Chaudhary R.G.,Seth Kesarimal Porwal College |
Chaudhary R.G.,Rashtrasant Tukadoji Maharaj Nagpur University |
Juneja H.D.,Rashtrasant Tukadoji Maharaj Nagpur University |
Pagadala R.,University of KwaZulu - Natal |
And 2 more authors.
Journal of Saudi Chemical Society | Year: 2014
The four chelate polymer complexes commonly called as coordination polymers of Mn(II), Co(II), Ni(II) and Cu(II) ions with fbpmpc (fbpmpc = fumaroyl bis (paramethoxyphenylcarbamide)) were synthesized and characterised by elemental analyses, infrared spectroscopy, diffuse reflectance, magnetic moment susceptibility, thermal analysis, X-ray diffraction, electrical conductivity and scanning electron microscopy technique (SEM). SEM investigations of coordination polymers were found in different shapes and sizes, though they are synthesized from a single ligand. Each metal ion is coordinated by a bis (bidentate) manner through oxygen atom of the carboxylato group and the nitrogen atom of an amide group of ligand and two aqua ligands by coordinated bond which formed 6-member heterocyclic ring. In the present article, the main aim of research study is to find out the comparative studies of coordination polymers such as thermogravimetry (TG), derivative thermogravimetry (DTG), differential thermal analysis (DTA), electrical conductivity and morphology behaviour. Furthermore, the electrical conductivities of chelating ligand and coordination polymers were determined in the solid state powder form. The electrical conductivities measurements of undoped and doped ligand, coordination polymers were carried out at room temperature by the four probe technique using an electrometer. Thermal degradation studies of the coordination polymers have been carried out from a non-isothermal condition under nitrogen atmosphere at a heating rate of 10 °C min-1. The decomposition steps and thermal stabilities of these complexes were confirmed by thermal analysis techniques (TG/DTG/DTA). The thermal studies inferred the presence of crystallized water in all coordination polymers, whereas coordinated water was found in Ni(II) and Cu(II) ions. © 2014.
Kadukar M.R.,Rashtrasant Tukadoji Maharaj Nagpur University |
Yawalkar P.W.,Nabira Mahavidyalaya |
Choithrani R.,Barkatullah University |
Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2015
Dy3+ and Eu3+ activated Ca3Y2Si3O12 phosphors were synthesized by the solid-state synthesis method. The phosphors were characterized by X-ray diffraction (XRD), mechanoluminescence (ML), thermoluminescence (TL) and photoluminescence (PL) to determine structure and luminescence. For ML glow curves, only one peak was observed, as only one type of luminescence centre was formed during irradiation. The Ca3Y2Si3O12:Dy3+ TL glow curve showed a single peak at 151.55C and the Ca3Y2Si3O12:Eu3+ TL glow curve peaked at 323C with a small peak at 192C, indicating that two types of traps were activated. The trapping parameters for both the samples were calculated using Chen's peak shape method. Dy3+-activated Ca3Y2Si3O12 showed emission at 482 and 574 nm when excited by a 351 nm excitation wavelength, whereas the Eu3+-activated Ca3Y2Si3O12 phosphor PL emission spectra showed emission peaks at 613 nm, 591 nm, 580 nm when excited at 395 nm wavelength. When excited at 466 nm, prominent emission peaks were observed at their respective positions with very slight shifts. Copyright © 2015 John Wiley & Sons, Ltd.
Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University |
Kore B.P.,Rashtrasant Tukadoji Maharaj Nagpur University |
Yerpude A.N.,Rashtrasant Tukadoji Maharaj Nagpur University |
Kohale R.L.,Rashtrasant Tukadoji Maharaj Nagpur University |
And 2 more authors.
Optik | Year: 2015
Eu3+ activated Sr5SiO4Cl6 phosphor and Sr2P2O7 doped with Dy3+ are synthesized by solid state method and NaAlSiO4 doped with Tb3+ is prepared by a sol-gel method. All the prepared phosphors were characterized by X-ray powder diffraction (XRD), photoluminescence (PL) properties and CIE color co-ordinates. The emission peaks of Eu3+ activated Sr5SiO4Cl6 phosphor are located at 597 nm and 616 nm corresponding to the 5D0→7F1 and 5D0→7F2 transitions of Eu3+, under near-UV excitation (395 nm). Photoluminescence emission spectra of Sr2P2O7:Dy3+ phosphor shows an excitation at around 354 nm gives emission peaks at 484 nm (blue) and 575 nm (yellow) are ascribed to the typical 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions of Dy3+ respectively. Upon excitation with 379 nm, it is observed that there is a strong emission at around 545 nm corresponding to the 5D4-7F5 transition of Tb3+ in NaAlSiO4 host. CIE color co-ordinates of Sr5SiO4Cl6:Eu3+ phosphors are (x = 0.6825, y = 0.3172), Sr2P2O7:Dy3+ phosphor of color blue were (x = 0.0734, y = 0.1850) and color yellow were (x = 0.4787, y = 0.5202), CIE color co-ordinates of NaAlSiO4 doped with Tb3+ are (x = 0.2801, y = 0.7117). The results indicate that all the prepared phosphors might be promising candidates as blue, green, yellow and red emitting components for potential solid-state lighting application and green lighting technology. © 2015 Elsevier GmbH. All rights reserved.
