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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Interaction,Photovoltaic,Dye-sensitized solar cells,Redox mediator,Cobalt complexes
- چکیده:
- چکیده انگلیسی: The effects of changing ligand structures of cobalt complexes as electrolytes on the performance of the dye-sensitized solar cell were investigated. In this paper, cobalt(II/III) tris(2,2′-bipyridine), cobalt(II/III) tris(4,4′-dimethyl-2,2′-bipyridine) and cobalt(II/III) tris(4,4´-dimethoxy-2,2′-bipyridine) complexes as electrolytes in conjugate with organic dye D149 were investigated to consider the correlation of the cobalt complexes structural on the efficiency of the dye-sensitized solar cell. The Voc values of the prepared cells are related to the redox potential of their complexes and the maximum Voc was observed with cobalt(II/III) tris(2,2′-bipyridine) electrolyte. The obtained results represented that the cobalt(II/III) tris(4,4´-dimethyl- 2,2′-bipyridine) electrolyte has the highest efficiency in the solar cell compared with other cobalt complexes. These observed results have been interpreted by a possible interaction between the dye and cobalt complexes, which is more pronounced in the cobalt(II/III) tris(4,4´-dimethoxy- 2,2′-bipyridine) cell. This interaction should be fine-tuning with the structure of dye and complex to increase the efficiency of the dye-sensitized solar cell. In addition, the results demonstrated that a thinner layer of the TiO2 film decrease both the effects of mass transport issues and the charge recombination, therefore, it has significant advantages for cobalt electrolyte.
- انتشار مقاله: 20-11-1398
- نویسندگان: Zahra Parsa,Pooya Tahay,Navid Rabiee,Nasser Safari
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Hydrogen bonding,Manganese porphyrin,Hydroxylation,Active oxidizing species,Axial ligand
- چکیده:
- چکیده انگلیسی: Some meso-tetra aryl porphyrinato manganese (III) acetate or chloride complexes including meso-tetraphenyl porphyrinato manganese (III) chloride (TPPMnCl), meso-tetrakis(2,3-dimethoxyphenyl)porphyrinato manganese(III) acetate, (T(2,3-OMeP)PMnOAc) and meso-tetrakis(pentaflourophenyl)porphyrinato manganese (III) acetate (TPFPPMnOAc) were synthesized. These porphyrins were used as catalyst in the oxidation of various alkanes in the presence of pyridine and imidazole as axial ligands. It was revealed that the catalytic activity depends on the existence of hydrogen bonding between the axial base and the substituents on the ortho position of the phenyl ring, in addition to usual electronic and steric effects. Therefore, T(2,3-OMeP)PMnOAc and TPFPPMnOAc exhibited higher catalytic activity than TPPMnCl owing to the presence of such hydrogen bonding between substitutions on the periphery of the porphyrin ring and coordinated axial ligand. Also, the selectivity of these two Manganese porphyrins significantly varies in the presence of pyridine and imidazole for the alkane hydroxylation and is reversed for the alkene epoxidation, suggesting different active oxidizing agent produced by pyridine and imidazole.
- انتشار مقاله: 31-01-1397
- نویسندگان: Mahdie Saghian,Tahereh Alemohammad,Nasser Safari
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: 1,crystal structure,Cu(II) complexes,10-Phenanthroline,Thiodiacetic acid,Cyclic voltammogram. Antimicrobial activities
- چکیده:
- چکیده انگلیسی: Copper complexes of [Cu(phen)(tda)].2H2O(1) and [(phen)2Cu(µ-tda) Cu(phen)](ClO4)2.1.5H2O (2) (where phen is 1,10-phenanthroline and tda2- is thiodiacetate) have been synthesized. Both complexes were characterized by elemental analysis, IR, UV–Vis spectroscopy and cyclic voltammetry. Their solid state structures were determined by the single crystal X-Ray Diffraction method. Complex 1 is mononuclear and copper has accepted a five-coordinated square-based pyramidal structure with the tda2- anion facially coordinated to copper(II). Complex 2 has accepted an unsymmetrical square pyramidal coordination of two distinct copper complexes, one containing two phenanthroline and the other containing one phenanthroline and one tda2-, bridged by a carboxylate oxygen. The strong biological activity of these compounds against six reference bacterial included Bacillus subtilis (ATCC 465), Enterococcus faecalis (ATCC 29737), Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Klebsiella pneumoniae (ATCC 10031), and Pseudomonas aeruginosa (ATCC 85327) were investigated.
