- Khosro Mohammadi, Associate Professor of Inorganic Chemistry in Chemistry Department o Faculty of Sciences of Persian Gulf University in Iran.edit
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A new Ag(i) metal–organic framework (Ag-MOF) [Ag(p-OH-C6H4COOH)2(NO3)]n [Ag(PHBA)2(NO3)]n, (1) (PHBA: C8H6O4 {p-hydroxybenzoic acid}) was synthesized using two different methods; the laying method (single crystal) and sonochemical... more
A new Ag(i) metal–organic framework (Ag-MOF) [Ag(p-OH-C6H4COOH)2(NO3)]n [Ag(PHBA)2(NO3)]n, (1) (PHBA: C8H6O4 {p-hydroxybenzoic acid}) was synthesized using two different methods; the laying method (single crystal) and sonochemical irradiation (nanostructures).
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Synthesis, magnetic and spectroscopy techniques are described for five copper(II) containing tetradentate Schiff bases are synthesized from... more
Synthesis, magnetic and spectroscopy techniques are described for five copper(II) containing tetradentate Schiff bases are synthesized from methyl-2-(N-2'-aminoethane), (1-methyl-2'-aminoethane), (3-aminopropylamino)cyclopentenedithiocarboxylate. Molar conductance and infrared spectral evidences indicate that the complexes are four-coordinate in which the Schiff bases are coordinated as NNOS ligands. Room temperature μeff values for the complexes are 1.71-1.80B.M. corresponding to one unpaired electron respectively. The formation constants and free energies were measured spectrophotometrically, at constant ionic strength 0.1M (NaClO4), at 25˚C in DMF solvent. Also, the DFT calculations were carried out to determine the structural and the geometrical properties of the complexes. The DFT results are further supported by the experimental formation constants of these complexes.
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A series of new VO(IV) complexes with two new tetradentate Schiff base of... more
A series of new VO(IV) complexes with two new tetradentate Schiff base of 4,4'-(2,2-dimethylpropane-1,3-diyl)-bis(azan-1-yl-1-yldene)dipent-2-en-2-ol) [H(2)L(1)] and 3,3'-(2,2-dimethylpropane-1,3-diyl)azan-1-yl-1-ylidene)-bis(1-phenylbut-1-en-1-ol) [H(2)L(2)] (which have been derived from 2,2-dimethyl-1,3-diaminopropan, and diketones of acetylacetone and benzoylacetone) were synthesized and characterized by (1)H NMR, (13)C NMR, FT-IR, mass and UV-Vis spectrophotometry. The electrochemical properties of the vanadyl complexes were investigated by means of cyclic voltammetry. The oxidation potentials are increased by increasing the electron-withdrawing properties of functional groups of the Schiff base ligands according to the trend of Me<Ph. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the VO(IV) complexes were carried out in the range of 20-700°C. The complexes were decomposed in two stages. Also, decomposition of the synthesized complexes is related to the Schiff base characteristics. The thermal decomposition of the studied reactions was first order. The kinetic parameters for the decomposition steps in vanadyl complexes thermograms have been calculated.
Research Interests: Chemistry, Analytical Chemistry, Kinetics, Cyclic Voltammetry, Magnetic Resonance Spectroscopy, and 12 moreMedicine, Temperature, Schiff bases, Thermogravimetry, Electrons, Propane, Liquid Chromatography / Electrospray Ionization Mass Spectrometry, Schiff Base, Thermal Decomposition, Acetylacetone, Vanadates, and stereoisomerism
The interactions of bisdemethoxycurcumin (BDMC) as a bioactive constituent of turmeric and diacetylbisdemethoxycurcumin (DABC) as a novel synthetic derivative of curcumin with human serum albumin (HSA) have been investigated by... more
The interactions of bisdemethoxycurcumin (BDMC) as a bioactive constituent of turmeric and diacetylbisdemethoxycurcumin (DABC) as a novel synthetic derivative of curcumin with human serum albumin (HSA) have been investigated by fluorescence and circular dichroism (CD) spectroscopy. The binding parameters, including the number of substantive binding sites and the binding constants, have been estimated from the analysis of fluorescence measurements. The estimated binding parameters indicated that BDMC has higher affinity than DABC to bind HSA, suggesting the essential role of the phenolic OH groups of BDMC, which are acetylated in DABC. It was found that the binding site for BDMC and DABC is located in the vicinity of Trp-214 in subdomain IIA, which is the same as binding site for curcumin (CUR). The minor changes on the far-UV circular dichroism spectra resulted in partial changes in the calculated secondary structure contents of HSA. The negligible alteration in the secondary structure of HSA indicated that ligand-induced conformational changes are localized in the binding site and do not involve considerable changes in the protein folding. The visible CD spectra indicated that the optical activity observed during the ligand binding is due to induced-protein chirality.
