Figure 2
Two alternative presentations of the inorganic monolayer: (a) as a two-dimensional arrangement of corner-sharing K2O12, CaO6 and CSO3 polyhedra, and (b) as a two-dimensional coordination framework formed from K ribbons, which are interweaved at the Ca ions. R1 and R2 are the centrosymmetric ring motifs R2,2(4) and R2,4(8) interlinking the potassium ions inside the ribbon; R3 is the noncentrosymmetric R2,4(8) motif interlinking the calcium and potassium metal centers; and R4 is the nano-sized R4,8(16) window generated in the framework. The R4 windows are stacked one over the other in order to form nano-sized channels along the c axis. For the sake of clarity, the arene rings and the terminal carboxyl groups (except for the coordinating O11B atom) have been omitted. [Symmetry codes: (ii) −x, −y + 2, −z + 1; (iv) −x + 1, −y + 2, −z + 1.] |