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why is coordination number of bis( acetylacetonato) copper 2 is different from that of tris (acetylacetonato)...

why is coordination number of bis( acetylacetonato) copper 2 is different from that of tris (acetylacetonato) chromium 3?
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Ans: The copper(II) ion binds with two units of anionic acetylacetone ligands, each of the ligand bonding with the copper ion and forms a six-membered chelate ring. The keto and enol form of acetylacetone coexist in solution. Besides, there are electrons delocalize at the double bond of a ligand which makes the complex more stable. Bis(acetylacetonato)copper(II) shows square-planar geometry

Chromium(III) forms stable with three units of anionic acetylacetone ligands, each of the ligand bonding with the chromium ion and forms a six-membered chelate ring. Due to its high crystal field stabilization energy, reactions of chromium(III) ion are slow and once Cr(acac)3 is formed it remains unreacted and Tris(acetylacetonato)chromium(III) shows octahedral geometry

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