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Structural Diversity in Multinuclear PdII Assemblies that Show Low- Humidity Proton Conduction

Samanta, Dipak and Mukherjee, Partha Sarathi (2014) Structural Diversity in Multinuclear PdII Assemblies that Show Low- Humidity Proton Conduction. In: CHEMISTRY-A EUROPEAN JOURNAL, 20 (19). pp. 5649-5656.

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Official URL: http://dx.doi.org/10.1002/chem.201305075


Systematic investigation on synergetic effects of geometry, length, denticity, and asymmetry of donors was performed through the formation of a series of uncommon Pd-II aggregates by employing the donor in a multicomponent self-assembly of a cis-blocked 90 degrees Pd-II acceptor and a tetratopic donor. Some of these assemblies represent the first examples of these types of structures, and their formation is not anticipated by only taking the geometry of the donor and the acceptor building units into account. Analysis of the crystal packing of the X-ray structure revealed several H bonds between the counteranions (NO3-) and water molecules (OHON). Moreover, H-bonded 3D-networks of water are present in the molecular pockets, which show water-adsorption properties with some variation in water affinity. Interestingly, these complexes exhibit proton conductivity (1.87x10(-5)-6.52x10(-4)Scm(-1)) at 296K and low relative humidity (ca. 46%) with activation energies of 0.29-0.46eV. Moreover, the conductivities further increase with the enhancement of humidity. The ability of these assemblies to exhibit proton-conducting properties under low-humidity conditions makes these materials highly appealing as electrolytes in batteries and in fuel-cell applications.

Item Type: Journal Article
Additional Information: copyright for this article belongs to WILEY-V C H VERLAG GMBH, BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
Keywords: cage compounds; palladium; proton conduction; self-assembly
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 09 Jun 2014 07:52
Last Modified: 09 Jun 2014 07:52
URI: http://eprints.iisc.ac.in/id/eprint/49217

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