Table 2. Continuous shape measurement (CShM) values (SHAPE 2.1; Llunell et al., 2013 ▸) for the four-coordinate copper(II) ions.

	Square	Tetra­hedron	Seesaw	Vacant trigonal bipyramid
Cu1	0.025	33.350	19.048	34.881
Cu2	1.870	22.459	11.479	23.026
Cu3	0.404	30.267	16.579	30.405
Cu4	0.027	33.352	19.058	34.887
Cu5	0.435	30.734	16.919	30.682
Cu6	0.606	28.098	15.366	28.580