Copper(I) thiocyanate networks with aromatic diimine ligands

A total of five new CuSCN-LL complexes with aromatic diimine ligands, LL = quinoxaline (Qox), quinazoline (Qnz), phthalazine (Ptz), 2-aminopyrazine (2-NH2Pyz), and 2-methoxypyrazine (2-MeOPyz) have been prepared and characterized by crystallographic methods. The following compounds are reported: (CuSCN)2(Qox) (1), (CuSCN)(Qnz) (2), (CuSCN)2(Ptz) (3), (CuSCN)2(2-NH2Pyz) (4), and (CuSCN)(2-MeOPyz) (5). Compounds 1–4 were prepared using an extended aqueous reflux method in the presence of KSCN and ammonia. Compound 5 was prepared by directly reacting solid CuSCN with the liquid ligand. In complexes 2 and 5, LL is monodentate, while in others LL is bridging bidentate. All network structures are 2-D sheets, consisting of μ2-LL-crosslinked CuSCN ladders for 1 and 4, LL-decorated CuSCN sheets for 2 and 5, and unusual μ2-LL-“stapled” sheets for 3.

Graphical abstractCopper(I) thiocyanate forms complexes (CuSCN)2(Qox), (CuSCN)(Qnz), (CuSCN)2(Ptz), (CuSCN)2(2-NH2Pyz), and (CuSCN)(2-MeOPyz) (Qox = quinoxaline, Qnz = quinazoline, Ptz = phthalazine, 2-NH2Pyz = 2-aminopyrazine, and 2-MeOPyz = 2-methoxypyrazine). In the Qnz and 2-MeOPyz complexes the ligand is monodentate, while in others the ligand is bridging bidentate. Ptz forms staple-like bridges.Figure optionsDownload full-size imageDownload as PowerPoint slide