A series of binuclear lanthanide(III) complexes: Crystallography, antimicrobial activity and thermochemistry properties studies

• Published in: Journal of molecular structure Vol. 1081; pp. 413 - 425
• Main Authors: Zhang, Ying-Ying, Ren, Ning, Xu, Su-Ling, Zhang, Jian-Jun, Zhang, Da-Hai
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.02.2015
• Subjects: Antiinfectives and antibacterials; Antimicrobial activity; Candida albicans; Coupled TG/DSC-FTIR; Crystal structure; Escherichia coli; Heat capacities; Lanthanide complexes; Lanthanides; Mathematical analysis; Molecular structure; Nitrogen atoms; Polynomials; Staphylococcus aureus; Thermal decomposition; Thermodynamic functions; Antimicrobial activity; Heat capacities; Thermodynamic functions; Lanthanide complexes; Crystal structure; Coupled TG/DSC-FTIR
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2014.10.057

[Display omitted] •Eight novel lanthanide complexes were synthesized and characterized.•The eight complexes are isomorphous.•The heat capacities of the complexes were measured by DSC.•The thermodynamic parameters were also obtained.•The thermal properties were investigated by simultaneous TG/DSC-FTIR techniques. A series of novel lanthanide complexes with the general formula [Ln(3,4-DClBA)3phen]2 (Ln=Ho(1), Nd(2), Sm(3), Dy(4), Eu(5), Tb(6), Yb(7) and Er(8), 3,4-DClBA=3,4-dichlorobenzoate, phen=1,10-phenanthroline) were prepared at room temperature and characterized. The crystal structures of complexes 1–8 have been determined by single crystal X-ray diffraction. These complexes are isomorphous and lanthanide ions are all eight-coordinated to oxygen atoms and nitrogen atoms with distorted square-antiprism geometry. The thermal decomposition mechanism and TG-FTIR spectra of gaseous products of thermal decomposition processes for complexes 1–8 were acquired through TG/DSC-FTIR system. The heat capacities of complexes 1–8 were measured using DSC technology and fitted to a polynomial equation by the least-squares method. Complexes 3–6 display characteristic lanthanide emission bands in the visible region. Meanwhile, these complexes exhibit in good antimicrobial activity against Candida albicans, Escherichia coli, and Staphylococcus aureu.