Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 13940-83-5, is researched, Molecular F2H8NiO4, about MF2 vibrations and librations of water molecules in the series MF2 · 4H2O (M = iron, cobalt, nickel or zinc), the main research direction is metal transition difluoride tetrahydrate IR spectra; vibration spectra transition metal difluoride tetrahydrate; libration water transition metal difluoride tetrahydrate; crystal structure transition metal difluoride tetrahydrate; fluoride transition metal tetrahydrate IR spectra; bond angle length polarity metal difluoride.Electric Literature of F2H8NiO4.
The IR absorption spectra of the series MF2·4H2O (M = Fe, Co, Ni, or Zn) and of the resp. deuterates were recorded at 296 K and ∼100 K in the 1200-1400 cm-1 wavenumber region. Using the known ZnF2·4H2O structure as a model, the number of IR active librations and MF2 vibrations was predicted with the aid of a group theor. treatment. The librations were distinguished from the MF2 and M-O vibrations and assigned, using isotopic ratios and correlations between the unit cell volumes, the uncoupled O-H and O-D stretch vibrations of HDO, and the twisting libration. The six librations are assigned to types of water mols. with low symmetry and with different hydrogen bond strengths, and are compatible with an orthorhombic Pca21 structure. The ν1 and ν3 intramol. MF2 vibrations are assigned, using ZnF2·4H2O crystal data and matrix-isolated ν1 and ν3 (ν1,3) values as guide. Shifts of ν1,3 and ν1/ν3 relative to the matrix-isolated values suggest smaller M-F bond lengths. The shifts in the values of ν1,3 and ν1/ν3 upon deuteration and lowering of the temperature indicate smaller M-F bond lengths and F-M-F angles.
In addition to the literature in the link below, there is a lot of literature about this compound(Nickel(ii)fluoridetetrahydrate)Electric Literature of F2H8NiO4, illustrating the importance and wide applicability of this compound(13940-83-5).
Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider