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Highly Correlating Distance/Connectivity-Based Topological Indices. 1:QSPR Studies of Alkanes
Shamsipur, Mojtaba,Hemmateenejad, Bahram,Akhond, Morteza Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.2
Some new topological indices based on the distance matrix and Randic connectivity (as graph invariants) are proposed. The calculation of these indices is simple and they have good discriminating ability toward alkanes. Incorporating the number of carbon atoms to one of the calculated indices gives a highly correlating topological index (Sh index) which found to correlate with selected physicochemical properties of wide range of alkanes, specially, their boiling points. Most of the investigated properties are well modeled (with $r^2$> 0.99) by the Sh index. Meanwhile, the resulting regressions were compared with the results based on the well-established Randic and newly reported Xu indices and, in most cases, better results were obtained by the Sh index. Moreover, multiple linear regression analysis of the alkane properties via calculated indices gives highly correlating models with low standard errors.
Shamsipur, Mojtaba,Saeidi, Mahboubeh,Yari, Abdullah,Yaganeh-Faal, Ali,Mashhadizadeh, Mohammad Hossein,Azimi, Gholamhasan,Naeimi, Hossein,Sharghi, Hashem Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.5
A new PVC membrane electrode for $UO_2^{2+}$ ion based on 2,2'-[1,2-ethanediyl bis (nitriloethylidene)]bis(1-naphthalene) as a suitable ionophore was prepared. The electrode exhibites a Nernstian response for $UO_2^{2+}$ ion over a wide concentration range ($1.0{\times}10^{-1}-1.0{\times}10^{-7}$M) with a slope of 28.5 ${\pm}$ 0.8 mV/decade. The limit of detection is $7.0{\times}10^{-8}$M. The electrode has a response time of < 20 s and a useful working pH range of 3-4. The proposed membrane sensor shows good discriminating abilities towards $UO_2^{2+}$ ion with regard to several alkali, alkaline earth transition and heavy metal ions. It was successfully used to the recovery of uranyl ion from, tap water and, as an indicator electrode, in potentiometric titration of $UO_2^{2+}$ ion with Piroxycam.
Shamsipur, Mojtaba,Kazemi, Sayed Yahya,Niknam, Khodabaksh,Sharghi, Hashem Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.1
A new PVC-membrane electrode for $Ag^+$ ion based on a thia-substituted macrocyclic diamide has been prepared. The electrode exhibited a Nernstian response for $Ag^+$ over a wide concentration range $(1.7{\times}10^{-6}-1.0{\times}10^{-1}M)$. It has a response time <15 s and can be used for at least 3 months without divergence. The proposed membrane sensor revealed good selectivities for $Ag^+$ over a variety of metal ions and can be used in a pH range 3.0-7.5. It has been used successfully for direct determination of $Ag^+$ in different real samples and, as an indicator electrode, in the titration of silver ion.
Mojtaba Shamsipur,Sayed Yahya Kazemi 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.6
A chloroform membrane system containing a given mixture of benzylaza-12-crown-4 and oleic acid is introduced for the selective and efficient transport of Pb2+ ion. The transport was capable of moving metal ions ‘up-hill’. In the presence of S2O32 ion as a suitable metal ion acceptor in the receiving phase, the amount of lead ion transport across the liquid membrane after 150 minutes is (95.0 ± 1.7)%. The selectivity and efficiency of lead transport from aqueous solution containing Tl+, Ag+, Mg2+, Ca2+, Co2+, Ni2+, Cu2+, Zn2+, Hg2+ and Cd2+ were investigated. In the presence of thiosulfate as a suitable masking agent in the source phase, the interfering effects of Ag+ and Cu2+ were diminished drastically.
