Three transition metal complexes with 3, 5-bis((4′-carboxylbenzyl)oxy)benzoic acid and 4′-(4-pyridyl)-2, 2′:6′, 2″-terpyridine: Syntheses, structures and properties. Issue 2 (1st February 2018) - Jiang, Da-Yu
ABSTRACT: Three transition metal complexes, [Cu(PYTPY)2 ]·Hbcb·2H2 O (1 ), [Ni(PYTPY)2 ]·Hbcb·2H2 O (2 ) and [Cd(H2 bcb)2 (PYTPY)] (3 ) [where, H3 bcb = 3, 5-bis((4'-carboxylbenzyl)oxy)benzoic acid, PYTPY = 4′-(4-pyridyl)-2, 2′:6′, 2″-terpyridine], were synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analyses reveal that the complexes1 and2 crystallize in the same monoclinic P2(1)/n space group with similar cell parameters. In complexes1 or2, an asymmetric unit contains one Cu 2+ /Ni 2+ ion, two PYTPY ligands, one free Hbcb 2− ligand and two free water molecules. The metal center is six-coordinate via six nitrogen atoms derived from two different PYTPY ligands in a distorted octahedral coordination geometry. The isostructural complexes1 and2 exhibit two dimensional supramolecular layer structures based on c-π stacking interactions and hydrogen bonds. And the complex3 crystallize in the triclinic P-1 space group. The discrete unit of3 consists of one Cd 2+ ion, two H2 bcb − and one PYTPY molecule. Each Cd 2+ ion is six-coordinated by three carboxylate oxygen atoms from two different H2 bcb − ligands, and three nitrogen atoms from one PYTPY molecule. Zero dimensional structure of3 is also further extended by π-π interactions and hydrogen bonds to form three dimensional supramolecular network. Furthermore, the complexes1 and2 exhibit relevant magnetic properties, and the complex3 exhibit photoluminescence at room temperature in the solid state.