Acetylacetone, abbreviated acacH, is a bidentate ligand. It...

Acetylacetone, abbreviated acacH, is a bidentate ligand. It loses a proton and coordinates as acac $^{-},$ as shown below, where $\mathrm{M}$ is a transition metal: (IMAGE NOT COPY) Which of the following complexes are optically active: cis$\mathrm{Cr}(\mathrm{acac})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2},$ trans- $\mathrm{Cr}(\mathrm{acac})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2},$ and $\mathrm{Cr}(\mathrm{acac})_{3} ?$

Acetylacetone, abbreviated acacH, is a bidentate ligand. It loses a proton and coordinates as acac $^{-},$ as shown below, where $\mathrm{M}$ is a transition metal:
(IMAGE NOT COPY)
Which of the following complexes are optically active: cis$\mathrm{Cr}(\mathrm{acac})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2},$ trans- $\mathrm{Cr}(\mathrm{acac})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2},$ and $\mathrm{Cr}(\mathrm{acac})_{3} ?$

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Key Concepts

Coordination Geometry

This concept refers to the spatial arrangement of atoms or groups attached to a central metal ion in a complex. The overall geometry (octahedral, tetrahedral, square planar, etc.) of coordination compounds is critical in determining their symmetry, which in turn influences properties like optical activity.

Optical Isomerism

Optical isomerism occurs when a compound can exist as a pair of non-superimposable mirror images, known as enantiomers. In coordination chemistry, enantiomerism arises when the complex lacks certain symmetry elements, such as a mirror plane or center of inversion, allowing it to rotate plane-polarized light.

Chelation and Bidentate Ligands

Chelation involves ligands that bind to a central metal ion through two or more donor atoms, forming ring structures. Bidentate ligands, which use two donor atoms for coordination, can create specific rigid geometries that often contribute to the formation of chiral centers in complexes.

Geometric Isomerism (cis/trans Isomerism)

Geometric isomerism in coordination compounds, such as cis and trans configurations, involves different spatial arrangements of the same set of ligands. These arrangements can lead to differences in symmetry, enabling some isomers to be optically active while others remain achiral.

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