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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There are several factors that contribute to the broadening of absorption events by transition metals. Through changes in vibrational and energy states of the particles and the interaction between these vibrations with the instrument itself, a single absorption even will take place across a range of wavelengths.
The transformation of C[O.sub.2] in solution and in particular its reduction to CO through the assistance the of transition metal complexes as electrocatalysts have been comprehensively studied and reviewed [42,45,60-65].
where [W.sub.cal] is the calculated mass of the oil shale or kerogen sample mixed with transition metal salts at time t, %; [W.sub.os-ker] is the mass of the individual oil shale or kerogen sample at time t, %; [W.sub.salt] stands for the mass of the pure metal salt at time t, %; a denotes the initial mass percentage of oil shale or kerogen in the mixture; b signifies the initial mass percentage of metal salts in the mixture where a + b = 1.
Cobalt, the core transition metal of cobalamin (vitamin B12) is an absolute requirement for mammals to prevent the potentially lethal pernicious anemia, yet is not required by plants.
In this work, the researchers produced paper for special applications using transition metals, cellulose derivatives, and fillers in the presence of fluorescent dye.
patent claims a radioactive transition metal stent with a chemically bound radioactive surface and a methodology for forming a radioactive transition metal metaphoshate and phosphide stent surface.
Transition metal compatibilization of polymer-ionomer blends occurs when ligands on two immiscible polymers coordinate to a single metal center.
The binary transition metal complex was impregnated to -Al2O3 to prepare hydrodesulfurization catalyst.
They cover various topics: transition metal catalysis for organic synthesis, applying organocatalysis in sustainable synthesis, learning from biology: biomimetic catalysis, biocatalytic solutions for green chemistry, Montmorillonite clays as heterogeneous catalysts for organic reactions, harnessing solar energy: transition metal catalysts for the water oxidation process, and life cycle thinking to inform catalysis choice and green chemistry.
Although norbornene monomers are polymerized with transition metal catalysts, polar groups deactivate these catalysts, making polymerization of monomers with polar groups impossible.

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