  The process $e^{+}e^{-} \to \phi \eta^{\prime}$ has been studied for the
first time in detail using data sample collected with the BESIII detector at
the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A
resonance with quantum numbers $J^{PC}=1^{--}$ is observed with mass $M$ =
(2177.5 $\pm$ 4.8 (stat) $\pm$ 19.5 (syst)) MeV/${ \it{c}^{\mathrm{2}}}$ and
width $\Gamma$ = (149.0 $\pm$ 15.6 (stat) $\pm$ 8.9 (syst)) MeV with a
statistical significance larger than 10$\sigma$. The observed structure could
be identified with the $\phi(2170)$, then the ratio of partial width between
the $\phi \eta^{\prime}$ by BESIII and $\phi \eta$ by BABAR is
($\mathcal{B}^{R}_{\phi \eta}\Gamma^{R}_{ee})/{(\mathcal{B}^{R}_{\phi
\eta^{\prime}}\Gamma^{R}_{ee})}$ = 0.23 $\pm$ 0.10 (stat) $\pm$ 0.18 (syst),
which is smaller than the prediction of the $s\bar{s}g$ hybrid models by
several orders of magnitude.