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We prepared a new nano-hexadentate Schiff base and its nickel(ii) complex using an ultrasonic method, which produced NiO with an average size of 53 nm.
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ABSTRACT A series of new aluminum(III), gallium(III), and indium(III) complexes with three new tridentate Schiff base of 2-(3-hydroxy-1-methyl-but-2-enylideneamino)pyridine-3-ol [H2L1],... more
ABSTRACT A series of new aluminum(III), gallium(III), and indium(III) complexes with three new tridentate Schiff base of 2-(3-hydroxy-1-methyl-but-2-enylideneamino)pyridine-3-ol [H2L1], 2-(3-hydroxy-1-phenyl-but-2-enylideneamino)pyridine-3-ol [H2L2] and 2-(4-hydroxy-1,1,1-trifluoro-pent-2-enylideneamino)pyridine-3-ol [H2L3] (which have been derived from 2-amino-3-hydroxypyridine and diketones of acetylacetone, benzoylacetone, and 1,1,1-trifluoro-2,4-pentadione) with the general formula [Y][ML2] (M = Al3+, Ga3+, In3+ and Y = K+) were synthesized and characterized by 1HNMR, FT-IR and UV-vis spectrophotometry. The formation constants of the complexes were determined spectrophotometrically at 25°C in methanol. The trend of formation constants of the complexes are as follows:Al3+3+ 3+ 3+ H2L1 > H2L2 > H2L3
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Some new tetradentate Schiff base ligands (H3L) were prepared via condensation of 3,4-diaminobenzoic acid with 2-hydroxybenzaldehyde derivatives, such as 3,4-bis((E)-2,4-dihydroxybenzylideneamino)benzoic acid (H3L(1)),... more
Some new tetradentate Schiff base ligands (H3L) were prepared via condensation of 3,4-diaminobenzoic acid with 2-hydroxybenzaldehyde derivatives, such as 3,4-bis((E)-2,4-dihydroxybenzylideneamino)benzoic acid (H3L(1)), 3,4-bis((E)-2-hydroxy-3-methoxybenzylideneamino)benzoic acid (H3L(2)) and 3,4-bis((E)-5-bromo-2-hydroxybenzylideneamino)benzoic acid (H3L(4)). Additionally, a tetradentate Schiff base ligand 3,4-bis((E)-2-hydroxybenzylideneamino)benzoic acid (H3L(3)) and its complexes were synthesized. Their metal complexes of Co(II), Ni(II), Cu(II) and Zn(II) were prepared in good yields from the reaction of the ligands with the corresponding metal acetate. They were characterized based on IR, (1)H NMR, Mass spectroscopy and UV-Vis spectroscopy. Also, the formation constants of the complexes were measured by UV-Vis spectroscopic titration at constant ionic strength 0.1M (NaClO4), at 25 °C in dimethylformamide (DMF) as a solvent.
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A simple, highly efficient and green procedure for the condensation of aryl and alkyl 1,2-diamines with α-diketones in the presence of catalytic amounts of metalloporphyrins at room temperature is described. Using this method, quinoxaline... more
A simple, highly efficient and green procedure for the condensation of aryl and alkyl 1,2-diamines with α-diketones in the presence of catalytic amounts of metalloporphyrins at room temperature is described. Using this method, quinoxaline derivatives as biologically interesting compounds are produced in high to excellent yields and short reaction times. In this report, the effects of central metal in porphyrin core and substituents on tetraphenylporphyrin skeleton have been studied.
