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Issue 2, 2013
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Zinc(ii) and cadmium(ii) carboxyphosphonates with a 3D pillared-layered structure: synthesis, crystal structures, high thermal stabilities and luminescent properties

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Abstract

Two novel divalent metal carboxyphosphonates with a 3D pillared-layered structure, [Zn(HL)] (1) and [CdCl(H2L)] (2) (H3L = 4-HOOCC6H4CH2NHCH2PO3H2), have been synthesized under hydrothermal conditions. Compounds 1 and 2 both feature three-dimensional (3D) framework structures with two-dimensional (2D) inorganic layers pillared by H3L. In compound 1, each {ZnO4} tetrahedron is linked via corner-sharing by three {CPO3} tetrahedra to form a two-dimensional (2D) inorganic layer in the ac-plane. The adjacent layers are further pillared by the organic backbone {–C6H4CH2NHCH2–} of the carboxyphosphonate ligand, generating a 3D pillared-layered structure. For compound 2, each Cd(II) cation is six-coordinated, and the interconnection of two {CdCl2O4} octahedra forms a dimer via edge-sharing. The dimers are interconnected by {CPO3} tetrahedra via corner-sharing to form a 2D inorganic layer in the ab-plane. Such neighboring 2D inorganic layers are further cross-linked through the organic pillars of the carboxyphosphonate ligand, thus resulting in a 3D pillared-layered structure. An interesting feature of compounds 1 and 2 is the presence of alternate left- and right-handed helical chains in their structures. It is of note that two title compounds are both stable up to high temperature. The luminescent properties of compounds 1 and 2 have also been studied.

Graphical abstract: Zinc(ii) and cadmium(ii) carboxyphosphonates with a 3D pillared-layered structure: synthesis, crystal structures, high thermal stabilities and luminescent properties

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Article information


Submitted
18 Oct 2012
Accepted
12 Nov 2012
First published
12 Nov 2012

RSC Adv., 2013,3, 623-631
Article type
Paper

Zinc(II) and cadmium(II) carboxyphosphonates with a 3D pillared-layered structure: synthesis, crystal structures, high thermal stabilities and luminescent properties

W. Chu, Y. Zhu, Z. Sun, C. Jiao, J. Li, S. Sun, H. Tian and M. Zheng, RSC Adv., 2013, 3, 623
DOI: 10.1039/C2RA22571A

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