The structure of ${\mathrm{PCl}}_5$  in the solid state is

 Square pyramidal 

 Tetrahedral [PC14 i+ and octahedral  ${\left[{\mathrm{PCl}}_6\right]}^{-}$

Trigonal bipyramidal 

Square planar ${\left[{\mathrm{PCl}}_4\right]}^{+}\text{and octahedral }{\left[{\mathrm{PCl}}_6\right]}^{-}$