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We report the first results of relativistic correlation calculation of thespectroscopic properties for the ground state of E112H and its cation in whichspin-orbit interaction is taken into account non-perturbatively. Studying theproperties of E112 (eka-Hg) is required for chemical identification of itslong-lived isotope, $^{283}$112. It is shown that appropriate accounting forspin-orbit effects leads to dramatic impact on the properties of E112H whereasthey are not so important for E112H$^+$. The calculated equilibrium distance,$R_e^{calc}=1.662$ A, in E112H is notably smaller than$R_e^{expt}=(1.738\pm0.003)$ A and $R_e^{calc}=1.738$ A in HgH, whereas thedissociation energy, $D_e^{calc}=0.42$ eV, in E112H is close to$D_e^{expt}=0.46$ eV and $D_e^{calc}=0.41$ eV in HgH. These data are quitedifferent from $R_e^{NH}=1.829$ A and $D_e^{NH}=0.06$ eV obtained for E112Hwithin the scalar-relativistic Douglas-Kroll approximation [Nakajima and Hirao,Chem. Phys. Lett., 329, 511 (2000)]. Our results indicate that E112 should notbe expected to be "more inert" than Hg in opposite to the results by otherauthors.Comment: 11 pages, 1 table, the text of the paper was essentially improve

Is E112 a relatively inert element? Benchmark relativistic correlation study of spectroscopic constants in E112H and its cation