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Abstract Metal–organic frameworks (MOFs) are fabricated by linking inorganic and organic units by strong bonds (reticular synthesis). The flexibleness with that the constituents, geometry, size, and functionality could be varied has... more
Abstract Metal–organic frameworks (MOFs) are fabricated by linking inorganic and organic units by strong bonds (reticular synthesis). The flexibleness with that the constituents, geometry, size, and functionality could be varied has resulted to more than 20,000 different MOFs being reported and studied within the past decade. At the start of the chapter a brief overview, kinds of ligands and various methods for synthesis of MOFs are described. The unique feature of MOFs led to a crucial issue to many applications in which MOFs are promising candidates. Multiphoton absorption, shockwave chemistry, electronic and vibrational properties of MOFs, novel PVA/MOF nanofibers, synthesis of amine-functionalized MOFs discussed here.
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Background and Objective: Curcumin is a combination of active polyphenol from the Curcuma Langa plant, which has extensive biological activities including effects anti-inflammatory, anti-bacterial and cytotoxic markers for multiple cancer... more
Background and Objective: Curcumin is a combination of active polyphenol from the Curcuma Langa plant, which has extensive biological activities including effects anti-inflammatory, anti-bacterial and cytotoxic markers for multiple cancer cells. Berberine is an alkaloied isokinolin that is present in berberine and suppresses the growth of many tumor cells. This study was designed to determine the antibacterial effect of berberine and indium curcumin and indium diastile curcumin complexes against E-coli and Bacillus pumilus and comparison of their cytotoxicity on the cell lines of the bladder and stomach cancer cells. Methods: In this descriptive-analytic study, antimicrobial activity and cytotoxicity effect of berberine and indium curcumin and indium diastile curcumin complexes was investigated by MTT and dilution test method respectively. E-coli [BL21 (DE 3)], Bacillus pumilus (PTCC 1529), cell lines of bladder (5637) and stomach (AGS) were evaluated. Results: The minimum inhibitor...
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... Mozaffar Asadi,1 Sheida Esmaielzadeh,1 and Khosro Mohammadi2 1Chemistry Department, College of Sciences, Shiraz University, Shiraz, IR Iran 2Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, IR Iran ...
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Research Interests: Chemistry, Perchlorate, Cobalt, Acetonitrile, Acceptor, and 3 moreSteric Effects, Adduct, and Benzylamine
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ABSTRACT A set of two Cu(II) complexes, [Cu(cdXsalen)] and [Cu(cdXsalMeen)] derived from Schiff base ligands (H2cdXsalen: methyl-2-{[2-(2-X-phenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate and H2cdXsalMeen:... more
ABSTRACT A set of two Cu(II) complexes, [Cu(cdXsalen)] and [Cu(cdXsalMeen)] derived from Schiff base ligands (H2cdXsalen: methyl-2-{[2-(2-X-phenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate and H2cdXsalMeen: methyl-2-{[1-methyl-2-(2-X-phenyl)methylidynenitrilo]ethyl}amino-1-cyclopenteneithiocarb-oxylate where X = hydroxyl, methoxy, nitro, sodiumsulfite, chloro, bromo and H2cdMesalen: methyl-2-{[2-(2-hydroxyphenyl)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdPhsalen: methyl-2-{[2-(2-hydroxyphenyl)phenylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdMesalMeen: methyl-2-{[1-methyl-2-(2-hydroxyphenyl)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdPhsalMeen: methyl-2-{[1-methyl-2-(2-hydroxyphenyl)phenylidynenitrilo]ethyl}amino-1-cyclopentenedi-thiocarboxylate) with an unsymmetric NNOS coordination sphere have been synthesized and characterized by elemental analysis, IR, UV-Vis and mass spectrometry. The thermodynamic formation constants of the complexes were measured spectrophotometrically, at constant ionic strength 0.1 M (NaClO4), at 25 °C in DMF solvent. The trend of the complex formation for copper is as follow: [Cu(cdMesalen)] > [Cu(cdsalen)] > [Cu(cdPhsalen)] [Cu(cdMesalMeen)] > [Cu(cdsalMeen)] > [Cu(cdPhsalMeen)] and [Cu(cd5OMesalen)] > [Cu(cd3OMesalen)] > [Cu(cd4OMesalen)] [Cu(cd5OMesalMeen)] > [Cu(cd3OMesalMeen)] > [Cu(cd4OMesalMeen)] and [Cu(cd5OMesalen)] > [Cu(cdsalen)] > [Cu(cd5Brsalen)] > [Cu(cd5Clsalen)] > [Cu(cd5NO2 salen)] > [Cu(cd5SO3 Nasalen)] [Cu(cd5OMesalMeen)] > [Cu(cdsalMeen)] > [Cu(cd5BrsalMeen)] > [Cu(cd5ClsalMeen)] > [Cu(cd5NO2 salMeen)] > [Cu(cd5SO3 NasalMeen)] and [Cu (cdXsalMeen > [Cu (cdXsalen)] . The structure of {methyl-2-[N-[2-(5-chloro-2-phenolate)methylidynenitrilo]ethyl}aminato(-1)-1-cyclopentene-dithiocarboxylatecopper(II), [Cu(cd5Clsalen)], has been determined by X-ray crystallography. The complex shows normal planar geometry around the copper center.
