Enhanced proton conductivity in a layered coordination polymer

authors	Mendes, RF; Barbosa, P; Domingues, EM; Silva, P; Figueiredo, F; Paz, FAA
nationality	International
journal	CHEMICAL SCIENCE
keywords	METAL-ORGANIC FRAMEWORKS; LUMINESCENT; CONDUCTORS; DESIGN; MOF
abstract	[Gd(H(4)nmp)(H2O)(2)]Cl center dot 2H(2)O (1) converts into [Gd-2(H(3)nmp)(2)]center dot xH(2)O (2) (x= 1 to 4) with a notable increase in proton conductivity.1is a charged layered material counter balanced by chloride ions, with proton conductivity values of 1.23 x 10(-5)S cm(-1)at 98% relative humidity (RH) and 40 degrees C. At 98% RH and 94 degrees C the observed conductivity is 0.51 S cm(-1), being to date one of the highest values ever reported for a proton-conducting coordination polymer. This increase is observed during a structural transformation into2that occurs at high temperature and RH. While this remarkable conductivity is observed only after transformation and by maintaining high humidity conditions, as-synthesized2also shows a conductivity value of 3.79 x 10(-2)S cm(-1)at 94 degrees C and 98% RH, still ranked as one of the highest reported values. Moreover, it is shown that the key factor for high proton conduction is the unusual dynamic structural transformation with water insertion and release of chloride ions.
publisher	ROYAL SOC CHEMISTRY
issn	2041-6520
isbn	2041-6539
year published	2020
volume	11
issue	24
beginning page	6305
ending page	6311
digital object identifier (doi)	10.1039/d0sc01762k
web of science category	Chemistry, Multidisciplinary
subject category	Chemistry
unique article identifier	WOS:000542898000019