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Synthesis of N-fused dithia and dibenzihomoporphyrins

Organic Chemistry Frontiers 2022年第6期9卷 1580-1588页

作者： Rima Sengupta Prosenjit Isar mangalampalli ravikanth Department of Chemistry Indian Institute of Technology BombayPowaiMumbai 400076India

N-Fused dithia and dibenzi homoporphyrins have been synthesized using a[2+2]approach by condensing one equivalent of appropriate dithienyl/di p-phenylene ethene diol with one equivalent of N-confused dipyrromethane in CH_(2)Cl_(2) under mild acid catalysed *** X-ray structure obtainedfor the N-fused dibenzi homoporphyrin revealed that the fused tripentacyclic ring was planar and wastilted by an angle of 11.35°whereas the p-phenylene moieties were highly deviated by angles of 48.70°and 50.93°from the mean plane defined by five meso carbon *** NMR and absorption featuressuggested the non-aromatic nature of both N-fused dithia and dibenzi *** DFT studiesrevealed that the N-fused dithia homoporphyrin was highly distorted with one thiophene ring facingoutside the macrocyclic *** spectral features of both N-fused dithia and dibenzi homoporphyrinswere supported by TD-DFT studies.

关键词： conditions cavity fused

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Allium cepa root tip assay in assessment of toxicity of magnesium oxide nanoparticles and microparticles

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Journal of Environmental Sciences 2018年第4期30卷 125-137页

作者： Bhanuramya mangalampalli Naresh Dumala Paramjit Grover Toxicology Unit Pharmacology and Toxicology Division CSIR-Indian Institute of Chemical Technology Academy of Scientific and Innovative Research CSIR-Indian Institute of Chemical Technology

Allium cepa bioassay had been used from decades for the assessment of toxicants and their harmful effects on environment as well as human health. Magnesium oxide（MgO） particles are being utilized in different fields. However, reports on the adverse effects of MgO nanoparticles on the environment and mankind are scarce. Hence, the toxicity of MgO particles is of concern because of their increased utilization. In the current study, A. cepa was used as an indicator to assess the toxicological efficiency of MgO nano-and microparticles（NPs and MPs） at a range of exposure concentrations（12.5, 25, 50, and100 μg/m L）. The toxicity was evaluated by using various bioassays on A. cepa root tip cells such as comet assay, oxidative stress and their uptake/internalization profile. Results indicated a dose dependent increase in chromosomal aberrations and decrease in mitotic index（MI） when compared to control cells and the effect was more significant for NPs than MPs（at p 〈 0.05）. Comet analysis revealed that the Deoxyribonucleic acid（DNA） damage in terms of percent tail DNA ranged from 6.8–30.1 over 12.5–100 μg/m L concentrations of MgO NPs and was found to be significant at the exposed concentrations. A significant increase in generation of hydrogen peroxide and superoxide radicals was observed in accordance with the lipid peroxidation profile in both MgO NPs and MPs treated plants when compared with control. In conclusion, this investigation revealed that MgO NPs exposure exhibited greater toxicity on A. cepa than MPs.

关键词： Magnesium oxide nanoparticles Allium cepa root tip assay Histochemical staining Oxidative stress Internalization of nanoparticles

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Optimization of luminescence properties of Tb^(3+)-doped a-Sr_2P_2O_7 phosphor synthesized by combustion method

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Rare Metals 2018年第7期37卷 587-593页

作者： Nimesh Prafulbhai Patel mangalampalli Srinivas Dhaval Modi Vishwnath Verma Kota Venkata Ramana Murthy Luminescence Material Laboratory Department of PhysicsFaculty of Science The M. S. University of Baroda Vadodara 390002 India Display Materials Laboratory Applied Physics DepartmentFaculty of Technology and Engineering The M. S. University of Baroda Vadodara 390001 India

In this paper, thermoluminescence （TL） properties of rare earth Tb^3＋-doped α-Sr2P2O7 were examined after β-irradiation and photoluminescence （PL） properties of samples were examined for proper excitation. All the samples were synthesized by high-temperature combustion method. The X-ray diffraction （XRD） and Fourier transform infrared （FTIR） spectroscopy characterization confirms the formation of pure α-phase with crystallized in orthorhombic structure of samples. The PL emission spectra of all samples exhibit characteristic green emission peaks of Tb^3＋ where the peak at 545 nm has the highest emission intensity for Tb^3＋ con- centration of 5.0 mol%. The TL glow curves of β-irradiated Tb^3＋-doped α-Sr2P2O7 phosphors were recorded at different heating rates of 2, 4, and 6 K.s^-1. TL curves of all sample exhibit combination of two peaks： peak at 420 K shifts toward higher 525 K remains unaffected temperature, while peak at with the increase in Tb^3＋ concentration as well as fading effect. The activation energy and kinetic parameters of the samples were evaluated using thermoluminescence peak shape method.

关键词： Rare earth doping Strontium pyrophosphate β-Irradiation Photoluminescence Thermoluminescence

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Estimating aquifer transmissivity using Dar-Zarrouk parameters to delineate groundwater potential zones in Alluri Seetharama Raju District,Andhra Pradesh, India

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Journal of Groundwater Science and Engineering 2023年第2期11卷 116-132页

作者： Bakuru Anandagajapathi Raju Palavai Venkateswara Rao mangalampalli Subrahmanyam Department of Geophysics Colleges of Science&TechnologyAndhra UniversityVisakhapatnam 530003Andhra PradeshIndia

This study aimed to explore groundwater potential zones in the EGMB of Alluri Seetharama Raju district, Andhra Pradesh, India, for drinking and agriculture purposes. To achieve this goal, 72 Vertical Electrical Soundings(VES) were conducted using the Schlumberger electrode configuration. The resistivity sounding data were analyzed to determine the aquifer thickness, basement depth, Dar-Zarrouk parameters,and aquifer transmissivity. Spatial distribution maps were generated for these parameters to understand the subsurface formation. The analysis revealed a linear groundwater potential zone(8.46 km~2) in the eastern part of the study area, extending in the NNE-SSW direction for 9.6 km. Six VES locations(P24, P27, P29,P30, P33, and P38) in this zone exhibit good potential(>30 m aquifer thickness), while the three VES locations(OP19, P5, and P46) in the central region are recommended for drilling bore wells. Additionally,moderate aquifer thickness(20–30 m) are identified in other VES locations(OP14, OP20, P4, P10, P12,P13, P15, P17, P18, P31, P46, and P50) along streams in the western and central part of the area, which can yield reasonable quantities of water. This information is useful for groundwater exploration and watershed management to meet the demands of tribal population in the study area.

关键词： Vertical electrical sounding Longitudinal conductance Transverse resistance Coefficient of anisotropy Potential groundwater locations

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