Organically pillared layered zinc hydroxides

The two organically pillared layered zinc hydroxides [Zn-2(OH)(2)(ndc)], CPO-6, and [Zn-3(OH)(4)(bpdc)], CPO-7, were obtained in hydrothermal reactions between 2,6-naphthalenedicarboxylic acid (ndc) and zinc nitrate (CPO-6) and 4,4'biphenyldicarboxylate (bpdc) and zinc nitrate (CPO-7), respectively. In CPO-6, the tetrahedral zinc atoms are connected by two mu(2)-OH groups and two carboxylate oxygen atoms, forming infinite layers extending parallel to the bc-plane. These layers are pillared by ndc to form a three-dimensional structure. In CPO-7, the zinc hydroxide layers are containing four-, live- and six coordinated zinc atoms, and the layers are built like stairways running along the [001] direction. Each step is composed of three infinite chains running in the [010] direction. Both crystal structures were solved from conventional single crystal data. Crystal data for CPO-6: Monoclinic space group P2(1)/c (No. 14), a = 11.9703(7), b = 7.8154(5), c 6.2428(4)Angstrom, beta = 90.816(2)degrees, V = 583.97() Angstrom(3) and Z = 4. Crystal data for CPO-7: Monoclinic space group C2/c (No. 15), a = 35.220(4)1 b = 6.2658(8), c = 14.8888(17) Angstrom, beta = 112.580(4)degrees, V = 3033.8(6) Angstrom(3) and Z = 8. The compounds were further characterized by thermogravimetric- and chemical analysis. (C) 2004 Published by Elsevier Inc.