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The orthorhombic crystal structure of the novel molecular-inorganic polymer$\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$ was elucidated using single-crystalX-ray diffraction with MoK$\alpha$ radiation ($\lambda$= 0.71073 {\AA}),performed at 100 and 298.15 K. The reported data is at 100 K since there wereno structural differences as compared to the room temperature. The techniquerevealed $\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$ crystals to have space group$Pbcm$ with unit cell dimensions $a =$ 8.8672(17) {\AA}, $b =$ 7.3355(14){\AA}, $c =$ 11.999(2) {\AA} and $Z =$ 4. The unit cell volume obtained was $V=$ 780.5(3) {\AA}$^3$ with a calculated density $D_{c} = 2.980 Mg/m^3$. In$\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$, the selenate anions and selenousacid molecules form an infinite polymeric chain along the \textit{c} axis,through strong hydrogen bonds. That is to say; there are two distinctivespecies forming a polymeric sequence extended along the \textit{c} axis with analternating molecule-anion-molecule $\mathrm{(SeO_{4}^{2-}-H_{2}SeO_{3})_{n}}$,defined as a Molecular Inorganic Polymer (MIP). The $\mathrm{K^{+}}$ cationsinfluence the orientation of the $\mathrm{SeO_{4}^{2-}}$ anions, and theseconsequently affect the arrangement of the $\mathrm{H_{2}SeO_{3}}$ moleculeswithin the structure. The crystal packing forces are governed by ionic anddipole-dipole interaction. Full-matrix least-square refinement method on $F^2$provide final Reliability indices of $R_{1}$ = 0.0150, and $wR_{2}$ = 0.0377,and a Goodness-of-fit = 1.140; at 0.75 {\AA} resolution, where $R_{int}$ =0.0230, and $F(000)$ = 656 for 1014 independent reflections ($I>2\sigma(I)$),from a total of 8,576 reflections collected.

Crystal Structure Elucidation of the Novel Molecular-Inorganic Polymer $\mathrm{K_{2}SeO_{4}\cdot H_{2}SeO_{3}}$