Two proton-conductive hybrids based on 2,2 Prime -biimidazole molecules and Keggin-type heteropolyacids

Journal Article · Fri Feb 15 04:00:00 EST 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.10.025· OSTI ID:22150035

Wei, Mei-Lin ^[1]; Wang, Jun-Hua; Wang, Yu-Xia ^[1]

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1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007 (China)

Two proton-conductive organic/inorganic complexes were constructed by Keggin-type heteropolyacids and 2,2 Prime -biimidazole molecules. Single-crystal X-ray diffraction analyses revealed that two complexes crystallized in the triclinic space group Pi, exhibited very close unit cell parameters, and presented similar three-dimensional (3D) hydrogen-bonded networks constructed by H{sub 2}biim, [PM{sub 12}O{sub 40}]{sup 3-} (M=W for 1 and Mo for 2) and solvent molecules. The results of thermogravimetric analyses (TG) suggest that two supramolecular complexes have similar thermal stability based on the same 3D packing. Two complexes at 100 Degree-Sign C under 98% relative humidity showed a good proton conductivity of about 10{sup -4} S cm{sup -1}. A possible mechanism of the proton conduction was proposed according to the experimental results. - Graphical Abstract: Two molecular hybrids constructed by Keggin-type heteropolyacids and 2,2 Prime -biimidazole molecules showed good proton conductivities of 10{sup -4} S cm{sup -1} in the temperature range of 85-100 Degree-Sign C under 98% relative humidity. Highlights: Black-Right-Pointing-Pointer H{sub 2}biim shows the ability to form hydrogen bonds via the N-H groups in the context of crystal engineering. Black-Right-Pointing-Pointer Heteropolyacids have suitable characteristics to be used excellent proton conductors. Black-Right-Pointing-Pointer Two new supramolecular complexes based-on Keggin-type heteropolyacids and H{sub 2}biim molecules were constructed. Black-Right-Pointing-Pointer The structure was determined by using single-crystal X-ray diffraction data. Black-Right-Pointing-Pointer Both complexes showed good proton conductivities of 10{sup -4} S cm{sup -1} in the temperature range of 85-100 Degree-Sign C.

• OSTI ID: 22150035
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 198; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPLEXES
HUMIDITY
HYBRIDIZATION
HYDROGEN
MONOCRYSTALS
PROTON CONDUCTIVITY
PROTONS
SOLVENTS
SPACE GROUPS
TEMPERATURE RANGE
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION