... Volume: Page: ... positive charge densities borne by the metals result in the successive cooperative complexation of two ligands to give [M(L7) n ... see Figure 2 and Figures S2–S5 in the Supporting Information) are compatible with an average planar C s symmetry ...
[Otsuki, Joe; Kurihara, Izumi; Imai, Arata; Hamada, Yuki; Omokawa, Nobuyuki Bulletin of the Chemical Society of Japan, 2007 , vol. 80, # 5 p. 902 - 909]