Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Nickel(ii)fluoridetetrahydrate, is researched, Molecular F2H8NiO4, CAS is 13940-83-5, about Chemical shifts observed in Lα X-ray emission lines of elements in the range of 26 ≤ Z ≤ 30 in their halogen compounds.Reference of Nickel(ii)fluoridetetrahydrate.
The chem. shifts and full widths at half maximum intensity of Lα x-ray emission lines of elements in the range 26 ≤ Z ≤ 30 were studied in their halogen compounds using a wavelength-dispersive X-ray fluorescence spectrometry. The chem. shifts for F based compounds are higher than that of Cl and Br based compounds
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Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider