Vol. 4, No. 10, October 1965
SYNTHESIS O F TETRAPHOSPHORUS TRISELENIDE 1421
establish the chelate structure the P-0-P stretch must be examined. The frequency shift of the P-0-P stretch in all cases except two is in the direction of higher frequency, which indicates a stronger bond or higher bond order. This may be explained by considering the structures P M
li5
":_
M 2+
x-P-bo-P-x llJ $11 I 1 x x
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