COA of Formula: C22H38NiO4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Assignment of the electronic absorption spectra of bis(β-ketoenolate) complexes of copper(II) and nickel(II). Author is Cotton, F. Albert; Wise, John J..
The problem of the relative positions of the M.O. which are mainly metal d orbitals in sq. bis(β-ketoenolato)Cu(II) complexes was investigated by studying the polarizations of single-crystal spectra of Cu(DPM)2 at 25° (DPM represents the anion of 2,2,6,6-tetramethylheptane-3,5-dione, which has the common name dipivaloylmethane, DPM). The orientation of the mols. in the unit cell of this compound permits the complete sorting out of the polarization, something which is not possible in the prototype compound, bis(acetylacetonato)Cu(II). All 4 “”d-d”” transitions occur within a range of a few thousand wavenos. as predicted earlier by our L.C.A.O.-M.O. calculation This result is also in accord with though was not demanded by the E.S.R. data. A similar but less complete study of Ni(DPM)2 indicates that also in that mol. the dxz, dyz, dx2-y2, and dz2 orbitals lie close together, some 20,000 cm.-1 below the dxy orbital. The observed polarizations for Cu(DPM)2 are sufficient to rule out a magnetic dipole mechanism as the main source of intensity, but they do not, in themselves, provide a basis for assignment of the transitions if the intensity mechanism is taken to be a vibronic one. The assignment of the uv spectrum of Cu(DPM)2 is reviewed. Assignments previously proposed by Fackler, et al. are confirmed except that the band at 48,600 cm.-1 is now postulated to be a metal to ligand charge-transfer instead of a π → π* band. 35 references.
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