HPLC of Formula: 14481-08-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about High-pressure mass spectra and gaseous ion chemistry of metal β-diketonates with bulky substituents. Author is Schildcrout, Steven M..
Mass spectra at normal and elevated pressures are reported and interpreted for chelates of the 2,2,6,6-tetramethyl-3,5-heptanedione anion with Cr(III), Fe(III), Co(II), Co(III), Ni(II), Cu(II), Zn(II), and Al (III). At the higher pressures in each case primary pos. fragment ions undergo gaseous bimol. reaction with the neutral mononuclear complexes to form heavier polynuclear pos. ions, usually with unfragmented ligands. These are analogous to those previously observed for chelates of sterically less hindered β-diketone ligands. Competing with the association reaction in most cases is charge transfer between fragment ions and the neutral complex. Although they prevent intermol. association in condensed phases, the tert-Bu groups on the present complexes hinder, but do not prevent, gaseous ion-neutral association in the tetrahedral and octahedral complexes. No significant hindrance was observed for the planar complexes. The tert-Bu substituents tend also to enhance charge transfer. In the absence of steric hindrance and charge transfer, the tendency to undergo ion-neutral association follows the polarizability or basicity of the ligand. The tendency of the metal to maintain its preferred oxidation state determines which of the possible polynuclear ions will form. These heavy ions are probably Lewis acid-base complexes rather than van der Waals complexes.
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Reference:
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