Structural investigations of phosphorus–nitrogen compounds. 7. Relationships between physical properties, electron densities, reaction mechanisms and hydrogen-bonding motifs of N<sub>3</sub>P<sub>3</sub>Cl<sub>(6 − <i>n</i>)</sub>(NHBu<sup> <i>t</i> </sup>)<sub> <i>n</i> </sub> derivatives
Acta crystallographica. Section B, Structural science