Considering the quadrupolar nature of $\mathrm{M}-\mathrm{M}$ bond in $\left[\mathrm{Re}_{2}\mathrm{Cl}_{8}\right]^{2-}$, the $\mathrm{M}-\mathrm{M}$ bond order in $\left[\mathrm{Re}_{2}\mathrm{Cl}_{4}\left(\mathrm{PMe}_{2}\mathrm{Ph}\right)_{4}\right]^{+}$ and $\left[\mathrm{Re}_{2}\mathrm{Cl}_{4}\left(\mathrm{PMe}_{2}\mathrm{Ph}\right)_{4}\right]$ respectively are