ORIGINAL_ARTICLE
Preparation of Nickel Nanoparticles by Intramolecular Reaction of Nickel(II) Hydrazine Complex in the Solid State at Room Temperature
Ni6(N2H4)6(SO4)4(OH)2(H2O)8](SO4)(H2O)10 complex was prepared according to literature report. The reaction between aforementioned complex via sodium alkoxides as a reactants, were carried out in the solid state. The [Ni6(N2H4)6(SO4)4(OH)2(H2O)8](SO4)(H2O)10 undergoes an intramolecular two electrons oxidation-reduction reaction at room temperature and metallic nickel nanoparticles (Ni1-Ni5) was produced. The aforesaid complex contains nickel (II) as an oxidizing agent and also hydrazine ligand as a reducing agent. Its redox reaction leads to the formation of other products, sodium azide and ammonia gas and alcohols. In such a solid state reaction, not only the intramolecular redox reaction is important but also it is a novel method in the synthesis of nanoparticles. The nickel metal nanoparticles were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) analysis. The synthesized nickel nanoparticles have similar morphologies however the particle size distributions are different. The nickel nanoparticles have particle size distributions ranging from 10 to 75 nm. This work presents a novel approach in the intramolecular redox reactions in the solid state, and provides insight into the synthesis of metal nanoparticles via metal hydrazine complexes at room temperature.
https://www.inorgchemres.org/article_32664_5aaa00270e1f46e09e23a8e3b469ca87.pdf
2017-07-01
1
8
10.22036/icr.2016.32664
Intramolecular reaction
Chemical reduction
Mechanochemical reaction
Nickel nanoparticle
Seyed Abolghasem
Kahani*
1
Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan 87317-51167, Iran
AUTHOR
Massumeh
Khedmati
mkhedmati86@yahoo.com
2
Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan 87317-51167, Iran
AUTHOR
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ORIGINAL_ARTICLE
Electrochemistry, Thermalanalysis, and Theoretical Study of Vanadyl Schiff Base Complexes
The VO(IV) complexes of tridentate ONO Schiff base ligands derived from 2- aminobenzoicacid and salicylaldehyde derivatives were synthesized and characterized by IR, UV–Vis and elemental analysis. Electrochemical properties of the vanadyl complexes were investigated by cyclic voltammetry. A good linear correlation was observed between the oxidation potentials and the electron-withdrawing character of the substituents on the Schiff bases, showed the following trend: MeO < H < Br < NO2. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the synthesized complexes were carried out in the range of 20–700 °C. All of the complexes decomposed in three steps. The thermal decomposition pathways were closely related to the nature of the Schiff base ligands and preceded via first-order kinetics. The structures of compounds were determined by ab initio calculations. The optimized molecular geometry was calculated at the B3LYP/6-31G(d) level. The results suggested that, in the complexes, V(IV) ion was in square-pyramid or TBP (trigonal bipyramidal) NO4 coordination geometry. Also the bond lengths and angles were studied and compared.
https://www.inorgchemres.org/article_33228_a08cd536691a4b90c5aff1f1a8390ab5.pdf
2017-07-01
9
20
10.22036/icr.2016.33228
Vanadyl complexes
Tridentate schiff base ligands
Schiff base Complexes
Thermogravimetry
Electrochemistry
Ab initio calculations
Ali Hossein
Kianfar
akianfar@cc.iut.ac.ir
1
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran, 84156-83111
LEAD_AUTHOR
Hajar
Mohamadi Malek Abadi
2
Department of Chemistry, Yasouj University, Yasouj, Iran
AUTHOR
Roghayeh
Hashemi Fath
3
Department of Chemistry, Yasouj University, Yasouj, Iran
AUTHOR
Mahmoud
Roushani
4
Department of Chemistry, Ilam University, Ilam, Iran
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ORIGINAL_ARTICLE
Multi-wall Carbon Nanotubes Supported Molybdenum Acetylacetonate: Efficient and Highly Reusable Catalysts for Oxidation of Sulfides with Tert-butyl Hydroperoxide
In the present work, highly efficient oxidation of sulfides catalyzed by MoO2(acac)2 supported on multi-wall carbon nanotubes, MWCNTs, modified with 1,2-diaminobenzene (DAB) and 2-aminophenol (AP), at room temperature are reported. The effects of various parameters such as reaction time, solvent, catalyst amount, oxidant, etc, were studied. These heterogenized catalysts showed high activity in the oxidation of a variety of linear, cyclic and aromatic sulfides with tert-butyl hydroperoxide (TBHP) in 1,2-dichloroethane as solvent under mild conditions. In these systems sulfides have been selectively oxidized to the corresponding sulfoxides and sulfones with short reaction times and high yields. In the case of aromatic sulfides, sulfoxide was produced as major product and in the case of linear sulfides only sulfoxide was produced. The [MoO2(acac)@amines-MWCNT] catalysts are stable under the reaction conditions and While, the homogeneous MoO2(acac)2 cannot recovered even one time, the MWCNT supported catalysts can be filtered and reused several times without significant loss of their activity.
