Syntheses, Structures and Properties of 4′-(3-Methoxy-4-Hydroxyphenyl)-2,2′∶6′,2″-Terpyridine Together with Copper and Zinc Complexes

The ligand 4′-(3-methoxy-4-hydroxyphenyl)-2,2′ ∶6′,2″-terpyridine(L) and its transition-metal complexes have been prepared. The crystal structures of(HL)(CH3COO)(1), [Cu(NO3)(CH3OH)L](NO3)(2) and[Zn(NO3)2L](C2H5OH)(3) have been determined by single crystal X-ray diffraction. The result demonstrated that the three pyridine rings in crystal 1 were trans-trans conformation and one pyridine nitrogen atom is protonated,while the three pyridine rings of the ligand in crystal 2 and 3 were cis-cis conformation and they adopted tridentate chelating mode to link metal ions into mononuclear units. Further, these mononuclear units are assembled into 3D networks by hydrogen bonds, π-π stacking interactions and Van der Waals force.