New open-framework zinc oxalates synthesized in the presence of structure-directing organic amines

Vaidhyanathan, R. ; Natarajan, Srinivasan ; Cheetham, Anthony K. ; Rao, C. N. R. (1999) New open-framework zinc oxalates synthesized in the presence of structure-directing organic amines Chemistry of Materials, 11 (12). pp. 3636-3642. ISSN 0897-4756

Full text not available from this repository.

Official URL: http://pubs.acs.org/doi/abs/10.1021/cm990434x

Related URL: http://dx.doi.org/10.1021/cm990434x

Abstract

Two new open-framework zinc oxalates have been prepared by hydrothermal methods in the presence of structure-directing organic amines. The crystal data for these oxalates are as follows: I, [H3N(CH2)3NH3]2+[Zn2(C2O4)3]2-·3H2O, triclinic, space group P ↑ (no. 2), a = 9.261(1) Å, b = 9.455(1) Å, c = 12.487(1), α = 83.93(1)°, β = 88.01(1)°, γ = 61.03(1)°, V = 951.1(1) Å3, Z = 2, M = 524.8, Dcalc = 1.83 g cm-3, μ = 2.60 mm-1, Mo Kα, RF = 0.03; II, 2[C3H7NH3]+[Zn2 (C2O4)3]2-·3H2O, monoclinic, space group C2/c (no. 15), a = 15.847(1) Å, b = 9.685(1) Å, c = 18.333(1), β = 115.5(1)°, V = 2539.1(2) Å3, Z = 4, M = 569.1, Dcalc = 1.60 g cm-3, μ = 1.97 mm-1, Mo Kα, RF = 0.07. In I, the linkages between the Zn and oxalate units gives rise to a layered architecture with 12-membered (6 Zn and 6 oxalates) honeycomb-like apertures wherein the amine and water molecules are located. In II, the Zn-oxalate layers are cross-linked by another oxalate unit giving rise to a three-dimensional structure with two distinct channels where the amine and water molecules reside; the largest aperture in II involves a 20-membered ring (10 Zn and 10 oxalates). There is extensive hydrogen bonding among the amine, water, and the framework. Adsorption studies indicate that water can be reversibly adsorbed in I.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:27801
Deposited On:11 Dec 2010 07:53
Last Modified:10 Jun 2011 09:44

Repository Staff Only: item control page