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111.
112.
S. Bayan U. Das D. Mohanta 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,61(2):463-468
Barbules of the peacock feather have been used as the
natural template for developing assemblies of zinc oxide (ZnO) nanospheres.
The different colored barbules consisting of various photonic crystals
(extracted from eye-pattern) were characterized in terms of the stop-bands
identified in the respective Reflectance spectra. The stop-bands of the
photonic crystals are found to get red-shifted after the loading of ZnO
nanospheres and was reasoned to the modification of photonic band gap. The
ZnO nanosphere decorated barbules show well defined photoluminescence
response with dominant defect related emission of ZnO. The artificially
grown inorganic structures on natural templates form a basis of new hybrid
system that can help in exploiting photonic band gap engineering and light
wave modulation with high selectivity. 相似文献
113.
Susanta HazraSuraj Mondal Michel FleckSujit Sasmal E. Carolina Sañudo Sasankasekhar Mohanta 《Polyhedron》2011,30(11):1906-1913
The work in this paper reports syntheses, molecular and supramolecular structures, electrochemistry and magnetic properties of two diphenoxo-bridged dinickel(II) compounds [NiII2L(N3)2(H2O)2]·CH3CN (1) and [NiII2L(N3)2(H2O)] (2), where H2L is the tetraimino diphenolate macrocyclic ligand, obtained on [2 + 2] condensation of 4-methyl-2,6-diformylphenol and 2,2′-dimethyl-1,3-diaminopropane. Brown colored compound 1 and green colored compound 2 are produced from the same reaction mixture as a function of temperature; 1 is formed from the reaction mixture in acetonitrile at low temperature (ca. 5 °C), while 2 is formed on heating the reaction mixture in acetonitrile. Crystals of compounds 1 and 2 are monoclinic (space group P21/c) and orthorhombic (space group P212121), respectively. Analyses of the crystal packing of the crystalline phases reveal that two-dimensional topologies are resulted in both 1 and 2 due to hydrogen bonding interactions. Variable-temperature (2-300 K) magnetic susceptibility measurements of the two compounds reveal that the metal centers in both the complexes are coupled by moderate antiferromagnetic interactions with J values (H = -2JS1·S2) −18.8 and −34.2 cm−1 for 1 and 2, respectively. Electrochemical analyses of 2 reveal that this compound exhibits two-step reduction couples at E½ = −977 and −1155 mV. 相似文献
114.
Inexpensive production and characteristic magnetoconductance fluctuation of Ge-supported stable graphene/graphene oxide layers
are being reported. The changeover from graphite to graphene oxide structure during synthesis was evident from X-ray diffraction
patterns whereas development of mono and bilayer graphene/graphene oxide was confirmed by electron microscopy studies. Responding
to applied magnetic fields (up to 0.3 T), the Ge-supported graphene layers are shown to exhibit prominent magnetoconductance
steps and are attributed to the alteration of Landau levels across the Fermi surface. While low-cost fabrication process is
attractive for large scale production, the advantage of short synthesis time and understanding magneto-transport mechanism
would find relevance in graphene-based nanodevices and circuits. 相似文献
115.
We have made bulk and local investigations on defect induced magnetism in highly oriented pyrolytic graphite (HOPG) irradiated with a 40 MeV carbon beam. The local magnetic response of irradiated HOPG was studied by measuring the hyperfine field of recoil implanted (19)F using γ-ray time differential perturbed angular distribution (TDPAD) measurements. While the bulk magnetic properties of the irradiated sample show features characteristic of room temperature ferromagnetism, the hyperfine field data reflect enhanced paramagnetism with no indication of long range magnetic ordering. The experimental studies are further supported by ab initio density functional calculations. We believe that the ferromagnetic response in irradiated HOPG arises mostly from defect induced magnetic moments of carbon atoms in the near surface region, while those deep inside the host matrix remain paramagnetic. 相似文献
116.
