The first open-framework cadmium phosphate, K4[Cd3(HPO4)4(H2PO4)2], with a layered structure

Jayaraman, K. ; Vaidhyanathan, R. ; Natarajan, Srinivasan ; Rao, C. N. R. (2001) The first open-framework cadmium phosphate, K4[Cd3(HPO4)4(H2PO4)2], with a layered structure Journal of Solid State Chemistry, 162 (2). pp. 188-194. ISSN 0022-4596

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00224...

Related URL: http://dx.doi.org/10.1006/jssc.2001.9228

Abstract

A layered cadmium phosphate of the formula K4[Cd3(HPO4)4(H2PO4)2], I, containing six-membered apertures, constituting the first example of an open-framework cadmium phosphate, has been synthesized under hydrothermal conditions. Crystal data: monoclinic, P21/n (No. 14), a=9.0698(3), b=6.7341(3), and c=18.2663(7) Å, β=93.092(1)°, V=1114.03 Å3, Z=4. The structure consists of a network of CdO6 octahedra and PO3(OH) and PO2(OH)2 tetrahedra forming a spiro unit, which are connected through Cd2O2 two-membered rings forming one-dimensional chains. The chains are further connected forming two-dimensional macroanionic layers with six-membered apertures possessing hanging phosphate units on either side of the layer. The layers are stabilized by strong hydrogen bond interactions between the terminal P-OH groups forming pseudo channels in which the charge-compensating extraframework K+ ions are located. The presence of the spiro unit and the infinite one-dimensional Cd-O-Cd chains, along with the hanging phosphates are noteworthy structural features.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Spiro Units; One-dimensional Chains; Framework; Cadmium Phosphate
ID Code:42214
Deposited On:02 Jun 2011 06:50
Last Modified:22 Jul 2012 14:51

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