Table 1. Bond Lengths and Angles of Interest for Complex Cu1 and Models [Cu(dipp)₂]⁺ and [Cu(dtbp)₂]⁺ Obtained by X-ray Scattering.

parameter	[Cu(dipp)2]+(BF4–)19	[Cu(dtbp)2]+(BF4–)15	Cu1(PF6)
distances (Å)
Cu–N1A	2.083	2.104(2)	2.057(4)
Cu–N2A	2.017	2.111(2)	2.122(4)
Cu–N1B	2.067	2.108(2)	2.031(4)
Cu–N2B	2.030	2.105(2)	2.207(4)
angles (deg)
N1A–Cu–N2A	82.25	84.53	82.09(14)
N1A–Cu–N1B	107.35	123.26	120.32(15)
N1A–Cu–N2B	118.71	122.92	126.36(14)
N2A–Cu–N1B	128.97	121.37	126.10(15)
N2A–Cu–N2B	138.38	124.93	126.94(13)
N1B–Cu–N2B	81.52	84.82	81.06(16)
θx	82.2	88.6	87.2
θy	72.5	90.0	87.4
θz	85.4	91.8	87.3
τ4(18)	0.66	0.79	0.76