Open Access Case study

Unusual Effects of Intramolecular Hydrogen Bonds and Dipole Interaction on FTIR and NMR of Some Imines

Elham Abdalrahem Bin Selim, Mohammed Hadi Al–Douh

Asian Journal of Applied Chemistry Research, Page 1-6
DOI: 10.9734/ajacr/2019/v3i330096

Unusual effects of intramolecular hydrogen bonds and dipole interactions are investigated using FTIR, NMR and X-Ray crystallography analyses of some imines. These phenomena affect both FTIR absorptions and chemical shifts.

Open Access Original Research Article

Adsorption of Cr6+ Onto Unmodified and Hydrochloric Acid Modified African Nutmeg Pod (Monodora myristica) from Aqueous Solution

F. U. Okwunodulu, H. O. Chukwuemeka-Okorie, N. M. Mgbemena, J. B. I. Kalu

Asian Journal of Applied Chemistry Research, Page 1-8
DOI: 10.9734/ajacr/2019/v3i330091

The removal of Cr6+ from aqueous solution using unmodified and hydrochloric modified African nutmeg pod was studied. The effects of particle size, pH and initial metal ions concentration adsorbed were investigated. The amount of metal ion adsorbed increased as the initial metal ion concentration increased and also decreased at low pH of 2 for both modified and unmodified African nutmeg pod.  400 µm and 250 µm were the optimum particle sizes for both modified and unmodified African nutmeg pod respectively, values given as 75.8 mg/g for the modified and 93.39 mg/g for the unmodified. Generally, it was observed that the unmodified African nutmeg pod showed greater adsorption capacity than the modified African nutmeg pod. The equilibrium experimental data were examined via Langmuir and Freundlich isotherm models.  Freundlich isotherm model gave the best fit for the data in both unmodified and modified African nutmeg pod based on the correlation coefficients (R2 values) gotten. The results of the study showed that the African nutmeg pod is efficient for the removal of Cr6+ from aqueous solutions especially when unmodified.

Open Access Original Research Article

Synthesis Spectroscopy and Computational Studies of Manganese (II) Complexes Incorporating (N,O)(O,O`) Ligands and Their Biological Activity

Rania Ahmad Abokhater, Salem Eltuhami Ashoor, Suad A. Gadir

Asian Journal of Applied Chemistry Research, Page 1-10
DOI: 10.9734/ajacr/2019/v3i330092

Manganese (II) complexes were synthesized via the reaction equimolar quantity of Manganese(II) chloride-hydrate (MnCl2.6H2O) with Chiral saccharides such {(OH)5(CH2)(C5H5)O} or {(OH)6(CH2)(C5H5)O} and (C9H7NO) as secondary ligands [Mn(C9H7NO){(OH)5(CH2)(C5H5)O}]Cl2 (C1), [Mn(QH){(OH)6(CH2)(C5H5)O}]Cl2 (C2), respectively where (C9H7NO) is 8-hydroxyquinoline, {(OH)5(CH2)(C5H5)O} Dextrose (Dex), {(OH)6(CH2)(C5H5)O} fructose (fru). Theses complexes were characterized by UV-vis, IR spectroscopy, tandem mass spectrometry and elemental analysis.

The complexes have been found to have square planer geometry as the optimization method. The molecular geometries obtained from XRD data.

The pre-optimized to standard convergence criteria using the basis Minimize Energy to Minimum.

The isolated compounds were screened for its antibacterial activity against six standard human pathogens (Staphylococcus aureus, Streptococcus spp., Escherichia coli, Klebsiella spp., Psuedomones spp. and Protues spp.) and the results were obtained. About 10 to 70% for complex (C1) and about 10 to 60% for complex (C2) of the activity.

Open Access Original Research Article

Structural Elucidation, 3D Molecular Modeling and Antibacterial Activity of Ni (II), Co (II), Cu (II) and Mn (II) Complexes Containing Salophen Ligand

Md. Ali Asraf, Md. Mahbubur Rahman, D. C. Kabiraz, Rezaul H. Ansary, Md. Faruk Hossen, Md. Fazlul Haque, C. M. Zakaria

Asian Journal of Applied Chemistry Research, Page 1-15
DOI: 10.9734/ajacr/2019/v3i330093

The salophen ligand and its complexes of Ni(II), Co(II), Cu(II), and Mn(II) are explored in terms of synthesis, conductivity; magnetic measurements, elemental analysis, FT-IR; electronic spectra, and antibacterial activities. The 3D molecular modeling structures of the ligand and its metal complexes are obtained by using Argus lab software. The experimental data shows that the ligand is tetradentate and bonded to the metal ion via N2O2 donor atoms. Antibacterial activity of the synthesized compounds are checked against the microbes Bacillus cereus and Escherichia coli. The metal complexes exhibit antibacterial activity higher than that of the free ligand. This works contributes to the science of Schiff base compounds, in addition to stimulating the synthesis of new ligands and its complexes for the future advancement of coordination chemistry.

Open Access Original Research Article

Physicochemical Parameters and Toxic Heavy Metals Concentration in Coffee

Eltigani Osman Musa Omer, Osama Ahmed Labib, Mubashir Zafar

Asian Journal of Applied Chemistry Research, Page 1-8
DOI: 10.9734/ajacr/2019/v3i330094

Background and Objective: Coffee is one of the common drinks in Middle Eastern countries including Saudi Arabia due to its desirable aroma, taste and putative positive physiological functions. The concentration of metals is commonly present in coffee powder. The presence of heavy metal concentration in different brands of coffee powder available in Saudi Arabia market has been analyzed.

Methods: Thirteen different coffee brands were selected in different markets, all assessment was carried out in advanced instruments such as Inductively Coupled Plasma and Atomic Absorption Spectroscopy. There are 14 metals which divide into seven non toxic and seven toxic metals were analyzed. Non toxic metals are calcium (Ca), iron (Fe),magnesium (Mg), Magnese (Mn), Potassium (K), phosphorus (P), sodium (Na), and toxic metals are arsenic (Ar), zinc (Zn), chromium (Cr), nickel (Ni), lead (Pb), antimony and cadmium (Cd).

Results: The mean and standard deviation of non-toxic and toxic metals concentration in different samples of coffee were as follows: Ca, Fe, K, Mg, Mn, P and Na were 24.87±6.76, 6.670±4.88, 235.98±100.05, 407.02±22.56, 8.63±10.14, 0.01±0.01, 333.86±247.35 respectively. Toxic metals concentration were as Al, Cd, Cu, Ni, Pb, Si, Zn were   11.04±10.03, 0.80 ±2.52, 2.43±3.02, 0.07±0.11, 7.57±9.26,  23.48±27.32  and 1.853±1.66 respectively. These concentration values were high compared to threshold limit values (TLVs) of metals.

Conclusion: It was concluded from the study that coffee powder had high concentration of heavy toxic metals which is the major public health problem. Thus, quality control for food safety recommended during production of coffee.