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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.
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.
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.
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.
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.
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.
Hashemi, Beshare,Zohrabi, Parvin,Kim, Ki-Hyun,Shamsipur, Mojtaba,Deep, Akash,Hong, Jongki Elsevier 2017 Trends in analytical chemistry Vol.97 No.-
<P>The liquid-phase microextraction (LPME) method is a sample pretreatment technique that uses small volumes of organic solvents to extract a wide variety of analytes from different matrices prior to instrumental analysis. The development of these techniques focuses on providing simple, inexpensive, and environmentally friendly extraction procedures for sample preparation or pretreatment. In this review, the most recent developments in LPME techniques for the analysis of various environmental pollutants are summarized after being categorized into several groups such as dispersive liquid liquid microextraction (DLLME), ferrofluid-based microextraction, supramolecular-based liquid phase micro extraction, and vortex-assisted liquid liquid microextraction. Moreover, the extraction principles, the solvent production mechanism, and the historical development of the LPME techniques are also discussed. Finally, recent reports on the applications of these methodologies are reviewed. (C) 2017 Elsevier B.V. All rights reserved.</P>