How does P(CX2HX5)X3 acts as a ligand and forms dπ-dπ bonds with transition elements. Why not pπ-dπ bond?
I understand that transition elements have d subshell available to accept electrons. But what about the electrons from phosphorus? From Chemistry Class 12 (NCERT), Part 1, p. 168.:
Another factor which affects the chemistry of nitrogen is the absence of d orbitals in its valence shell. Besides restricting its covalency to four, nitrogen cannot form dπ-pπ bond as the heavier elements can e.g., RX3P=O or RX3P=CHX2 (R = alkyl group). Phosphorous and arsenic can form dπ-dπ bond also with transition metals when their compounds like P(CX2HX5)X3 and As(CX6HX5)X3 act as ligands.
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