Synthesis, Crystal Structure, Hydrogen Bonding and Thermal Behaviour of a Three-Dimensional Cu(II)-Benzene-1,2,4,5-Tetracarboxylate Templated by 1,9-Diaminononane

9 Pages Posted: 25 Jul 2018

See all articles by Roberto Köferstein

Roberto Köferstein

Martin Luther Universitat Halle Wittenberg

Christian Robl

Friedrich-Schiller-Universität Jena - Institute of Inorganic and Analytical Chemistry

Date Written: May 5, 2014

Abstract

Triclinic single crystals of Cu4(H3N–(CH2)9–NH3)(OH)2[C6H2(COO)4]2·5H2O were prepared in aqueous solution at 80 °C in the presence of 1,9-diaminononane. Space group P (no. 2) with a = 1057.5(2), b = 1166.0(2), c = 1576.7(2) pm, alpha = 106.080(10)°, beta = 90.73(2)° and gamma =94.050(10)°. The four crystallographic independent Cu2 ions are surrounded by five oxygen atoms each with Cu–O distances between 191.4(3) and 231.7(4) pm. The connection between the Cu2 coordination polyhedra and the [C6H2(COO)4]4– anions yields three-dimensional framework with negative excess charge and wide centrosymmetric channel-like voids. These voids extend parallel to [001] with the diagonal of the nearly rectangular cross-section of approximately 900 pm. The channels of the framework accommodate [H3N–(CH2)9–NH3]2 cations and water molecules, which are not connected to Cu2 . The nonane-1,9-diammonium cations adopt a partial gauche conformation. Thermoanalytical measurements in air show a loss of water of crystallization starting at 90 °C and finishing at approx. 170 °C. The dehydrated compound is stable up to 260 °C followed by an exothermic decomposition yielding copper oxide.

Suggested Citation

Köferstein, Roberto and Robl, Christian, Synthesis, Crystal Structure, Hydrogen Bonding and Thermal Behaviour of a Three-Dimensional Cu(II)-Benzene-1,2,4,5-Tetracarboxylate Templated by 1,9-Diaminononane (May 5, 2014). Available at SSRN: https://ssrn.com/abstract=3206810 or http://dx.doi.org/10.2139/ssrn.3206810

Roberto Köferstein (Contact Author)

Martin Luther Universitat Halle Wittenberg ( email )

Universitätsplatz 10
Halle (Saale), Saxony-Anhalt 06108
Germany

Christian Robl

Friedrich-Schiller-Universität Jena - Institute of Inorganic and Analytical Chemistry ( email )

Germany

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