Figure 2
The helical arrangements, viewed along [001], in the structures of (a) lithium (Menezes et al., 2008b), (b) sodium (Shi, Shan, Dai et al., 2003), (c) potassium, (I), and (d) rubidium (Engelhardt, 2000) cobalt borophosphates. Atom labels refer to one of the symmetry-equivalent positions of the respective atoms. |