AbstractMolecular Complexes and Coordination Polymers of Divalent Mercury with the 4‐N‐Ligand 6,7‐Dimethyl‐2,3‐di‐(2′‐pyridyl)‐chinoxaline (Dpc)Single crystals of six 6,7‐dimethyl‐2,3‐di‐(2′‐pyridyl)‐chinoxaline (Dpc) complexes of divalent mercury with –CF3, ‐SCN, ‐NO3, ‐I, ‐Br, and ‐Cl as the ligands have been obtained mostly by slow evaporation of solutions of the mercuric salts Hg(CF3)2, Hg(SCN)2, Hg(NO3)2, HgI2, HgBr2, or HgCl2 and Dpc. The crystal structures were determined by single crystal X‐ray diffraction: [Hg(CF3)2(Dpc)] (1) [monoclinic, P21/c (no. 14), a = 815.7(1), b = 2780.2(4), c = 1036.5(1) pm, β = 99.78(1)°, V = 2316.5(4) 106 pm3, Z = 4, R1 [I0 > 2σ(I0)] = 0.0334], [Hg(SCN)2(Dpc)] (2) [triclinic, $\rm P{\bar 1}$ (no. 2), a = 817.4(2), b = 1075.8(2), c = 1427.0(3) pm, α = 110.48(2), β = 103.02(3), γ = 94.42(3)°, V = 1128.5(4) 106 pm3, Z = 2, R1 [I0 > 2σ(I0)] = 0.0425], [(HgCl2)2(Dpc)](CH3CN) (3) [triclinic, $\rm P{\bar 1}$ (no. 2), a = 942.8(1), b = 950.6(1), c = 1486.9(2) pm, α = 80.18(1), β = 79.57(1), γ = 87.73(1)°, V = 1291.3(3) 106 pm3, Z = 2, R1 [I0 > 2σ(I0)] = 0.0469], [HgBr2(Dpc)] (4) [monoclinic, C2/c (no. 15), a = 792.9(1), b = 2411.5(5), c = 1261.5(2) pm, β = 102.11(2)°, V = 2358.5(6) 106 pm3, Z = 4, R1 [I0 > 2σ(I0)] = 0.0354], [HgI2(Dpc)] (5), [monoclinic, C2/c (no. 15), a = 4162.2(17), b = 747.8(2), c = 1509.4(5) pm, β = 111.16(3)°, V = 4369.0(20) 106 pm3, Z = 8, R1 [I0>2σ(I0)] = 0.0547], [Hg(NO3)2(Dpc)](H2O) (6) [monoclinic, P21/c (no. 14), a = 1256.1(2), b = 1257.8(2), c = 1482.1(3) pm, β = 116.44(1)°, V = 2096.6(6) 106 pm3, Z = 4, R1 [I0 > 2σ(I0)] = 0.0414]. The crystal structures of 2, 3 and 5 consist of molecular complexes, those of 1, 4 und 6 exhibit coordination polymers. In all cases, HgII has a characteristic coordination number of, essentially, CN = 2, to different ligator atoms, C in 1, S in 2, Cl, Br, and I in 3‐5 as well as N in 6.