RT Journal Article
T1 Water-free proton conduction in discotic pyridylpyrazolate-based Pt(II) and Pd(II) metallomesogens
A1 Cuerva de Alaiz, Cristian
A1 Campo Santillana, José Antonio
A1 Cano Esquivel, María Mercedes
A1 Sanz, Jesús
A1 Sobrados, Isabel
A1 Diez-Gómez, Virginia
A1 Rivera Calzada, Alberto Carlos
A1 Schmidt, Rainer
AB In this work we report on water-free proton conductivity in liquid-crystal pyridylpyrazolate-based Pt(II) and Pd(II) complexes [M(pzR(n,n)py)2] (pzR(n,n)py = 3-(3,5-dialkyloxyphenyl)-5-(pyridin-2-yl)pyrazolate, R(n,n) = C6H3(OCnH2n+1)2; n = 4, 12, 16, M = Pd; n = 12, M = Pt) with potential application as electrolyte materials in proton exchange membrane fuel cells. The columnar ordering of the complexes in the liquid-crystalline phase opens nanochannels, which are used for fast proton exchange as detected by impedance spectroscopy and NMR. The NMR spectra indicate that the proton conduction mechanism is associated with a novel C–H···N proton transfer, which persists above the clearing point of the material. The highest conductivity of ∼0.5 μS cm–1 at 180 °C with an activation energy of 1.2 eV is found for the Pt(II) compound in the mesophase. The Pd(II) complexes with different chain length (n = 4, 12, and 16) show lower conductivity but smaller activation energies, in the range of 0.74–0.93 eV.
PB American Chemical Society
SN 0020-1669
YR 2016
FD 2016
LK https://hdl.handle.net/20.500.14352/93599
UL https://hdl.handle.net/20.500.14352/93599
LA eng
NO Cuerva C, Campo JA, Cano M, Sanz J, Sobrados I, Diez-Gómez V, Rivera-Calzada A, Schmidt R. Water-free proton conduction in discotic pyridylpyrazolate-based Pt(II) and Pd(II) metallomesogens. Inorg. Chem. 2016, 55(14), 6995-7002
NO Ministerio de Economía y Competitividad, (España)
NO Universidad Complutense de Madrid 
DS Docta Complutense
RD 8 abr 2025