Structural studies of pyridine-intercalated tantalum disulphide

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Abstract
X-ray and electron diffraction measurements show that the intercalation of TaS2 single crystals with pyridine is accompanied by a stacking change AcA BcB—AcA|AbA. The pyridine molecules in the interlamellar space form a superlattice with a rectangular 2a√3×13a coincidence cell. The proposal that the pyridine molecular planes lie parallel to the TaS2 layers has been discounted; the alternative perpendicular orientation is consistent with the data. The significance of these findings is discussed.