Organically templated zinc selenites: MIL-86 or [H2N(CH2)(2)NH2](2)center dot Zn-4(SeO3)(4) and MIL-87 or [H3N(CH2)(3)NH3](4)center dot Zn-4(SeO3)(8)

摘要

Two new organically templated zinc selenites MIL-86 or [H2N(CH2)(2)NH2](2)Zn-.(4)(SeO3)(4) and MIL-87 or [H3N(CH2)(3)NH3](4)Zn-.(4)(SeO3)(8) have been prepared by the reaction of ZnO with SeO2 under hydrothermal conditions in the presence of organic amines. Crystal data: MIL-86, monoclinic, space group P2(1), a = 6.7712(4) Angstrom, b = 9.4520(5) Angstrom, c = 8.0295(4) Angstrom, beta = 113.601(1)degrees, V = 470.91(4) Angstrom(3); MIL-87, orthorhombic, space group Pbcm, a = 8.8311(3) Angstrom, b = 7.8391(2) Angstrom, c = 16.2992(4) Angstrom, V = 1128.36(6) Angstrom(3). MIL-86 combines the structural features of templated networks and coordination polymers. Its structure is built up from ZnO3N tetrahedra and SeO3 pseudopyramids 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 ZnO4 and SeO3 building units crosslinked by 1,3-diammonium propane cations. These structures are understood by comparison with the already known organically templated zinc phosphites. (C) 2004 Elsevier SAS. All rights reserved.