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Modification on Synthesis of Mixed Ligand Chelates by Using Di- and Trivalent Transition Metal Ions with Schiff Base as Primary Ligand

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Green and Sustainable Chemistry 2014年第3期4卷 103-110页

作者： Abdussalam Ali Maihub Faten Suliman Alassbaly marei mailoud el-ajaily Abdunnaser Mohamed Etorki Chemistry Department Faculty of Science Benghazi University Benghazi Libya Chemistry Department Faculty of Science Tripoli University Tripoli Libya

New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand, whereas 2-nitroaniline (L2) represents the secondary ligand in a molar ratio of M:L1:L2 [1:1:1]. The synthesized Schiff base and chelates have been characterized by using several tools, such as, elemental analysis, molar conductivity, magnetic moment measurements, infrared and electronic spectra. The mass spectra of the ligands and Ni(II) chelate were used to justify the process of modification, as well as, the electron paramagnetic resonance spectrum which was carried out for Cu(II) chelate all in order to elucidate the chemical and geometrical structure of the chelates. On the basis of the obtained data, the geometry of the products was proposed for all the chelates.

关键词： Schiff Base 2-Nitroaniline Chelates 4-Dimethylaminobenzaaldehyde 2-Aminophenol Physiochemical Techniques

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Antimicrobial Agents from Selected Medicinal Plants in Libya

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Chinese Journal of Integrative Medicine 2016年第3期22卷 177-184页

作者： Hasan MH Muhaisen Miftah mailoud Ab-Mous Fadel A Ddeeb Aboclaid All Rtemi Omer M Taba Mehtab Parveen Faculty of Science and Arts Sharora University of Najran Saudi Arabia Faculty of Science University of Al-Jabal AI- Gharbi EI-Zintan- Libya Department of Chemistry Aligarh Muslim University Aligarh 202002 India

Objective： To test the in vitro antimicrobial efficacy of water and methanol extracts of 23 plant species that are commonly used in Libyan folk medicine. Methods： The antimicrobial activity was determined using the well-diffusion method. Four test microorganisms were used namely, Escherichia coil, Salmonella species, Staphylococcus aureus and Bacillus subtilis. The minimum inhibitory concentration （MIC） was determined for the high biologically active crude plant extracts. Results： Among 23 medicinal plants used in the study, only 5 methanolic extracts [Rosmarinus offcinalis L., Carduus marianium L., Lantana camara L., Rhus tripartite （ueria） Grande, and Thymus capitatus （L.） Hoffm （link）] showed the highest antimicrobial activity against Staphylococcus aureus, Bacillus subtilis and Salmonella species, while 22 methanolic and aqueous extracts showed moderate to weak antimicrobial activity on all tested organisms. However 19 of the extracts showed no activity at all against Gram -ve and Gram ＋ve microorganisms. MIC was found to be 1.25 mg/mL （Thymus capitatus）, 3 mg/mL （Rhus tripartite）, 4 mg/mL （Carduus marianium）, 5 mg/mL （Rosamarinus officinalis） and 5 mg/mL （Lantana camara）, respectively. Condusions： The present results revealed that, crude methanolic extracts of the investigated Libyan folk medicinal plants exhibited mild to high in vitro antibactedal activities against Gram-positive and Gram-negative microorganisms.

关键词： medicinal plant extracts antimicrobial activity minimum inhibitory concentration Ubyan folk medicine

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