An unusual Pb8 clusters based coordination polymer with room-temperature orange phosphorescence

A new 2D phosphorescence lead metal cluster-based coordination polymer (CP) [Pb-4(mu(2)-OH) (mu(3)-OH) (mu(4)-O) (3-qlc)(4)](n) (1; 3-qlc = 3-quinolinecarboxylate) has been successfully synthesized by solvothermal reaction. CP 1 is a robust Pb(II) CP constructed by a rare [Pb-8(mu(2)-OH)(2) (mu(3)-OH)(2) (mu(4)-O)(2)(COO)(8)] cluster units and 3-qlc ligands. The bulky clusters provide architectural stability to the framework of 1. Interestingly, CP 1 exhibited almost pure room-temperature orange phosphorescence with absolute phosphorescence quantum yields of 3.3% and a phosphorescence lifetime of 1.52 ms benefiting from the restriction of molecular vibrations/rotations of organic luminogens (3-qlc) and the heavy-atom effect of Pb(II).

Automated summary

A new two-dimensional phosphorescence lead metal cluster-based coordination polymer has been successfully synthesized, exhibiting almost pure room-temperature orange phosphorescence with high quantum yields and long lifetime. This was achieved by the restriction of molecular vibrations/rotations of the organic luminogens and the heavy-atom effect of Pb(II).