Four new deficient compounds in the R_6B_2C_2Q_(14)family,La_5CaSn_(2.75)S_(14)1,Y_6Al_(0.67)Ge_2S_(14_2,Er_(5.33)Si_4S_(14)3 and Er_4Ge_4S_(14)4,have been obtained via a precursor/flux method.Single-crystal analysis indicated that their crystal structures consist of three types of building blocks:RS_7(R=La/Ca for 1,R=Y for 2,R=Er for 3 and 4)mono-triangonal prism,CS_6(C=Al for 1,C=Sn(2)for 2,C=Si(2)for 3,C=Ge(2)for 4)octahedron,and BS_4(B=Si for 1,B=Sn(1)for 2,B=Si(1)for 3,B=Ge(1)for 4)tetrahedron,as any other compounds belong to the R_6B_2C_2Q_(14)family.
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) , V = 1679.1(5) 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 interactions and C≡N···π interactions to generate a 3-D structure. Compound 1 displays intense bluish-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.