https://www.inorgchemres.org/article_33244_84dc56238b7890265199899378effec4.pdf
2017-07-01
21
30
10.22036/icr.2016.33244
Molybdenumacetylacetonate
Multi-wall carbon nanotubes
Heterogeneous catalyst
oxidation
Mehdi
Araghi
mehdi.araghi83@yahoo.com
1
Department of Chemistry, Saveh Branch, Islamic Azad University, Saveh, Iran
LEAD_AUTHOR
Shaghayegh
Aghamohammad
saghamohammad@yahoo.com
2
Department of Chemistry, Saveh Branch, Islamic Azad University, Saveh, Iran
AUTHOR
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of Organic Compounds; Academic Press: New York,
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ORIGINAL_ARTICLE
Ammonium Decatungstocerate(IV): An Efficient Catalyst for the Protection and Deprotection of Tetrahydropyranyl Ethers
In multi-step organic syntheses, the protection and deprotection of tetrahydropyranyl (THP) ethers is one of the most frequently used methods. Over the years, different methods have been used from various catalytic systems for the protection of hydroxyl groups as THP ethers and their deprotection. Herein we have reported that various alcohols and phenols have been efficiently converted to the corresponding THP ethers in high to excellent yields using catalytic amounts of ammonium decatungstocerate(IV) at room temperature. In the presence of this catalyst, various THP ethers have also been deprotected to the parent alcoholic or phenolic compounds. Mild reaction conditions, high to excellent yields, easy handling, compatibility with the other protecting groups and heterogeneous, non-toxic and cost-effective catalyst are some of the major advantages of this procedure. Because of its operational simplicity, generality, and efficacy, this method could be used for the conversion of various hydroxyl compounds to the corresponding THP ethers and vice-versa.
https://www.inorgchemres.org/article_33245_2ec174686d89ca91156e7802c32983ec.pdf
2017-07-01
31
39
10.22036/icr.2016.33245
Catalysis
Polyoxometalate
Protection
Deprotection
Tetrahydropyranyl ethers
Davud
Karimian
davud.karimian@gmail.com
1
Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
AUTHOR
Bahram
Yadollahi
yadollahi@sci.ui.ac.ir
2
Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
LEAD_AUTHOR
Valiollah
Mirkhani
mirkhani@sci.ui.ac.ir
3
Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
AUTHOR
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Organic Synthesis, 3rd ed., John Wiley & Sons, New
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ORIGINAL_ARTICLE
Synthesis and Crystal Structures of Three New Hetero-binuclear Hg(II)-Cu(II) Schiff Base Complexes
New hetero-binuclear Hg-Cu Schiff base complexes were prepared by reaction of 2,2'-[1,1'-(2,2-dimethylpropane-1,3-diyldinitrilo)-diethyldyne]diphenolato}copper(II) (CuL1) and 6,6'-X-2,2'-[(2,2-dimethylpropane-1,3-diyl)bis(nitrilomethanylylidene)]diphenolato copper(II) [(X = ethoxy (CuL2) and methoxy (CuL3)], with HgCl2 to give [Cu(L1)HgCl2] (1), [Cu(L2)HgCl2] (2), and [Cu(L3)HgCl2] (3), respectively. In the precursor Cu(II) complexes (CuL1-CuL3), the coordinated phenolic oxygen atoms and those of the substituents at 3,3'-positions (in 2 and 3) on aromatic ring can act as additional site of coordination to HgCl2 as metallo-ligand to make heterobinuclear Cu-Hg complexes. The H2L1, H2L2, and H2L3 Schiff base ligands were characterized by elemental analyses, 1H NMR and FT IR techniques. The related binuclear Cu-Hg complexes were characterized by elemental analyses and single-crystal X-ray diffraction. The main coordination sites for the HgCl2 unit are phenolic oxygen atoms and there are also short intramolecular Hg…O (methoxy, and ethoxy segments) contacts in 2 and 3. The crystal packing of 3 shows one-dimensional extended chains along the b-axis through pair of centro-symmetric C–H…Cl interactions. The new complexes crystallize in Pbca (1), P21/n (2), and P21/c (3) space groups.
