Encapsulated different forms of water molecules by Cu(ii) complexes with diverse structures

Abstract

Three new supramolecular copper complexes have been prepared possessing different frameworks to host different forms of water. The 1D chain complex {[Cu(terpyOH)(phth)]·H2O}n (1), the binuclear complex [Cu2(terpyO)2(phth)(H2O)2]·11H2O (2), the mononuclear complex [Cu(terpyOH)(SO4)(H2O)]·2H2O (3) (terpyOH = 4′-hydroxy-2,2′:6′,2′′-terpyridine and phth = phthalate) were obtained by changing pH values (1, 2) and in situ reaction (3). Their structures were characterized by single crystal X-ray diffraction analysis. In complex 1, the CuII ions are bridged by phthalate dianions to form infinite Z-shaped chains with terpyOH pendants and discrete water molecules. Coexistence of (H2O)16 and (H2O)10 water clusters in the complex 2 forms a novel 2D water sheet. A near-planar S-shaped water chain assembled by hydrogen bonds is formed for 3. The 4′-bromo-2,2′:6′,2′′-terpyridine was converted into terpyOH in situ under hydrothermal conditions for complex 3.