Fig. 4

Schematic diagram showing the electronic density contours for the HOMO, and LUMO molecular orbitals of the (NEt4)2[Eu2(L1S)4] and (NEt4)2[Eu2(L2S)4].

Schematic diagram showing the electronic density contours for the HOMO, and LUMO molecular orbitals of the (NEt4)2[Eu2(L1S)4] and (NEt4)2[Eu2(L2S)4].