The structural variations in the azophosphines and the azophosphine-boranes were also explored. Azophosphine 1-OMe and all six azophosphineboranes 2-R were characterised by single crystal Xray diffraction (SXRD) (Figure ). Note the structures of 1-NMe2 and 2-NMe2 were previously reported and are not reproduced in Figure , but the bond metric data are used here for comparison purposes. Selected bond distances, bond angles and torsion angles for crystallographically characterised azophosphines 1-NMe2, 1-OMe and azophosphineboranes 2-R are tabulated in Table .