Isatin-1,8-Naphthalimide Hydrazones: A Study of Their Sensor and ON/OFF Functionality

Five novel hydrazones derived from substituted isatins were synthesized as potential anion sensors. Using UV-VIS, FTIR, NMR and fluorescence spectroscopy, these compounds’ tautomeric equilibrium and Z-E photoisomerization were studied in DMF and CHCl3, depending on the hydrazone concentrations, the presence of basic anions and light stimulation. Anion recognition aspects (PF6−, HSO4−, Br−, Cl−, NO3−, F− and CH3COO−) and these receptors’ detection limits were also studied. We also tested the light-stimulated ON-OFF functionality of these compounds in the presence or absence of these anions.

Download Full-text

Ultra-low detection limits for an organic dye determined by fluorescence spectroscopy with laser diode excitation

Analytical Chemistry ◽

10.1021/ac00183a016 ◽

1989 ◽

Vol 61 (8) ◽

pp. 861-863 ◽

Cited By ~ 34

Author(s):

Paul A. Johnson ◽

Tye E. Barber ◽

Benjamin W. Smith ◽

James D. Winefordner

Keyword(s):

Fluorescence Spectroscopy ◽

Laser Diode ◽

Detection Limits ◽

Organic Dye

Download Full-text

Optical Anion Sensors Based on Alkyne-Linked, Functionalized Calix[4]pyrroles

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20041027 ◽

2004 ◽

Vol 69 (5) ◽

pp. 1027-1049 ◽

Cited By ~ 14

Author(s):

Hidekazu Miyaji ◽

Wataru Sato ◽

Deqiang an ◽

Jonathan L. Sessler

Keyword(s):

Fluorescence Quenching ◽

Anion Recognition ◽

Organic Media ◽

Anion Sensor ◽

New Class ◽

Naked Eye ◽

Anion Sensors ◽

Phosphate Anions

Linking a calix[4]pyrrole anion recognition subunit to chromophores or fluorophores via an alkynyl spacer attached to a β-pyrrolic position of a calix[4]pyrrole core produces a new class of anion sensor that permits the detection of halide and phosphate anions in organic media via direct, so-called "naked-eye" visualization or fluorescence quenching-based spectroscopic means.

Download Full-text

Some Detection Limits in Atomic Fluorescence Spectroscopy with Micro Wave Excited Elsctrodeless Discharge Tubes as Excitation Sources

Spectroscopy Letters ◽

10.1080/00387016808049998 ◽

1968 ◽

Vol 1 (12) ◽

pp. 397-405 ◽

Cited By ~ 35

Author(s):

R. M. Dagnall ◽

M. R. G. Taylor ◽

T. S. West

Keyword(s):

Fluorescence Spectroscopy ◽

Detection Limits ◽

Atomic Fluorescence ◽

Atomic Fluorescence Spectroscopy ◽

Discharge Tubes

Download Full-text

Antimony speciation in soils: Improving the detection limits using post-column pre-reduction hydride generation atomic fluorescence spectroscopy (HPLC/pre-reduction/HG-AFS)

Talanta ◽

10.1016/j.talanta.2011.01.018 ◽

2011 ◽

Vol 84 (2) ◽

pp. 593-598 ◽

Cited By ~ 16

Author(s):

Waldo Quiroz ◽

David Olivares ◽

Manuel Bravo ◽

Jorg Feldmann ◽

Andrea Raab

Keyword(s):

Fluorescence Spectroscopy ◽

Hydride Generation ◽

Detection Limits ◽

Atomic Fluorescence ◽

Atomic Fluorescence Spectroscopy ◽

Antimony Speciation

Download Full-text

Quantitative parallel EELS spectrum imaging developed as a new tool in AEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013064x ◽

1992 ◽

Vol 50 (2) ◽

pp. 1202-1203

Author(s):

Gianluigi Botton ◽

Gilles L'espérance

Keyword(s):

Statistical Analysis ◽

Spatial Resolution ◽

Personal Computer ◽

Systematic Study ◽

Present Author ◽

Chemical Elements ◽

Detection Limits ◽

Research Groups ◽

Quantitative Performance ◽

Spectrum Imaging

As interest for parallel EELS spectrum imaging grows in laboratories equipped with commercial spectrometers, different approaches were used in recent years by a few research groups in the development of the technique of spectrum imaging as reported in the literature. Either by controlling, with a personal computer both the microsope and the spectrometer or using more powerful workstations interfaced to conventional multichannel analysers with commercially available programs to control the microscope and the spectrometer, spectrum images can now be obtained. Work on the limits of the technique, in terms of the quantitative performance was reported, however, by the present author where a systematic study of artifacts detection limits, statistical errors as a function of desired spatial resolution and range of chemical elements to be studied in a map was carried out The aim of the present paper is to show an application of quantitative parallel EELS spectrum imaging where statistical analysis is performed at each pixel and interpretation is carried out using criteria established from the statistical analysis and variations in composition are analyzed with the help of information retreived from t/γ maps so that artifacts are avoided.

Download Full-text

Analysis of completed commercial semiconductors using EPMA

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100164970 ◽

1996 ◽

Vol 54 ◽

pp. 502-503

Author(s):

R. Packwood ◽

M.W. Phaneuf ◽

V. Weatherall ◽

I. Bassignana

Keyword(s):

Electron Probe Microanalysis ◽

Electron Probe ◽

Semiconductor Industry ◽

Detection Limits ◽

High Technology ◽

Depth Resolution ◽

Analytical Instruments ◽

Wide Range ◽

Numerous Element ◽

Choice Method

The development of specialized analytical instruments such as the SIMS, XPS, ISS etc., all with truly incredible abilities in certain areas, has given rise to the notion that electron probe microanalysis (EPMA) is an old fashioned and rather inadequate technique, and one that is of little or no use in such high technology fields as the semiconductor industry. Whilst it is true that the microprobe does not possess parts-per-billion sensitivity (ppb) or monolayer depth resolution it is also true that many times these extremes of performance are not essential and that a few tens of parts-per-million (ppm) and a few tens of nanometers depth resolution is all that is required. In fact, the microprobe may well be the second choice method for a wide range of analytical problems and even the method of choice for a few.The literature is replete with remarks that suggest the writer is confusing an SEM-EDXS combination with an instrument such as the Cameca SX-50. Even where this confusion does not exist, the literature discusses microprobe detection limits that are seldom stated to be as low as 100 ppm, whereas there are numerous element combinations for which 10-20 ppm is routinely attainable.

Download Full-text

A preliminary study on the potential of front face fluorescence spectroscopy for the discrimination of Moroccan virgin olive oils and the prediction of their quality

Analytical Methods ◽

10.1039/d0ay01746a ◽

2021 ◽

Author(s):

Hicham Zaroual ◽

El Mestafa El Hadrami ◽

Romdhane Karoui

Keyword(s):

Fluorescence Spectroscopy ◽

Olive Oil ◽

Virgin Olive Oil ◽

Front Face ◽

Virgin Olive Oils ◽

Olive Oils ◽

Preliminary Study

This study examines the feasibility of using front face fluorescence spectroscopy (FFFS) to authenticate 41 virgin olive oil (VOO) samples collected from 5 regions in Morocco during 2 consecutive crop seasons.

Download Full-text