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A new 1,3,4-oxa­diazole-containing bis­pyridyl ligand, namely 5-(pyridin-4-yl)-3-[2-(pyridin-4-yl)eth­yl]-1,3,4-oxa­diazole-2(3H)-thione (L), has been used to create the novel complexes tetra­nitrato­bis{μ-5-(pyridin-4-yl)-3-[2-(pyridin-4-yl)ethyl]-1,3,4-oxa­diazole-2(3H)-thione}zinc(II), [Zn2(NO3)4(C14H12N4OS)2], (I), and catena-poly[[[dinitrato­copper(II)]-bis­{μ-5-(pyridin-4-yl)-3-[2-(pyridin-4-yl)ethyl]-1,3,4-oxa­diazole-2(3H)-thione}] nitrate aceto­nitrile sesqui­solvate di­chloro­methane sesqui­solvate], {[Cu(NO3)(C14H12N4OS)2]NO3·1.5CH3CN·1.5CH2Cl2}n, (II). Compound (I) presents a dis­torted rectangular centrosymmetric Zn2L2 ring (dimensions 9.56 × 7.06 Å), where each ZnII centre lies in a {ZnN2O4} coordination environment. These binuclear zinc metallocycles are linked into a two-dimensional network through nonclassical C—H...O hydrogen bonds. The resulting sheets lie parallel to the ac plane. Compound (II), which crystallizes as a nonmerohedral twin, is a coordination polymer with double chains of CuII centres linked by bridging L ligands, propagating parallel to the crystallographic a axis. The CuII centres adopt a distorted square-pyramidal CuN4O coordination environment with apical O atoms. The chains in (II) are inter­linked via two kinds of π–π stacking inter­actions along [0\overline 11]. In addition, the structure of (II) contains channels parallel to the crystallographic a direction. The guest components in these channels consist of di­chloro­methane and aceto­nitrile solvent mol­ecules and uncoordinated nitrate anions.
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