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The crystal structure of norbornadiene palladium chloride has been refined with data obtained by counter methods from crystals maintained at liquid nitrogen temperature. After refinement the conventional discrepancy index R=0.0275. The carbon-carbon single bond distances in the norbornadiene molecule are normal: 1.547, 1.552, 1.554 (=0.006) A; the double bond distances are barely significantly longer than normal: 1.366, 1.366 (=0.010) A. The observed double bond distance is now compatible with the infrared spectrum of the complexed olefin. (Author)
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Baenziger et al. (1965) studied this question.
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