Benzenedicarboxylate-modulated zinc(II)-3,5-bis(3-pyridyl)-1H-1,2,4-triazole frameworks: syntheses, structures and luminescent properties

摘要

Based on the polydentate ligand 3,5-bis(3-pyridyl)-1 H -1,2,4-triazole (3,3′-Hbpt), three coordination compounds [Zn(3,3′-Hbpt)(ip)]·2H _2 O (1), [Zn(3,3′-Hbpt)(5-NO _2 -ip)]·H _2 O (2), and [Zn(3,3′-Hbpt) _2 (H _2 pm)(H _2 O) _2]·2H _2 O (3) have been hydrothermally constructed with H 2 ip, 5-NO 2 -H 2 ip and H 4 pm as auxiliary ligands (H _2 ip = isophthalic acid, 5-NO _2 -H _2 ip = 5-NO _2 -isophthalic acid, H 4 pm = pyromellitic acid). Structural analysis reveals that Zn(II) ions serve as four-coordinated, five-coordinated, and six-coordinated connectors in 1 - 3, respectively, while 3,3′-Hbpt adopts μ-N py and N py coordination modes in two typical conformations in these target coordination compounds. Dependently the applied ligand, compounds 1 - 3 exhibit either 1D channel, cage or chain structures, respectively. In addition, the luminescence properties of 1 - 3 have been investigated in the solid state at room temperature. Graphical Abstract Based on the versatile ligand 3,5-bis(3-pyridyl)-1H-1,2,4-triazole(3,3′-Hbpt) and R-benzenedicarboxyl (R = H, NO 2, and COOH), three coordination compounds have been prepared, the structures of which are 1D channel, cage and chain, respectively. The influences of the substituted groups of benzenedicarboxyl ligands on the structures of the resultant crystalline materials are discussed. More over, the luminescence properties of the compounds have been investigated in the solid state at room temperature.