Description:
<jats:title>Abstract</jats:title><jats:p>The X‐ray structures of 4‐amidiniumpyridine acetate, (<jats:bold>1·</jats:bold>H)AcO, and of <jats:italic>cis</jats:italic>‐[Pt(<jats:bold>1</jats:bold>)<jats:sub>2</jats:sub>(PPh<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub>](NO<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub> (<jats:bold>2</jats:bold>), as well as their IR spectra, reveal intramolecular hydrogen bonding, which held together the cations and the anions. The IR spectroscopic data suggest that this may be so also in <jats:italic>cis</jats:italic>‐[PtCl(<jats:bold>1</jats:bold>)(PPh<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub>](BF<jats:sub>4</jats:sub>) (<jats:bold>3</jats:bold>). In (<jats:bold>1·</jats:bold>H)AcO and in <jats:bold>2</jats:bold> extensive intermolecular hydrogen bonding networks span through the whole crystals.</jats:p>