of oxides and oxoacids of phosphorus
phosphorous trioxide, phosphorous tetra oxide and phosphorous pentaoxides
In phosphorous trioxide
four phosphorous atoms lie at the corners of a tetrahedron and six oxygen atoms
along the edges. The P-O bond distance is 165.6 pm which is shorter than the
single bond distance of P-O (184 pm) due to pπ-dπ bonding and results in
considerable double bond character.
each P atoms form three bonds to oxygen atom and also an additional coordinate
bond with an oxygen atom.
Terminal coordinate P-O
bond length is 143 pm, which is less than the expected single bond distance.
This may be due to lateral overlap of filled p orbitals of an oxygen atom with
empty d orbital on phosphorous.