transition metal


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transition metal

One of a series of chemical elements that have properties that exhibit a change from more metallic properties (metals) to less metallic properties (nonmetals) as one moves from left to right in the periodic table of elements. For example, many of the elements between calcium and arsenic display this phenomenon, e.g., titanium, chromium, and manganese.
See also: metal
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Relatively high concentrations of total and free transition metals (mainly Fe and Cu) in the CNS predispose to Fenton-mediated hydroxyl radical formation and cytotoxicity.
g] might be rationalized by a change in conformation or tertiary structure, which is induced by the addition of transition metal chlorides.
KEY WORDS: air pollution, chemical properties, hospital admissions, multipollutant analysis, transition metals.
Researchers from University of Warwick and the University of Leeds have shown that a range of compounds containing the two transition metals, which are found in the same part of the periodic table as precious metals like platinum and gold, causes significant cell death in ovarian and colon cancer cells.
The State of Liberty is covered with copper, a transition metal.
Their specific topics include transition metal catalysts for syndiotactic polystyrene, crystallization thermodynamics and kinetics, commercial production processes, melt processing, blends with polyamide, and nanocomposites based on syndiotactic polystyrene.
In the absence of molecular oxygen, the reactions of ascorbic acid with certain transition metal ions, especially Fe(III), Cu(II), mercury(II) [Hg(II)], or Cr(VI), result in their reduction and oxidation of ascorbic acid to DHA, for example, 2Fe(III) + ascorbic acid [right arrow] 2Fe(II) + DHA + [2H.
Ziegler has been instrumental in the development of density functional theory as a practical tool in chemistry with special emphasis on transition metal complexes and homogeneous catalysis.
Additionally, it is also known that metal-containing liquid crystals in the form of metal binuclear carboxylates can be readily formed from the simple interaction of long chain sodium carboxylates and simple transition metal salts such as copper sulfate (ref 14).
Volume 76 in the venerable Organic Reactions series comprises three chapters that cover the ever-increasing emphasis of transition metal catalysis in organic synthesis.
Raman spectrometer with excitation laser in the near IR region to track vibration linkages metal - oxygen in the spectral region below 1100 cm-1, which provides information about the nature oxokomplexu transition metal functioning as active centers of catalysts studied.
After a historical introduction to the field, the second chapter introduces general principles of coordination chemistry, common biological ligands, and electron spin states in transition metal ions.

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