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The metal ions constituents in plants reliable for determination of their medicinal, nutritional and toxicity properties. A novel, simple and accurate spectrophotometric method was developed for the simultaneous determination of Ag+, Cu2+... more
The metal ions constituents in plants reliable for determination of their medicinal, nutritional and toxicity properties. A novel, simple and accurate spectrophotometric method was developed for the simultaneous determination of Ag+, Cu2+ and Ni2+ ions in different medicinal plants without prior separation steps. This method was based on the different kinetic characteristics between the reactions of analytes with newly synthesized Schiff base as dimethyl 2,2’,-(ethan-1,2-diylbis1)bis(cyclopent-1-ene-1-carbodithioate(DEBC). All experimental conditions include, DEBC concentration, effects of pH and temperature was optimized. Also, orthogonal array design was applied for the construction of concentration. The differential kinetic spectra were monitored and recorded at 397 nm. The reaction orders were estimated with respect to complex mixture of analytes with DEBC. Limit of detections values were 0.013, 0.078 and 0.003 mg L-1 and limit of quantifications values were 0.043, 0.250 and 0.0...
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An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
We prepared a new nano-hexadentate Schiff base and its nickel(ii) complex using an ultrasonic method, which produced NiO with an average size of 53 nm.
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New complexes of Cu(2+), Hg(2+), and Cd(2+) with a recently synthesized Schiff base derived from 2-(3-hydroxy-1-methylbut-2-enylideneamino)pyridine-3-ol were applied for their simultaneous determination with artificial neural networks. A... more
New complexes of Cu(2+), Hg(2+), and Cd(2+) with a recently synthesized Schiff base derived from 2-(3-hydroxy-1-methylbut-2-enylideneamino)pyridine-3-ol were applied for their simultaneous determination with artificial neural networks. A new analytical method using principal component-feed forward neural networks (PC-FFNNs) and principal component-radial basis function networks (PC-RBFNs) was used. Spectral data was reduced using principal component analysis and subjected to ANNs. The data obtained from synthetic mixtures of metal ions were processed by PC-FFNNs and PC-RBFNs. Performances of the proposed methods were tested with regard to relative standard error of prediction. Limit of detections and limit of quantifications were determined. The results obtained by PC-FFNNs and PC-RBFNs were compared to each other. Under the working conditions, the proposed methods were successfully applied to simultaneous determination of Hg(2+), Cu(2+), and Cd(2+) in different water and soil samples. Concentrations of metal ions in the samples were also determined by flame atomic absorption spectrometry (FAAS) and standard addition method. The amounts of metal ions obtained by the proposed methods were in good agreement with those obtained by FAAS and standard addition method.
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Abstract A novel aqueous catalytic method for selective epoxidation of olefins and oxidation of saturated hydrocarbons to ketones using aqueous solution of tetra-n-butylammonium peroxomonosulfate (TBAOX) containing water-insoluble copper... more
Abstract A novel aqueous catalytic method for selective epoxidation of olefins and oxidation of saturated hydrocarbons to ketones using aqueous solution of tetra-n-butylammonium peroxomonosulfate (TBAOX) containing water-insoluble copper (II) phthalocyanine nanoparticles has been developed. No surfactants, additives, toxic reagents or solvents were involved. The impressive turnover numbers obtained for CuPc in this oxidation system displayed the high catalytic activity and relative stability of catalyst. The effective dispersity of CuPc in aqueous solution of TBAOX which yielded particles with average size of 30 nm, was the most important factor to affect the reaction rate. The catalyst could easily be recovered and reused without loss of activity and the reduced form of starting oxidant (n-Bu4NHSO4) could also be recycled.
