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

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

trigonal bipyramidal

square pyramidal

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