Borkar A.D.,Nabira Mahavidyalaya |
Heda P.B.,Visvesvaraya National Institute of Technology |
Umare S.S.,Visvesvaraya National Institute of Technology
Materials Research Innovations | Year: 2011
Poly(aniline-co-o-anisidine)s were synthesised by chemical peroxidative copolymerisation of aniline with o-anisidine in aqueous acidic medium under nitrogen atmosphere. The molar feed ratio of the monomers was varied in copolymerisation reaction in order to obtain copolymers of different compositions. The actual monomeric composition in the copolymers was estimated by integrated proton nuclear magnetic resonance spectroscopy. Owing to the difference in reactivities of aniline and o-anisidine, the content of o-anisidine in the copolymer was higher than the monomer taken in the reaction mixture. The electrical conductivity of the copolymers strongly depends on the amount of aniline incorporated, and it decreases with increasing oanisidine content in the copolymer, which may lower the structural regularity of the copolymer. It is suggested from the temperature dependence of the electrical conductivity that the electrical conduction mechanism of the copolymer is polaron hopping conduction similar to that of homopolymers. The applications of copolymer as anion exchange resin and acid-base indicator are presented. © W. S. Maney & Son Ltd. 2011.
Hadda T.B.,University Mohammed Premier |
Khardli F.Z.,University Mohammed Premier |
Mimouni M.,University Mohammed Premier |
Daoudi M.,University Sidi Mohammed Ben Abdellah |
And 5 more authors.
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2014
(Equation present) A series of four different armed heterocyclic candidates; 1-(2-methyl-2,3-dihydro-1,3-benzothiazol-2-yl)acetone (2), 1-(3-methyl-4H-1,4-benzothiazin-2-yl)ethanone (3), 2-[(2-aminophenyl)dithio] aniline (4), and 3-hydroxy-3-methyl-4-(3-methyl-2-quinoxalinyl)-2-butanone (5) have been prepared and their microbial activities were evaluated. A correlation of the structure and activities relationships of these compounds with respect to molecular modeling, Lipinski Rule of Five, drug likeness, toxicity profiles, and other physico-chemical properties of drugs are described and verified experimentally. © 2014 Copyright © Taylor & Francis Group, LLC.
Puri P.J.,Rashtrasant Tukadoji Maharaj Nagpur University |
Yenkie M.K.N.,Rashtrasant Tukadoji Maharaj Nagpur University |
Battalwar D.G.,Rashtrasant Tukadoji Maharaj Nagpur University |
Gandhare N.V.,Nabira Mahavidyalaya |
Dhanorkar D.B.,Maharashtra State Power Generation Company
Rasayan Journal of Chemistry | Year: 2010
This paper is intended to be a study concerning lake water pollution in Nagpur city, Maharashtra (India). Regional and seasonal variation of some physico-chemical parameters such as nutrients salts, total nitrogen and total phosphorous, in addition, temperature, pH, conductivity, dissolved oxygen (D0), chemical oxygen demand(COD), biological oxygen demand (BOD) and suspended solid (SS) were determined for the estimation of pollution load during the period from January to December 2008. The sampling points were selected on the basis of their importance. A monitoring network was set at representative site in the whole studied area and water samples were taken on a regular basis for laboratory analysis. Important variations have occurred in the investigated area as a result of human activity and discharge of waste water. During present study, Ambazari, Gandhisagar and Futala Lake water showed significant pollution as compared to Gorewada Lake. This is attributable to pollution due to human activities such as immersion of idols of God and Goddess during festival season, surface runoff resulting from rainfall, washing activities and sewage (poor) around Lake. All the calculated water quality parameters in studied lakes showed fair water quality rating in autumn season which then change to medium in rainy season and higher during summer season. The situation is alarming and degradation is in continuous process, therefore immediate action is required for its better management. © 2010 RASĀYAN. All rights reserved.
PubMed | Nabira Mahavidyalaya, Rashtrasant Tukadoji Maharaj Nagpur University and Barkatullah University
Type: Journal Article | Journal: Luminescence : the journal of biological and chemical luminescence | Year: 2016
Dy(3+) and Eu(3+) activated Ca3Y2Si3O12 phosphors were synthesized by the solid-state synthesis method. The phosphors were characterized by X-ray diffraction (XRD), mechanoluminescence (ML), thermoluminescence (TL) and photoluminescence (PL) to determine structure and luminescence. For ML glow curves, only one peak was observed, as only one type of luminescence centre was formed during irradiation. The Ca3Y2Si3O12:Dy(3+) TL glow curve showed a single peak at 151.55 C and the Ca3Y2Si3O12:Eu(3+) TL glow curve peaked at 323 C with a small peak at 192 C, indicating that two types of traps were activated. The trapping parameters for both the samples were calculated using Chens peak shape method. Dy(3+)-activated Ca3Y2Si3O12 showed emission at 482 and 574 nm when excited by a 351 nm excitation wavelength, whereas the Eu(3+)-activated Ca3 Y2Si3O12 phosphor PL emission spectra showed emission peaks at 613 nm, 591 nm, 580 nm when excited at 395 nm wavelength. When excited at 466 nm, prominent emission peaks were observed at their respective positions with very slight shifts.