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Chemical design of materials: A case study of inorganic open-framework materials

Rao, CNR and Dan, Meenakshi and Behera, JN (2005) Chemical design of materials: A case study of inorganic open-framework materials. In: Pure and Applied Chemistry, 77 (10). pp. 1655-1674.

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Inorganic open-framework materials are discussed as a case study in the chemical design of materials. Investigations of open-framework zinc phosphates have demonstrated that the formation of the complex 3D architectures may involve a process where in ID ladders or chains, and possibly OD monomers comprising four-membered rings, transform to the higher-dimensional structures. The I D ladder and the four-membered rings appear to be important building units of these structures. At one stage of the building-up process, spontaneous self-assembly of a low-dimensional structure such as the ladder could occur, followed by the crystallization of a 3D structure. Accordingly, many of the higher-dimensional structures retain structural features of the OD or ID structure. It is significant that a four-membered ring zinc phosphate spontaneously yields a linear chain phosphate at room temperature, on addition of piperazine, the chain transforming to a sodalite-type 3D structure under mild conditions. The occurrence of a hierarchy of structures from 0-3 dimensions is found in open-framework metal oxalates as well. Interestingly, the 3D sodalite structure is generated readily by the assembly of metal squarates, possessing the four-mernbered ring motif. It is note worthy that open-framework structures are also formed by oxyanions such as sulfate, selenite, and selenate. Transformations of molecules to complex architectures are a worthy area of study, defining a new direction in the chemistry of materials.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to International Union of Pure and Applied Chemistry.
Keywords: Open-framework phosphates;metal phosphates;open-framework carboxylates;metal carboxylates;metal squarates;open-framework sulfates;open-framework selenates
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: B.S Priyanka
Date Deposited: 12 Dec 2005
Last Modified: 27 Aug 2008 11:37
URI: http://eprints.iisc.ac.in/id/eprint/4420

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