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ABSTRACT Five new unsymmetrical Schiff bases containing NNOS coordination sphere and their Ni(II) complexes, NiLX (where X = 1-5, and L-1 = methyl-2-{N-[2-(acetone)triflourolidynenitrilo]ethyliamino-1-cyclopentenedithi-ocarboxylate, L-2 =... more
ABSTRACT Five new unsymmetrical Schiff bases containing NNOS coordination sphere and their Ni(II) complexes, NiLX (where X = 1-5, and L-1 = methyl-2-{N-[2-(acetone)triflourolidynenitrilo]ethyliamino-1-cyclopentenedithi-ocarboxylate, L-2 = methyl-2-{N-[2-(acetone)ethylidyneni-trilolethyliamino-1-cyclopentenedithiocarboxylate, L-3 = methyl-2-{N-[2-(acetone)phenylidy-nenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate, L-4 = methyl-2-{[1-methyl-2-(ace-tone)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate, L-5 = methyl-2-{[1-methyl-2-(acetone)ethylidynenitrilo]propyllamino-1-cyclopentenedithiocarboxylate) were synthesized and characterized by different chemical techniques such as elemental analysis, infrared spectra, NMR, mass and UV-Vis spectroscopy. The formation constants and the thermodynamic free energies were measured using UV-Vis spectrophotometry titration for 1:1 complex formation at constant ionic strength 0.01 M (NaClO4), at 25 degrees C in DMF solvent. The trend of the complex formation of the nickel complexes is as follow: NiL2 > NiL3 > NiL1 and NiL4 > NiL2 > NiL5. Also, the GAUSSIAN03 program package was used for calculating of structural, electronic and orbital's properties of the complexes. All calculations were done in gas phase. The DFT calculations supported the experimental formation constant.
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In the molecule of the title compound, [Co(C44H24Cl4N4){(C4H9)3P}2]ClO4, the CoIII centre has a slightly distorted octahedral geometry and is coordinated by four N atoms of the tetrapyrrolic ring in the equatorial positions and two... more
In the molecule of the title compound, [Co(C44H24Cl4N4){(C4H9)3P}2]ClO4, the CoIII centre has a slightly distorted octahedral geometry and is coordinated by four N atoms of the tetrapyrrolic ring in the equatorial positions and two phosphine ligands in the axial positions. The dihedral angles between meso-substituted chlorophenyl rings and the basic tetrapyrrolic ring are 82.66 (9), 82.16 (7), 83.97 (11) and 76.87 (8)°. In one of the phosphine ligands, the two terminal methyl groups are disordered over two positions with refined site-occupancy ratios of 0.70 (7):0.30 (7) and 0.66 (2):0.34 (2). In the crystal structure, molecules are linked together along the a axis by intermolecular C—H...Cl interactions. The crystal structure is further stabilized by intramolecular C—H...O and C—H...N interactions and intermolecular C—H...O and C—H...π interactions.
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Antiviral drug resistance is one of the most common problems in medicine, and, therefore, finding new antiviral agents, especially from natural resources, seems to be necessary. This study was designed to assay the antiviral activity of... more
Antiviral drug resistance is one of the most common problems in medicine, and, therefore, finding new antiviral agents, especially from natural resources, seems to be necessary. This study was designed to assay the antiviral activity of curcumin and its new derivatives like gallium-curcumin and Cu-curcumin on replication of HSV-1 in cell culture. The research was performed as an in vitro study in which the antiviral activity of different concentrations of three substances including curcumin, Gallium-curcumin and Cu-curcumin were tested on HSV-1. The cytotoxicity of the tested compounds was also evaluated on the Vero cell line. The CC50 values for curcumin, gallium-curcumin and Cu-curcumin were 484.2 microg/mL, 255.8 microg/mL and 326.6 microg/mL, respectively, and the respective IC50 values 33.0 microg/mL, 13.9 microg/mL and 23.1 microg/mL. The calculated SI values were 14.6, 18.4 and 14.1, respectively. The results showed that curcumin and its new derivatives have remarkable antivi...