Table 2. Natural charges and Wiberg Bond Indices of cations [8]⁺–[10]⁺ determined by NBO analysis.

	[8]+ (M = Au)	[9]+ (M = Ag)	[10]+ (M = Cu)
Natural charge
M	0.50	0.67	0.69
Mn	–0.56	–0.60	–0.71
B	0.66	0.74	0.73
Wiberg bond indices (WBI)
M–Mn	0.14	0.10	0.10
M–B	0.42	0.25	0.25
Mn–B	0.77	0.88	0.85