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Advances in Biological Chemistry 2020年第3期10卷 67-85页

作者： Temitayo O. Aiyelabola Iyanuoluwa E. Okunade Johan H. L. Jordaan Daniel P. Otto Department of Chemistry Obafemi Awolowo University Ile-Ife Osun State Nigeria Research Focus Area for Chemical Resource Beneficiation Laboratory for Analytical Services North-West University Potchefstroom South Africa

Coordination compounds of 2-amino-3-methylbutanoic acid were synthesized with chromium(III) and oxovanadium(IV) ions. M:L;1:2. Adducts of these complexes using 1,10-phenantroline and ethylenediamine were further synthesized, M:L, (1:2). These compounds were characterized using electronic, infra-red spectrophotometry, magnetic susceptibility measurement and percentage metal analyses. The zones of inhibition and minimum inhibitory concentrations of the compounds against eight microbes were studied. The results obtained indicated an octahedral geometry for the Cr(III) complexes, indicative of additional coordination of two water molecules. On the other hand a square pyramid geometry was obtained for the binary oxovanadium complex and its 1,10-phenantroline adduct. However, for the oxovanadium ethylenediamine adduct a distorted octahedral geometry was proposed. The result for the antibacterial studies indicated that both mixed ligand complexes of 1,10-phenantroline exhibited good antibacterial activity, and in some cases better activity than the standard, streptomycin.

关键词： Coordination Compounds 2-Amino-3-Methylbutanoic Acid Mixed Ligand Complexes Minimum Inhibitory Concentration 1 10-phenantroline Ethylenediamine

Determination of Manganese in Tap Water by a New Extraction-Photometric Method

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American Journal of Analytical Chemistry 2014年第4期5卷 275-280页

作者： N. Kh. Rustamov G. G. Abbasova ANAS Institute of Chemical Problems Named after Acad. M.F.Nagiyev Baki Azerbaijan

The heteroligand complex of manganese with 1,10-phenantroline and o-nitrobenzolazosalicylic acid has been investigated by spectrophotometric method. The condition of complexing and extraction, physical-chemical and analytical characteristics of this complex have been found. Complex formation is observed in the pH range 5 - 11. Extraction constant was found as 5.3 × 1012, stability constant was found as lgβK = 9.03?± 0.03. Molar absorptivity is ε = (1.36 ± 0.08) × 104 l·g﹣1·cm﹣1. Beer's law is obeyed in the range of 1.0 - 22.5 μkg manganese (II). The extraction-photometric methods of manganese determination have been worked out. The influence of diverse ions on determination of manganese (II) has been studied. The proposed method was applied successfully to determine amount of manganese in tap water.

关键词： Water Extraction-Photometric Determination Complexing Manganese 1 10-phenantroline Chromogenic Organic Reagent

Alizarine Yellow R as Reagent of the Determination of Manganese by Extraction-Photometric Method

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Journal of Materials Science and Chemical Engineering 2018年第10期6卷 12-18页

作者： G. G. Abbasova A. M. Pashajanov ANAS Institute of Catalysis and Inorganic Chemistry Named after Acad. M. Naghiyev Baki Azerbaijan

4,7-diphenyl-1,10-phenantroline from heterocyclic diamines and alizarine yellow R from chromogenic reagents have been used for spectrophotometric determination of manganese in the form of heteroligand manganese complex. The complex formation and extraction condition, physical-chemical and analytical characteristics of this complex have been established. 5.5 - 11.0 pH range is observed as complex formation pH range. Extraction and stability constants were accordingly found as Kext = 8.32 × 1014 and lgβK = 7.2 ± 0.1. Molar absorptivity is ε = (2.27± 0.08) × 104 l·g-1·cm-1. In the range of 0.5 - 23.0 μkg manganese (II) Beer’s law is obeyed. The extraction-photometric methods of manganese determination have been worked out. The strangers ions influence on determination of manganese (II) has been studied. To determine amount of manganese in eggplant the proposed method was applied successfully.

关键词： Extraction-Photometric Determination Complexing Manganese 4 7-Diphenyl-1 10-phenantroline Alizarine Yellow R

Syntheses of Coordination Compounds of (±)-2-Amino-3-(4-Hydroxyphenyl)Propionic Acid, Mixed Ligand Complexes and Their Biological Activities

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Advances in Biological Chemistry 2020年第2期10卷 25-42页

作者： Temitayo O. Aiyelabola Ezekiel O. Akinkunmi Raphael Akinade Department of Chemistry Obafemi Awolowo University Ile-Ife Osun State Nigeria

Coordination compounds of (±)-2-amino-3-(4-hydroxyphenyl) propionic acid and their mixed ligand complexes with 1,10-phenantroline were synthesized, characterized using electronic and infrared spectral analyses and magnetic susceptibility. The compounds were evaluated for antimicrobial and antioxidant activities. Four different assays were applied for evaluating antioxidant capacity of the compounds. The results obtained indicated a diametric square planar geometry for both cobalt (±)-2-amino-3-(4-hydroxyphenyl) propionic acid complex and its mixed ligand complex. It was suggested that for the binary cobalt(II) complex, the phenolic substituent coordinated with neighbouring central metal ions. However, for the ternary cobalt(II) complex it was suggested it was deprotonated. Octahedral geometry was proposed for both copper complexes. Square planar geometry was indicated for the nickel?(±)-2-amino-3-(4-hydroxyphenyl) propionic acid complex and a mixture of square planar and octahedral geometry for the nickel mixed ligand complex. The cobalt mixed ligand complex elicited the highest activity for all the antioxidant assays. In most cases the binary complexes exhibited better antimicrobial activities relative to their ternary counterparts.

关键词： Coordination Compounds Antimicrobial Agent Antioxidant Mixed Lig-and 1 10-phenantroline