Saberyan, Kamal,Shamsipur, Mojtaba,Zolfonoun, Ehsan,Salavati-Niasari, Masoud Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.1
A fundamental study was developed concerning the novel solvent extraction of the tetravalent metal ions; zirconium(IV), hafnium(IV) and thorium(IV). Their extraction behavior in toluene was investigated with a recently synthesized naphthol-derivative Schiff base, 1-({[4-(4-{[(E)-1-(2-hydroxy-1-naphthyl)methyliden]amino}phenoxy) phenyl]imino}methyl)-2-naphthol (HAPMN). The spectrophotometrical examination of the complex formation between HAPMN and the Zr(IV), Hf(IV) and Th(IV) ions in acetonitrile revealed the formation of stable 1:1 complexes in the solution. After the thorium extraction in toluene, it was found that [Th(OH)3HA] was the respective deriving substance. While, in the case of zirconium and hafnium extraction, the extracted adduct was found to be [M4(OH)8(H2O)16Cl62HA]. The stoichiometric coefficients of these extracted species were determined by the slope analysis method. The extraction reaction followed a cation exchange mechanism.
Kamal Saberyan*,Mojtaba Shamsipur,Ehsan Zolfonoun,Masoud Salavati-Niasari 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.1
A fundamental study was developed concerning the novel solvent extraction of the tetravalent metal ions; zirconium(IV), hafnium(IV) and thorium(IV). Their extraction behavior in toluene was investigated with a recently synthesized naphthol-derivative Schiff base, 1-({[4-(4-{[(E)-1-(2-hydroxy-1-naphthyl)methyliden]amino}phenoxy) phenyl]imino}methyl)-2-naphthol (HAPMN). The spectrophotometrical examination of the complex formation between HAPMN and the Zr(IV), Hf(IV) and Th(IV) ions in acetonitrile revealed the formation of stable 1:1 complexes in the solution. After the thorium extraction in toluene, it was found that [Th(OH)3HA] was the respective deriving substance. While, in the case of zirconium and hafnium extraction, the extracted adduct was found to be [M4(OH)8(H2O)16Cl62HA]. The stoichiometric coefficients of these extracted species were determined by the slope analysis method. The extraction reaction followed a cation exchange mechanism.
Behrouz Bagheri,Ali Shamsipur,Amin Abdollahzadeh,Seyyed Ehsan Mirsalehi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In this work, aluminum-copper composites reinforced with 50 nm and 250 nm SiC particles are fabricated on the interfaceof sheets by friction stir spot welding for the first time. In addition, the finite element method is used to study visual andunderstand the temperature distribution and mechanical characteristics of the composite with different nanoparticle sizes. Micro stress/strain field mainly simulated the impacts of particle size and particle distribution in the matrix. Results showedthat large reinforcing particles lead to an increase in temperature distribution and grain size in the stir zone of the jointsample. It was also concluded that the addition of finer nanoparticle size causes higher shear tensile (5.4 MPa) and Von-Mises stress (260 MPa) in the workpiece due to higher homogeneous distribution and less agglomeration in the matrix. Inaddition, the thickness of the intermetallic compound (IMCs) layer at the interface of the joint interface was analyzed as SiCparticles with different sizes are used due to higher interaction and intermixing between materials. The stress distributionand equivalent plastic strain of particles in the stir zone, with the uniform distribution of reinforcing particles for lower size(50 nm), increased.
Kazemi, Sayed Yahya,Shamsipur, Mojtaba Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.6
A chloroform membrane system containing a given mixture of benzylaza-12-crown-4 and oleic acid is introduced for the selective and efficient transport of $Pb^{2+}$ ion. The transport was capable of moving metal ions ‘up-hill’. In the presence of ${S_2O_3}^{2-}$ion as a suitable metal ion acceptor in the receiving phase, the amount of lead ion transport across the liquid membrane after 150 minutes is (95.0 ${\pm}$ 1.7)%. The selectivity and efficiency of lead transport from aqueous solution containing $Tl^+,\;Ag^+,\;Mg^{2+},\;Ca^{2+},\;Co^{2+},$ $Ni^{2+},\;Cu^{2+},\;Zn^{2+},\;Hg^{2+}$ and $Cd^{2+}$were investigated. In the presence of thiosulfate as a suitable masking agent in the source phase, the interfering effects of $Ag^+\;and\;Cu^{2+}$ were diminished drastically.