Organically templated zinc selenites: MIL-86 or [H 2N(CH 2) 2NH 2] 2·Zn 4(SeO 3) 4 and MIL-87 or [H 3N(CH 2) 3NH 3] 4·Zn 4(SeO 3) 8

Abstract

Two new organically templated zinc selenites MIL-86 or [H 2N(CH 2) 2NH 2] 2·Zn 4(SeO 3) 4 and MIL-87 or [H 3N(CH 2) 3NH 3] 4·Zn 4(SeO 3) 8 have been prepared by the reaction of ZnO with SeO 2 under hydrothermal conditions in the presence of organic amines. Crystal data: MIL-86, monoclinic, space group P2 1/ n, a=6.7712(4) Å, b=9.4520(5) Å, c=8.0295(4) Å, β=113.601(1)°, V=470.91(4) Å 3; MIL-87, orthorhombic, space group Pbcm, a=8.8311(3) Å, b=7.8391(2) Å, c=16.2992(4) Å, V=1128.36(6) Å 3. MIL-86 combines the structural features of templated networks and coordination polymers. Its structure is built up from ZnO 3N tetrahedra and SeO 3 pseudo-pyramids as the polyhedral building units. The ZnN bond corresponds to a direct link between zinc and the ethylenediamine template. In the other hand, MIL-87 is built up from chains of vertex-linked ZnO 4 and SeO 3 building units crosslinked by 1,3-diammonium propane cations. These structures are understood by comparison with the already known organically templated zinc phosphites.