نتایج جستجو برای: niii determination
تعداد نتایج: 251331 فیلتر نتایج به سال:
a novel silver (ag) nanocomposite electrode was proposed that fabricated from metal nanostructures and ionic liquids. the combined application of unique properties of nanomaterials and ionic liquids in the design of this ag nanocomposite results in electrodes with interesting advantages compared to the conventional metal disk electrode. in the first part of this thesis, the elecrocatalytic eff...
Covalent organic frameworks (COFs) have received broad interest owing to their permanent porosity, high stability, and tunable functionalities. COFs with long-range π-conjugation photosensitizing building blocks been explored for sustainable photocatalysis. Herein, we report the first example of COF-based energy transfer Ni catalysis. A pyrene-based COF sp2 carbon-conjugation was synthesized us...
a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...
fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...
Interacting supernovae (SNe) IIn and Ibn show narrow emission lines have always been a mysterious unsolved genre in SNe physics. We present comprehensive analysis of the temporal spectroscopic behaviour group interacting SNe~IIn Ibn. choose SNe~2012ab, 2020cui, 2020rc 2019uo as representative members these SN sub-types to probe nature explosion. Our study reveals that are heterogeneous, bright ...
3,7,23,27-Tetrabromo[36]octaphyrin 2 was synthesized as a novel octaphyrin bearing two meso-free positions. Surprisingly, its ZnII and NiII complexation reactions produced directly fused porphyrin(2.1.1.1) dimer 6, meso-α N-confused porphyrin (NCP) 7, the first example of NCP tape, respectively, via transannular C−C bond formation. While 6 exhibits diatropic ring-current effect owing to global ...
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