Crystal Structure and Photoluminescence of a New Cadmium Complex with 6,7-Dicyanodipyridoquinoxalin

The reaction of CdCl2 with 6,7-dicyanodipyridoquinoxaline (DICNQ) by solvothermal reaction gives rise to a coordination polymer [CdCl2(DICNQ)]n 1. Single-crystal X-ray diffraction analysis reveals that the compound in space group Pbcn creates 1-D chloro-bridging chains. Crystal data for 1: a = 6.756(1), b = 35.371(6), c = 7.027(1) (A), V= 1679.1(5) (A)3, Z = 4.00,C16H6CdCl2N6, Mr = 465.57, Dc = 1.842 g/cm3, μ = 1.630 mm-1, F(000) = 904, S = 1.005 and T =293(2) K. The final R = 0.0376 and wR = 0.1029 for 1291 observed reflections with I> 2σ(I), and R = 0.0499 and wR = 0.1125 for all data. The 1-D chloro-bridging chains are parallel-stacked in the a and b directions, and further stabilized through π-stacking interactions, hydrogen-bonding inbluish-green photoluminescence from the intraligand charge-transfer of the DICNQ ligand and the Cl-to-DICNQ charge-transfer mechanism which is probed by the density of states (DOS) calculations. ab