https://www.inorgchemres.org/article_33375_eb454f907bfb4b6faeea71bb5b776fa7.pdf
2017-07-01
40
49
10.22036/icr.2016.33375
Bimetallic complexes
Schiff base Complexes
Mercury complexes
Hadi
Kargar
hadi_kargar@yahoo.com
1
Hadi Kargar Assistant Prof. of Inorganic Chemistry Department of Chemistry Payame Noor University Ardakan I.R. of Iran e-mail: h.kargar@pnu.ac.ir Tel.: +98-352-7220011 ext. 157 Fax: +98-352-7228110
LEAD_AUTHOR
Reza
Kia*
2
Chemistry Department, Sharif University of Technology, P.O. Box: 11155-3516 , Tehran, Iran
AUTHOR
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Coord. Chem. Rev. 126 (1993) 1.
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ORIGINAL_ARTICLE
Synthesis, Characterization and Antioxidant Activity of Two Novel Oxovanadium (IV) Curcuminoids
The reaction of bis[4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (curcumin) and two novel ligands of bis[4-tetrabenzylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetrabenzylglucose)curcumin) (BTBGC) and bis[4-tetraacetylglucose-3-methoxyphenyl]-1,6-heptadiene-3,5-dione (bis(tetraacetylglucose)curcumin) (BTAGC) with vanadium in methanol, in a 2:1 molar ratio, which yield the complexes of ML2 where M is [VO]2+, have been synthesized and characterized by FT-IR, mass spectrometry, 1H NMR spectroscopy and elemental analysis. These novel compounds were also examined for their antioxidant activity (using Trolox Equivalent Antioxidant Capacity (TEAC) antioxidant assay as a measure of their overall ability to scavenge free radicals compared to antioxidant standards such as Trolox); compounds with free hydroxyl groups were more active than those one whose locking such and also the metal complexes showed more activity than Trolox. The antioxidant capacity was decreased in BTBGC, BTAGC and their complexes compared to curcumin and its oxovanadium (IV) complex, corroborating the importance of curcumin’s free phenolic OH groups for scavenging oxidants potential. And also, the presence of the methoxy group increases the activity.
https://www.inorgchemres.org/article_33376_d25656466ef492d64fe7d52632ba03f7.pdf
2017-07-01
50
58
10.22036/icr.2016.33376
curcumin
Bis(tetrabenzylglucose)curcumin
Bis(tetraacetylglucose)curcumin
Vanadium
Antioxidant
Khosro
Mohammadi
khmohammadi@pgu.ac.ir
1
Chemistry Department, Faculty of Sciences, Persian Gulf University
LEAD_AUTHOR
Mansooreh
Zahedi
mzahedi83@yahoo.com
2
Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, I.R. Iran
AUTHOR
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ORIGINAL_ARTICLE
New Tetraaza Schiff Base Ligands and Their Complexes: Synthesis, Characterization and Thermodynamic Studies
Some new symmetrical tetraaza Schiff base ligands containing 2-quinolinecarboxaldehyde moiety formed from condensation reaction of 2-quinolinecarboxaldehyde and o-phenylenediamine derivatives, such as N, Nˊ-bis(2-quinolylmethylidene)-4-methoxy-1, 2-phenylenediimine (L1), N, Nˊ-bis(2-quinolylmethylidene)-4-methy-1, 2-phenylenediimine (L2), N, Nˊ-bis(2-quinolylmethylidene)-4-chloro-1, 2-phenylenediimine (L3), N, Nˊ-bis(2-quinolylmethylidene)-4-carboxylic-1, 2-phenylenediimine (L4), N, Nˊ-bis(2-quinolylmethylidene)-4-nitro-1, 2-phenylenediimine (L5), and their Ni(II), Cu(II), Zn(II) complexes, have been synthesized. The ligands and their metal complexes have been characterized by molar conductance, elemental analysis, IR, 1H-NMR and UV-Vis spectroscopy. The formation constant and the free energy of the complexes were determined using electronic spectroscopic titration at constant ionic strength 0.1 M (NaClO4), at 25°C in MeOH solvent. The comparison of the formation constants and the thermodynamic parameters show that the trend of complex formation toward a given ligand is as follows: L2 > L1 > L3 > L5 > L4 . The trend for complex formation of the metal ions with a given ligand is as follows: Zn (II) > Cu (II) > Ni (II).
