Name: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Mixed-Ligand Approach to Changing the Metal Ratio in Bismuth-Transition Metal Heterometallic Precursors. Author is Lieberman, Craig M.; Wei, Zheng; Filatov, Alexander S.; Dikarev, Evgeny V..
A new series of heteroleptic bismuth-transition metal β-diketonates [BiM(hfac)3(thd)2] (M = Mn (1), Co (2), and Ni (3); Hhfac = hexafluoroacetylacetonate, Hthd = tetramethylheptanedionate) with Bi:M = 1:1 ratio have been synthesized by stoichiometric reactions between homometallic reagents [BiIII(hfac)3] and [MII(thd)2]. On the basis of anal. of the metal-ligand interactions in heterometallic structures, the title compounds were formulated as ion-pair {[BiIII(thd)2]+[MII(hfac)3]-} complexes. The direct reaction between homometallic reagents proceeds with a full ligand exchange between main group and transition metal centers, yielding dinuclear heterometallic mols. In heteroleptic mols. 1-3, the Lewis acidic, coordinatively unsaturated BiIII centers are chelated by two bulky, electron-donating thd ligands and maintain bridging interactions with three oxygen atoms of small, electron-withdrawing hfac groups that chelate the neighboring divalent transition metals. Application of the mixed-ligand approach allows one to change the connectivity pattern within the heterometallic assembly and to isolate highly volatile precursors with the proper Bi:M = 1:1 ratio. The mixed-ligand approach employed in this work opens broad opportunities for the synthesis of heterometallic (main group-transition metal) mol. precursors with specific M:M’ ratio in the case when homoleptic counterparts either do not exist or afford products with an incorrect metal:metal ratio for the target materials. Heteroleptic complexes obtained in this study represent prospective single-source precursors for the low-temperature preparation of multiferroic perovskite-type oxides.
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