Selected structural and spectroscopic features of carbodiimide insertion products 5-Cu, 5-Ag and 5-Au.

M	d(M–C) (Å)	d(M–P) (Å)	∠(C–M–P) (°)	δ C (ppm)	δ P (ppm)
Cu	1.952(4)	2.2163(13)	179.04(13)	215.5	59.6
Ag	2.118(2)	2.3851(6)	176.76(8)	220.2	73.4
Au	2.158(10)	2.316(3)	175.7(3)	219.9	90.6