IGNOU MCH 11 2026 2027 - With the help of suitable diagram explain the Tolman cone angle in pho

Question

With the help of suitable diagram explain the Tolman cone angle in phosphines.

17 Jul 2026

Answer :

Word Count : 298

The Tolman cone angle is an important steric parameter used to describe the size or steric bulk of phosphine ligands in coordination chemistry. It was introduced by C. A. Tolman to compare the spatial demand of different tertiary phosphines, PR₃, when they coordinate to a metal atom. The cone angle helps in understanding the effect of ligand bulk on the geometry, stability, and reactivity of transition metal complexes. The cone angle (θ) is defined as the apex

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