نتایج جستجو برای: fluorescence spectrometry

تعداد نتایج: 202470  

Journal: :Chemosensors 2022

Novel metal-free and Mg(II) [3/4-(3,4-dicyanophenoxy)phenoxy]-substituted phthalocyanines were obtained characterized using NMR, IR, UV-vis spectroscopy, mass spectrometry. This substitution provided compounds with good solubility in organic media, thus their spectroscopic fluorescent properties studied. The formation of the investigated phthalocyanine complexes central magnesium ions led to st...

Journal: :Analytical and bioanalytical chemistry 2012
L L Chaparro L Ferrer V Cerdà L O Leal

A multisyringe flow-injection approach has been coupled to hydride generation-atomic fluorescence spectrometry (HG-AFS) with UV photo-oxidation for dimethylarsinic (DMA), inorganic As and total As determination, depending on the pre-treatment given to the sample (extraction or digestion). The implementation of a UV lamp allows on-line photo-oxidation of DMA and the following arsenic detection, ...

Journal: :Physical review letters 2014
L Schroedter M Müller A Kickermann A Przystawik S Toleikis M Adolph L Flückiger T Gorkhover L Nösel M Krikunova T Oelze Y Ovcharenko D Rupp M Sauppe D Wolter S Schorb C Bostedt T Möller T Laarmann

Highly charged ions are formed in the center of composite clusters by strong free-electron laser pulses and they emit fluorescence on a femtosecond time scale before competing recombination leads to neutralization of the nanoplasma core. In contrast to mass spectrometry that detects remnants of the interaction, fluorescence in the extreme ultraviolet spectral range provides fingerprints of tran...

Journal: :Frontiers in chemistry 2015
Sasha Wagner Rudolf Jaffé Kaelin Cawley Thorsten Dittmar Aron Stubbins

Optical properties are easy-to-measure proxies for dissolved organic matter (DOM) composition, source, and reactivity. However, the molecular signature of DOM associated with such optical parameters remains poorly defined. The Florida coastal Everglades is a subtropical wetland with diverse vegetation (e.g., sawgrass prairies, mangrove forests, seagrass meadows) and DOM sources (e.g., terrestri...

Journal: :Chemical communications 2015
Ji-Na Hao Bing Yan

A lanthanide-functionalized MOF with extremely high water tolerance was developed as a fluorescent probe for hippuric acid (HA) in urine which is considered as the biological indicators of toluene exposure. For the first time, the urinary HA was detected by fluorescence spectrometry based on a recyclable Ln-MOF sensor.

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2013
Lin Xue Yan Shi Liangliang Zhang Xiyou Li

A perylenetetracarboxylic diimide hexamer (6PDI) and a dimer (2PDI) linked with the same hexaphenylbenzene group were prepared, and the structures were fully characterized by (1)H NMR spectroscopy, mass spectrometry, and elemental analysis. Due to the similar molecular structure of these two compounds, similar interactions between/among the PDI subunits as well as similar photophysical properti...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2003
Shoji Kurata Masatoshi Nagai

The emission spectra of luminescent trivalent europium (Eu3+) and terbium (Tb3+) complexes were measured using a microscope laser Raman spectrometer with a doubled Nd:YAG laser (532 nm) and an Ar laser (488 nm). Excitation at 532 and 488 nm corresponded to wavelengths of the 7F1 --> 5D1 band of Eu3+ and the 7F6 --> 5D4 band of Tb3+, respectively. The Eu3+ and Tb3+ complexes were discriminated b...

Journal: :The Analyst 2015
Biao Gu Liyan Huang Naxiu Mi Peng Yin Youyu Zhang Xinman Tu Xubiao Luo Shenlian Luo Shouzhuo Yao

A novel ratiometric fluorescent Hg(2+) detecting system was rationally developed based on the typical excited state intramolecular proton transfer (ESIPT) characteristic of the latent fluorophore, 2-(1-(p-tolyl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenol (Pol) and the Hg(2+)-mediated cleavage of the vinyl group. The probe responds selectively to Hg(2+) over various other metal ions with a larger...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید