Issue 7, 2011

Direct assembly of new cobalt(iii)-lanthanide(iii) heterometallic frameworks with NaCl-like topology

Abstract

Through hydrothermal treatment, a series of new 3D noninterpenetrating cobalt(III)-lanthanide(III) heterometallic coordination assemblies bearing 2,2′-bipyridine-4,4′-dicarboxylate (H2bpdc) ligands, CoLn2(bpdc)3(NO3)3(H2O)6·3.5H2O (Ln = Gd (2), Eu (3), Sm (4), La (5)), have been obtained which may be regarded as being derived from Co2(Hbpdc)2(bpdc)2(H2O)2·2H2O (1) with one-dimensional (1D) zigzag chains. The results of single-crystal X-ray analysis and the X-ray photoelectron spectroscopy study show that each Co center in all of the compounds is located in six-coordinate octahedral surroundings, and exhibits the trivalent oxidation state. Compounds 2–5 possess isostructural 3D NaCl-type frameworks containing Ln2O16 building blocks, exhibiting square pores with dimensions of ca. 8 × 8 Å2 along the [010] direction, which are occupied by nitrate anions and non-coordinated water molecules. The frameworks of 2–5 are stable up to ca. 300 °C followed by removal of the coordinated and uncoordinated water molecules, as is evident from the associated weight loss. The magnetic and gas adsorption properties for the Co(III)-Gd(III) system have been investigated.

Graphical abstract: Direct assembly of new cobalt(iii)-lanthanide(iii) heterometallic frameworks with NaCl-like topology

Supplementary files

Article information

Article type
Paper
Submitted
24 Nov 2010
Accepted
16 Dec 2010
First published
31 Jan 2011

CrystEngComm, 2011,13, 2391-2398

Direct assembly of new cobalt(III)-lanthanide(III) heterometallic frameworks with NaCl-like topology

H. Liu, Y. Yuan, Z. Yu and Z. Zou, CrystEngComm, 2011, 13, 2391 DOI: 10.1039/C0CE00881H

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