Anion Selective Recognition and Sensing by Novel Transition Metal Receptor Systems

1998 ◽  
pp. 97-102
Author(s):  
Paul D. Beer
Keyword(s):  
Transition Metal ◽  
Selective Recognition

Synthesis and Hg2+ Recognition of Novel Azobenzene Derivatives Bearing Heterocyclic Units

2012 ◽  
Vol 36 (3) ◽  
pp. 146-148
Author(s):  
Yan Gao ◽  
Jian Song ◽  
Wei Wang
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Elemental Analysis ◽  
Fluorescence Spectra ◽  
Transition Metal Ions ◽  
Selective Recognition ◽  
H Nmr ◽  
Azobenzene Derivatives ◽  
C Nmr

Four novel azobenzene derivatives, 4,4'-bis(CH2SAr)azobenzene (Ar = different heterocyclic units), have been prepared and characterised by IR, 1H NMR, 13C NMR, MS and elemental analysis. Their complexation properties to different heavy and transition metal ions have been studied by UV and fluorescence spectra. The compound 4,4'-bis(4,6-dimethyl-pyrimidine-2-ylmethylthio)azobenzene shows selective recognition of Hg2+.

Selective recognition of carbonic anhydrase using transition metal complexes

2000 ◽  
pp. 547-548 ◽  
Author(s):  
Bidhan C. Roy ◽  
Md. Abul Fazal ◽  
Shuguang Sun ◽  
Sanku Mallik
Keyword(s):  
Transition Metal ◽  
Carbonic Anhydrase ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Selective Recognition

Metal-assisted selective recognition of biothiols by a synthetic receptor array

2018 ◽  
Vol 54 (93) ◽  
pp. 13147-13150 ◽  
Author(s):  
Yang Liu ◽  
Yaokai Duan ◽  
Adam D. Gill ◽  
Lizeth Perez ◽  
Qiaoshi Jiang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Small Molecule ◽  
Aqueous Media ◽  
Transition Metal Ions ◽  
Selective Recognition ◽  
Good Efficiency ◽  
Synthetic Receptor ◽  
Biological Interest ◽  
Receptor Array

A synergistic combination of a deep cavitand host, fluorophore guests and transition metal ions can be used to sense small molecule thiols of biological interest with good efficiency and selectivity in complex aqueous media.

Anion Selective Recognition and Sensing by Novel Macrocyclic Transition Metal Receptor Systems.1H NMR, Electrochemical, and Photophysical Investigations

1997 ◽  
Vol 119 (49) ◽  
pp. 11864-11875 ◽  
Author(s):  
Paul D. Beer ◽  
Fridrich Szemes ◽  
Vincenzo Balzani ◽  
Claudio M. Salà ◽  
Michael G. B. Drew ◽  
...  
Keyword(s):  
Transition Metal ◽  
1H Nmr ◽  
Selective Recognition

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

1992 ◽  
Vol 50 (2) ◽  
pp. 1624-1625
Author(s):  
Michel Fialin ◽  
Guy Rémond
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Electrostatic Charge ◽  
Carbon Layer ◽  
Sample Holder ◽  
Rock Matrix ◽  
Electrical Discharges ◽  
Thin Carbon ◽  
Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

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