Entangled zinc–ditetrazolate frameworks involving in situ ligand synthesis and topological modulation by various secondary N-donor ligands

Abstract The introduction of various secondary N-donor ligands into an in situ ditetrazolate-ligand synthesis system of terephthalonitrile, NaN 3 and ZnCl 2 led to the formation of three new entangled frameworks Zn(pdtz)(4,4′-bipy)·3H 2 O ( 1 ), [Zn(pdtz)(bpp)] 2 ·3H 2 O (2) and Zn(pdtz) 0.5 (N 3 )(2,2′-bipy) (3) (4,4′-bipy=4,4′-bipyridine; bpp=1,3-bis(4-pyridyl)propane; 2,2′-bipy=2,2′-bipyridine; H 2 pdtz=5,5′-1,4-phenylene-ditetrazole). The formation of pdtz 2− ligand involves the Sharpless [2+3] cycloaddition reaction between terephthalonitrile and NaN 3 in the presence of Zn 2+ ion as a Lewis-acid catalyst under hydrothermal conditions. Compound 1 exhibits a fivefold interpenetrating 3D framework based on the diamondoid topology. Compound 2 displays a twofold parallel interpenetrating framework based on the wavelike individual network. Compound 3 possesses a 2D puckered network. These new Zn–ditetrazolate frameworks are highly dependent on the modulation of different secondary N-donor ligands. Their luminescent properties were investigated.