Synthesis of a 2D polymeric cluster {[NEt4][Mo2O2S6Cu6I3(4,4′-bipy)5]·MeOH·H2O}n with a significant improvement of optical limiting effect

The self-assembly reaction of the monomeric nest-shaped cluster [NEt4]2[MoOS3Cu3I3] 1 or twin nest-shaped cluster [NEt4]4[Mo2O2S6Cu 6I6] 2 with the bridging ligand 4,4′-bipyridine (4,4′-bipy) gave a 2D polymeric cluster {[NEt4]- [Mo2O2S6Cu6I3(4,4 ′-bipy)5]·MeOH·H2O} n 3, which exhibits a significant improvement of optical limiting effect in its nonlinear optical properties relative to 1 or 2.