https://www.inorgchemres.org/article_33377_0c6204e321377e6ec96b3098f606dc8c.pdf
2017-07-01
59
68
10.22036/icr.2016.33377
Tetraaza Schiff base
Schiff base Complexes
Formation constants
thermodynamic parameters
Free energy
Alison
Zamanpour
zamanpour.a@gmail.com
1
Department of Chemistry, Islamic Azad University, Firouzabad Branch, Firouzabad, Iran
LEAD_AUTHOR
Mozaffar
Asadi
asadi@susc.ac.ir
2
Chemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran
AUTHOR
Ghodratollah
Absalan
absalan@susc.ac.ir
3
Chemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran
AUTHOR
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ORIGINAL_ARTICLE
Synthesis, Characterization and X-Ray Crystal Structure of a Cobalt(III) Complex with 2-Bis(pyridine-2-carboxamido)-4,5-dimethylbenzene Ligand
An octahedral cobalt(III) complex, trans-[(Me2bpb)Co(bzlan)2]ClO4 (1), with H2Me2bpb = N,N’-(4,5-dimethyl-1,2-phenylene)dipicolinamide and bzlan = benzylamine, has been synthesized and characterized by elemental analyses, IR, UV-Vis, and 1H NMR spectroscopy. The structure of this complex has been determined by X-ray crystallography. The Me2bpb2– is a di-anionic tetradentate ligand furnishing a N4 set, such that two N atoms of the two pyridine rings and two amido N atoms occupy four equatorial positions. The two benzylamine ligands occupy the two axial positions leading to a distorted octahedral geometry around the central cobalt ion. The electrochemical behavior of this complex in acetonitrile solution indicates that the irreversible oxidation of 4,5-dimethylorthophenylene moiety and reduction of pyridine rings of the free ligand appear as reversible waves in the cyclic voltammogram of its cobalt(III) complex. Concomitant CoIII/CoII redox process and solvolysis in acetonitrile solution is observed. This irreversible redox process becomes reversible in the presence of excess benzylamine.
https://www.inorgchemres.org/article_33378_dc7b3235a1d731fdc82c1738d2f7d2df.pdf
2017-07-01
69
78
10.22036/icr.2016.33378
Substituted bispyridylamide
Cobalt(III) complex
crystal structure
Cyclic Voltammetry
Soraia
Meghdadi
smeghdad@cc.iut.ac.ir
1
Isfahan University of Technology
LEAD_AUTHOR
Kurt
Mereiter
kmereite@mail.zserv.tuwien.ac.at
2
Vienna University of Technology, Austria
AUTHOR
Narges
Shams Mohammadi
romochem@gmail.com
3
Isfahan University of Technology
AUTHOR
Ahmad
Amiri
ahmadamiri@ut.ac.ir
4
Department of Chemistry, University of Tehran
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ORIGINAL_ARTICLE
Synthesis of Zinc Dimethyldithiocarbamate by Reductive Disulfide Bond Cleavage of Tetramethylthiuram Disulfide in Presence of Zn2+
The zinc(II) complex [Zn2(dmdtc)2(μ-dmdtc)2] has been synthesized directly from thiram ligand, containing a disulfide bond {dmdtc = N,N-dimethyldithiocarbamate; thiram = N,N-tetramethylthiuram disulfide}, and characterized by elemental analysis and spectroscopic methods. Surprisingly thiram, undergoes a reductive disulfide bond scission upon reaction with Zn2+ in methanolic media to give the [Zn2(dmdtc)2(μ-dmdtc)2] complex. The crystal structure of Zn(II) complex has been determined by single crystal X-ray diffraction. Zinc is 4+1 coordinate, with four nearly identical tetrahedral bonds and a longer fifth bond being similar to some reported [Zn(dtc)2(L)] complexes. The crystal structure of this complex is built up of dimeric units, [Zn(dmdtc)(μ-dmdtc)2], so that each unit has two thiocarbamate groups, one wholly bound to a zinc atom as a bidentate ligand and the other in a bridging coordination mode between the two Zn(II) atoms. This structure clearly shows scission of the disulfide bond in the thiram ligand to give two dimethyldithiocarbamate ligands coordinated to the Zn(II) ion.
https://www.inorgchemres.org/article_33379_c395185ea274e815a21344a9e61348fb.pdf
2017-07-01
79
84
10.22036/icr.2016.33379
Zn(II) complex
crystal structure
Disulfide cleavage
Dimethyldithiocarbamate
Maryam
Bagheri
bagheri.iut@gmail.com
1
Department of Chemistry, Isfahan University of Technology
LEAD_AUTHOR
Kurt
Mereiter
kurt.mereiter@tuwien.ac.at
2
Faculty of Chemistry, Vienna University of Technology
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