In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Bending modes of the water molecules and the M-O stretching modes in the series MF2.4H2O (M = iron, cobalt, nickel, zinc), published in 1991, which mentions a compound: 13940-83-5, Name is Nickel(ii)fluoridetetrahydrate, Molecular F2H8NiO4, Application In Synthesis of Nickel(ii)fluoridetetrahydrate.
The IR spectra of MF2.4X2O (M = Fe, Co, Ni, Zn; X = H, D) are reported in the frequency ranges of the bending vibrations of the H2O mols. (ν2) at 296 and ∼100 K and the M-O lattice vibrations (νM-O) at 296 K. Four νM-O vibrations consisting of 2 doublets are identified using D substitution. The various νZn-O vibrations correlate with the metal-O distances R(Zn-O), and this correlation is further used to calculate R(M-O)’s of the remainder of the series and to refine R(Zn-O). Four ν2(H2O, HDO, D2O) vibrations, consisting of 2 sharp overlapping bands flanked by 2 broad shoulders, are identified. The number of ν2(H2O) components, the sequence of ν2 in the series and the correlation with R(M-O) suggest that the ν2 frequencies are mainly determined by R(M-O). Using this assignment the 2 types of ν2 bands are assigned to the 2 types of crystallog. distinct H2O mols. found in the MF2.4H2O structure.
After consulting a lot of data, we found that this compound(13940-83-5)Application In Synthesis of Nickel(ii)fluoridetetrahydrate can be used in many types of reactions. And in most cases, this compound has more advantages.
Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider