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1,4-Dienes isomerize to the 1,3-dienes upon complexation. [13] Fe(CO) 5 reacts in dicyclopentadiene to form [Fe(C 5 H 5)(CO) 2] 2, cyclopentadienyliron dicarbonyl dimer. This compound, called "Fp dimer" can be considered a hybrid of ferrocene and Fe(CO) 5, although in terms of its reactivity, it resembles neither.
In chemistry, the molar mass (M) (sometimes called molecular weight or formula weight, but see related quantities for usage) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound. [1] The molar mass is a bulk, not molecular, property of a substance.
2 instead of Fe (ClO 4) 2) at 0.2 M to prepare amorphous FeCO 3. [7] Care must be taken to exclude oxygen O 2 from the solutions, because the Fe 2+ ion is easily oxidized to Fe 3+, especially at pH above 6.0. [6] Ferrous carbonate also forms directly on steel or iron surfaces exposed to solutions of carbon dioxide, forming an "iron carbonate ...
C 4 H 2 Fe O 4: Molar mass: 169.901 g·mol −1 Appearance reddish-brown powder Odor: odorless Density: 2.435 g/cm 3 (20 °C) Melting point: 280 °C (536 °F; 553 K)
In the case of Fe(Et 2 dtc) 3, X-ray crystallography reveals that the Fe-S bonds are 231 pm at 79K but 356 pm at 297 K. These data indicate a low-spin configuration at low temperatures and a high spin configuration near room temperature.
There are 28 known radioisotopes and 8 nuclear isomers, the most stable of which are 60 Fe (half-life 2.6 million years) and 55 Fe (half-life 2.7 years). Much of the past work on measuring the isotopic composition of iron has centered on determining 60 Fe variations due to processes accompanying nucleosynthesis (i.e., meteorite studies) and ore ...
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Of these stable isotopes, only 57 Fe has a nuclear spin (− 1 ⁄ 2). The nuclide 54 Fe theoretically can undergo double electron capture to 54 Cr, but the process has never been observed and only a lower limit on the half-life of 4.4×10 20 years has been established. [22] 60 Fe is an extinct radionuclide of long half-life (2.6 million years ...