Calculation of the electron density ρ_cp and the Laplacian ∇²ρ_cp (a.u) of cps (M–O, M–N) found by QTAIM.

Entry	Cp	Bonding region	ρ cp	∇2ρcp
Cu(ii)-complex	63	Cu33–N10	0.07	0.29
	59	Cu33–O10	0.08	0.45
	62	Cu33–O17	0.06	0.33
	68	Cu33–O19	0.07	0.43
Zn(ii)-complex	63	Zn33–N10	0.05	0.23
	59	Zn33–O10	0.05	0.31
	62	Zn33–O17	0.05	0.30
	68	Zn33–O19	0.06	0.40
Cd(ii)-complex	63	Cd33–N10	0.04	0.21
	61	Cd33–O10	0.02	0.15
	62	Cd33–O17	0.04	0.27
	69	Cd33–O19	0.06	0.35
Pb(ii)-complex	41	Pb33–N10	0.03	0.10
	46	Pb33–O10	0.04	0.16
	38	Pb33–O17	0.04	0.17
	36	Pb33–O19	0.05	0.22