catena-Poly[[[4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole-κ(2)N(1),N(5)](dicyanamido-κN)copper(II)]-μ2-dicyanamido-κ(2)N:N']: coordination polymer chains linked into a bilayer by hydrogen bonds and π-π stacking interactions

Zouaoui Setifi; Fatima Setifi; Mohamed Saadi; Djamil Azzeddine Rouag; Christopher Glidewell

doi:10.1107/S205322961400504X

catena-Poly[[[4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole-κ(2)N(1),N(5)](dicyanamido-κN)copper(II)]-μ2-dicyanamido-κ(2)N:N']: coordination polymer chains linked into a bilayer by hydrogen bonds and π-π stacking interactions

Acta Crystallogr C Struct Chem. 2014 Apr;70(Pt 4):359-63. doi: 10.1107/S205322961400504X. Epub 2014 Mar 16.

Authors

Zouaoui Setifi¹, Fatima Setifi², Mohamed Saadi³, Djamil Azzeddine Rouag⁴, Christopher Glidewell⁵

Affiliations

¹ Département de Technologie, Faculté de Technologie, Université 20 Août 1955-Skikda, BP 26, Route d'El-Hadaiek, Skikda 21000, Algeria.
² Laboratoire de Chimie, Ingénierie Moléculaire et Nanostructures (LCIMN), Université Ferhat Abbas Sétif 1, Sétif 19000, Algeria.
³ Laboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V-Agdal, Avenue Ibn Battouta, BP 1014, Rabat, Morocco.
⁴ Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale (CHEMS), Université Constantine 1, Constantine 25000, Algeria.
⁵ School of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland.

PMID: 24705048
DOI: 10.1107/S205322961400504X

Abstract

In the title compound, [Cu(C2N3)2(C12H10N6)]n or [Cu(dca)2(abpt)]n, where abpt is 4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole and dca is the dicyanamide anion, the Cu(II) centre is five-coordinate with an approximately square-pyramidal geometry. One of the two dicyanamide ligands is a terminal ligand, but the other one acts as a μ1,5-bridging ligand between pairs of Cu(II) centres, so generating a one-dimensional coordination polymer. A combination of N-H···N and C-H···N hydrogen bonds, augmented by π-π stacking interactions, links the coordination polymer chains into a bilayer structure. Comparisons are made with some related Cu(II) complexes containing dca ligands and heteroaromatic co-ligands.

Keywords: 4-amino-3,5-bis(pyridin-2-yl)-4H-1,2,4-triazole; crystal structure; dicyanamide; hydrogen bonding; one-dimensional coordination polymer; polynitrile ligands; square-pyramidal CuII.