Table 3. Binding Distances M–X (Å) of the [M(mcp)(H₂O)]^(m−2)+ Complexes (M = Ba²⁺, La³⁺, Eu³⁺, Lu³⁺, Pb²⁺, and Ra²⁺) in Aqueous Solutions^awith Atom Assignment in the Macropa Structure Shown in Figure 8.

	(M−)X
	Pb–X	Ba–X	Ra–X	La–X	Eu–X	Lu–X
O1 (mcp)	3.09	3.00	3.07	2.84	2.72	2.37
O2 (mcp)	3.29	3.01	3.12	2.92	2.75	2.89
O3 (mcp)	–	2.93	3.19	2.83	2.97	–
O4 (mcp)	3.08	3.25	2.95	2.98	–	–
N1 (mcp)	2.91	3.02	3.10	2.98	2.89	2.57
N2 (mcp)	–	3.19	3.22	2.98	2.97	–
O5 (mcp)	2.39	2.70	2.72	2.44	2.29	2.17
O6 (mcp)	2.35	2.70	2.78	2.45	2.32	2.19
N3 (mcp)	2.54	2.88	2.88	2.70	2.54	2.37
N4 (mcp)	2.71	2.85	2.94	2.70	2.57	2.66
O (H2O)	–	2.96	3.10	2.59	2.45	2.25
estimated total CN	8	11	11	11	10	8

^aAtom pairs with distances above 3.4 Å are considered to form no coordinative bond and are marked with “–”.