Which of the following complexes are chiral?
(a) Pt(en)Cl₂
(b) cis-[Co(NH₃)₄Br₂]+
(c) cis-[Cr(en)₂(H₂O)₂]³⁺
(d) [Cr(C₂O₄)₃]^3-

검증된 단계별 안내

Identify the geometry of each complex. For example, determine if the complex is octahedral, square planar, or tetrahedral.

Determine if the complex has a plane of symmetry or a center of symmetry. A chiral complex will lack these symmetries.

For each complex, consider the ligands and their arrangement around the central metal atom. Check if swapping any two ligands results in a non-superimposable mirror image.

Examine the specific ligands: 'en' (ethylenediamine) is a bidentate ligand that can create chiral centers, while 'C2O4' (oxalate) is also bidentate but can form symmetrical structures.

Analyze each complex: (a) Pt(en)Cl2 is square planar and typically not chiral; (b) cis-[Co(NH3)4Br2]+ is octahedral and can be chiral if it lacks symmetry; (c) cis-[Cr(en)2(H2O)2]3+ is octahedral and can be chiral due to the arrangement of bidentate ligands; (d) [Cr(C2O4)3]3- is octahedral and typically not chiral due to symmetrical arrangement of oxalate ligands.

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주요 개념

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Chirality

Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image, much like left and right hands. A chiral molecule typically has an asymmetric carbon atom, but in coordination complexes, chirality can arise from the arrangement of ligands around a central metal atom. Identifying chirality is crucial for understanding the optical activity and potential biological interactions of the complexes.

Coordination Complexes

Coordination complexes consist of a central metal atom bonded to surrounding molecules or ions called ligands. The geometry of these complexes can vary, influencing their properties, including chirality. Understanding the coordination number and the spatial arrangement of ligands is essential for determining whether a complex is chiral or achiral.

Geometric Isomerism

Geometric isomerism occurs when compounds have the same molecular formula but differ in the spatial arrangement of their atoms. In coordination chemistry, this can manifest as cis and trans isomers, which can have different properties, including chirality. Recognizing these isomers is vital for analyzing the chirality of the given complexes in the question.

Which of the following complexes are chiral?(a) Pt(en)Cl2(b) cis-[Co(NH3)4Br2]+(c) cis-[Cr(en)2(H2O)2]3+(d) [Cr(C2O4)3]3-