期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 862, 期 -, 页码 13-21出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2018.03.004
关键词
Organometallic Schiff bases; 4-nitrothiophenecarboxaldehyde; Phenylimine bridge; Cyclic voltammetry; Anti-Trypanosoma brucei activity
资金
- FONDECYT-Chile [1150601, 11130443]
- FONDEQUIP [EQM 130154, 120095]
- CONICYT (Chile) [21130293]
- D.I. Pontificia Universidad Catolica de Valparaiso
A novel series of cyrhetrenyl (3a-4a) and ferrocenyl (3b-4b) Schiff bases were synthesized through a condensation reaction, between the known 4-ferrocenylaniline (2b) or the unreported 4-cyhretrenylaniline (2a) with 4-or 5-nitrothiophenecarboxaldehyde. The structure of 2a and the new Schiff bases have been elucidated using conventional spectroscopic techniques (FT-IR, H-1 and C-13 NMR), mass spectrometry, and single-crystal X-ray diffraction analysis of compounds 2a, 4a and 3b. Cyclic voltammetry of organometallic phenylimines derived from 5-nitrothiophene showed NO2 group reduction potentials (E-1/2 approximate to 0.575 V) that were more anodic than those registered for their 4-nitro analogues (E-1/2 approximate to 0.981 V). All organometallic imines were tested against the bloodstream form of Trypanosoma brucei. Evaluation indicated that the most active complexes are the 5-nitrothiophene derivatives, 4a, which were remarkably more active than nifurtimox. In addition, complex 4b resulted in less toxicity to host L-6 cells than nifurtimox. The results revealed that the electronic effects of cyrhetrene and ferrocene are not an influential factor in E-1/2 and anti-Trypanosoma brucei activity for these new imines, which is probably due to the non-coplanarity of the[(eta(5)-C5H4)-C6H4-N=CH-(C4H2S)] system. (C) 2018 Elsevier B.V. All rights reserved.
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