A. Pisareva, G. Shilov, A. I. Karelin
Feb 1, 2008
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Journal
Russian Chemical Bulletin
Abstract
The molecular and crystal structure of single-crystalline mesitylenesulfonic acid dihydrate (1) was determined by X-ray diffraction and IR spectroscopy. According to X-ray diffraction data, water molecules in the crystal structure form H5O2+ cations stabilized by an intracationic hydrogen bond with a length of 2.45(1) Å. The formation of the asymmetric H5O2+ cation was confirmed by IR spectroscopy. The crystallographic nonequivalence of the water molecules results in a shift of the bridging proton from the midpoint of the strong hydrogen bond in the cation toward one of the water molecules. The proton conductivity of compound 1 was measured by impedance spectroscopy. Dihydrate 1 is completely dehydrated upon prolonged storage in a dry argon glove box and undergoes the transition to the dielectric state. Compound 1 is stable in the humidity range of 32–66 rel.%. The conductivity of dihydrate 1 is (2.4±0.3) · 10−5 Ohm−1 cm−1 at 298 K, Ea = 0.21±0.01 eV.