Shree Ramakrishna B. T. College, Bugmari House, Darjeeling-734 101, West Bengal, India School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China Department of Chemistry, Jadavpur University, Kolkata-700 032, India E-mail : jpnaskar@rediffmail.com Fax : 91-33-24146223 Manuscript received 4 March 2008, revised 9 fume 2008, accepted 10 June 2008 Reaction of 2,2' -dipyridylamine (DPA) with hexafluorophosphoric acid (HPF6) in methanol generates white rod-shaped crystals

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... of HDPA.PF6,H2O. The salt is characterised by C, H and N analyses, FT-IR, 1H NMR, mass spectroscopy and molar conductance measurement. The X-ray crystal structure of the salt has been determined. The structure shows that the salt is monomeric. The amine nitrogen is strongly hydrogen bonded with oxygen atom of water. Two pyridyl rings are almost planar which is a rarity in the coordination chemistry of DPA. Semi-empirical AMI calculation was also performed to delve into the novel situation.