Abstract
Under hydrothermal conditions, using 5-methyl-pyrazine-2-carboxylic acid (HL) and lead(II) bromide, a new 2D lead(II) framework [Pb(L)(μ2-Br)(H2O)]n (1) can be isolated, in which infinite Pb-O-Pb and Pb-Br-Pb helical chains can be observed. The crystal crystallizes in the monoclinic system, space group P2(1)/c, a = 7.5493(10), b = 6.6775(9), c = 19.335(3) Å, β = 92.884(2)°, and Z = 1. The X-ray analysis shows that strong O-H···N and weak O-H···Br hydrogen bonds further extending 1 into a 3D supramolecular packing architecture. Solid state luminescent spectrum of 1 also has been investigated indicating strong emission bands centered at 453 nm.
Acknowledgments
This present work was supported financially by the Open Project of Key Lab Adv Energy Mat Chem (Nankai University, KLAEMC-OP201201), Tianjin Educational Committee (20090504), and National Natural Science Foundation of China (51102180 and 21001080).