular networks consisting of zero-dimensional mononuclear structures connected by hydrogen bonds. Interestingly, the stacking structure of 1 contains narrow 1D channels with a opening of 5.49 angstrom x 6.41 angstrom along the c axis. The optical properties are studied by ultraviolet spectrum and fluorescence spectra. Moreover, Fusarium solani was selected as representative to explore the antibacterial activity of the PANH ligand and the lanthanide complexes. Experimental results show that both PANH ligand and two lanthanide complexes had excellent inhibiting effect on F. solani, and the complexes are obviously more effective in suppressing F. solani than the ligand. (C) 2019 Elsevier Ltd. All rights reserved.