Abstract
The infrared spectrum of matrix isolated pyridine and pyridine‐d5 is studied in noble gas matrices. A number of vibration band splittings is observed, most of which have not yet been reported in literature. The splittings are found to be caused by two types of association, a pyridine‐pyridine one and a pyridine‐H2O complex. Information concerning the structure of the associated systems is obtained from a careful analysis of the experimental results.

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