- انتشار مقاله: 04-03-1392
- نویسندگان: Abolfazl Abbaszadeh,Nasser Safari,Vahid Amani,Behrouz Notash,Fereshteh Raei,Fereshteh Eftekhar
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Oxidation,Phthalocyanine,Cyclohexene,Cyclooctene,Catalyzed Oxidation
- چکیده:
- چکیده انگلیسی: First row transition metal complexes of phthalocyanine are employed as catalysts for the oxidation of cyclohexene and cyclooctene using iodosylbenzene and pentafluoroiodosyl benzene. The catalysis was performed in dichloromethane: methanol:water (80:18:2) solvent mixture. The products of the catalysis for cyclohexene are epoxycyclohexane, 2-cyclohexene-1-ol and 2-cyclohexene-1-one whereas for cyclooctene it is specifically cyclooctene oxide. For cyclohexene oxidation epoxide yield and selectivity is in the order of MnII > FeIII > FeII > CoII > CrIII > NiII > CuII , while for 2-cyclohexene-1-one production the ability of the catalysts are in the order of NiII > CoII > CuII > CrIII > FeIII > FeII > MnII .
- انتشار مقاله: 26-11-1383
- نویسندگان: Mahtab Piroozmand,Nasser Safari,Abbas Ali Samadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Interaction,Photovoltaic,Dye-sensitized solar cells,Redox mediator,Cobalt complexes
- چکیده:
- چکیده انگلیسی: The effects of changing ligand structures of cobalt complexes as electrolytes on the performance of the dye-sensitized solar cell were investigated. In this paper, cobalt(II/III) tris(2,2′-bipyridine), cobalt(II/III) tris(4,4′-dimethyl-2,2′-bipyridine) and cobalt(II/III) tris(4,4´-dimethoxy-2,2′-bipyridine) complexes as electrolytes in conjugate with organic dye D149 were investigated to consider the correlation of the cobalt complexes structural on the efficiency of the dye-sensitized solar cell. The Voc values of the prepared cells are related to the redox potential of their complexes and the maximum Voc was observed with cobalt(II/III) tris(2,2′-bipyridine) electrolyte. The obtained results represented that the cobalt(II/III) tris(4,4´-dimethyl- 2,2′-bipyridine) electrolyte has the highest efficiency in the solar cell compared with other cobalt complexes. These observed results have been interpreted by a possible interaction between the dye and cobalt complexes, which is more pronounced in the cobalt(II/III) tris(4,4´-dimethoxy- 2,2′-bipyridine) cell. This interaction should be fine-tuning with the structure of dye and complex to increase the efficiency of the dye-sensitized solar cell. In addition, the results demonstrated that a thinner layer of the TiO2 film decrease both the effects of mass transport issues and the charge recombination, therefore, it has significant advantages for cobalt electrolyte.
- انتشار مقاله: 20-11-1398
- نویسندگان: Zahra Parsa,Pooya Tahay,Navid Rabiee,Nasser Safari
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Hydrogen bonding,Manganese porphyrin,Hydroxylation,Active oxidizing species,Axial ligand
- چکیده:
- چکیده انگلیسی: Some meso-tetra aryl porphyrinato manganese (III) acetate or chloride complexes including meso-tetraphenyl porphyrinato manganese (III) chloride (TPPMnCl), meso-tetrakis(2,3-dimethoxyphenyl)porphyrinato manganese(III) acetate, (T(2,3-OMeP)PMnOAc) and meso-tetrakis(pentaflourophenyl)porphyrinato manganese (III) acetate (TPFPPMnOAc) were synthesized. These porphyrins were used as catalyst in the oxidation of various alkanes in the presence of pyridine and imidazole as axial ligands. It was revealed that the catalytic activity depends on the existence of hydrogen bonding between the axial base and the substituents on the ortho position of the phenyl ring, in addition to usual electronic and steric effects. Therefore, T(2,3-OMeP)PMnOAc and TPFPPMnOAc exhibited higher catalytic activity than TPPMnCl owing to the presence of such hydrogen bonding between substitutions on the periphery of the porphyrin ring and coordinated axial ligand. Also, the selectivity of these two Manganese porphyrins significantly varies in the presence of pyridine and imidazole for the alkane hydroxylation and is reversed for the alkene epoxidation, suggesting different active oxidizing agent produced by pyridine and imidazole.
- انتشار مقاله: 31-01-1397
- نویسندگان: Mahdie Saghian,Tahereh Alemohammad,Nasser Safari
- مشاهده