Mohanta Ram Krushna Kumawat Devilal Ravi G. Tahiliani Kumudni 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2023,77(5):1-6
The European Physical Journal D - In the present work, we report an investigation on the importance of using realistic partition functions in the opacity calculations of lanthanide ions whether... 相似文献
117.
Abhishek Pramanik Dr. Samit Majumder Rampada Das Prof. Sasankasekhar Mohanta 《欧洲无机化学杂志》2023,26(22):e202300058
A fluorescent dinuclear cadmium(II) based discrete metal complex of composition [CdII2L(μ-Cl)Cl2]( 1 ) is used {HL=2,6-bis[2-(methylamino)ethyliminomethyl]-4-Ethylphenol} for the specific recognition of 2,4,6-trinitrophenol (picric acid; PA) via fluorescence quenching phenomenon among various nitroaromatic compounds through a chemodosimetric approach. It has been established that 1 is a chemodosimeter in pure water. We have successfully been able to isolate three compounds: chemodosimeter 1 ; an intermediate complex 2 of composition [CdII(LH2)Cl2](Picrate) and final association complex 3 of composition [NH3(CH2CH2)NH2CH3](Picrate)2. Compounds have been characterised by CHN elemental analyses, single crystal X-ray crystallography, PXRD, NMR and FTIR. Selective interaction of 1 with PA was evaluated by fluorescence, UV-Vis and life time measurements. Fluorescence quenching of 1 occurs definitely due to the formation of compound 3 via intermediate 2 involving partial decomplexation, hydrolysis and proton transfer phenomena in solution during the course of sensing. The quenching constant (Ksv), association constant (Ka) and detection limit (LOD) of the complex 1 for picric acid are ∼1.55×105 M−1, ∼1.8×1010 M−2 and ∼0.47 μM (0.108 ppm), respectively. Mechanism of sensing is proposed and the very rare case of isolation and characterization of intermediate in picric acid sensing is discussed. 相似文献
118.
119.
Syntheses, structures, and electrochemistry of a dialkoxo‐bridged diuranyl(VI) compound [(UO2)2(L1)2(dimethylformamide)2] ( 1 ) and a mononuclear–mononuclear cocrystalline compound [(UO2)(L2)(H2O)⊂(H2O)]·[(UO2)(L2)(H2O)] ( 2 ) derived from Schiff base ligands are reported (H2L1 = Schiff base ligand obtained on condensation of 3‐ethoxysalicylaldehyde with 2‐aminoethanol; H2L2 = N,N ′‐o ‐phenylenebis(3‐ethoxysalicylaldimine)). The compounds 1 and 2 crystallize in the space groups P 21/c and P 1, respectively. Compound 1 is a dialkoxo‐bridged dinuclear compound of uranium(VI) containing two deprotonated ligands, [L]2–, two dimethylformamide (dmf) molecules and two UO22+ centers. Three C–H···O type hydrogen bonds involving one uranyl oxygen, two dmf hydrogens, and the imine hydrogen link the dinuclear units into a two‐dimensional network. Compound 2 is a cocrystal of two mononuclear units, [(UO2)(L2)(H2O)⊂(H2O)] (unit 1) and [(UO2)(L2)(H2O)] (unit 2). In unit 1, the non‐coordinated water molecule forms hydrogen bonds with oxygens of phenoxo, ethoxy, and coordinated water molecules resulting in the formation of an inclusion product. The overall supramolecular structure of compound 2 is one‐dimensional and consists of interlinked self‐assembled dimeric unit of unit 1 and unit 2. Cyclic voltammetric measurements reveal that the uranium(VI) center in [(UO2)2(L1)2(dimethylformamide)2] ( 1 ) is reduced quasireversibly at E1/2 = –773 mV with ΔEP = 121 mV, while the metal center in [(UO2)(L2)(H2O)⊂(H2O)]·[(UO2)(L2)(H2O)] ( 2 ) is reduced reversibly with E1/2 = –765 mV with ΔEP = 68 mV. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献