Synthesis, crystal engineering, and magnetic properties of an anionic 4-terpyridone based copper(II) azide supramolecule containing dinuclear–mononuclear cocrystal

• Published in: Polyhedron 2008-08, Vol.27 (12), p.2693-2697
• Main Authors: Liao, Chun-Yuan, Nayak, Malabika, Wei, Ho-Hsiang, Mohanta, Sasankasekhar
• Format: Article
• Language: English
• Subjects: 4-Terpyridone; Azide-bridged; Cocrystal; Hydrogen-bond; Magnetic properties; Tetracopper(II)
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2008.05.027

Synthesis, crystal engineering, and magnetic properties of an anionic 4-terpyridone (L) based three-dimensional supramolecule, [ Cu 2 II (L) 2(μ 1,1-N 3) 2] · 2[Cu II(L)(N 3)(H 2O)] · 6H 2O, have been described. In this compound, one dinuclear [ Cu 2 II (L) 2(μ 1,1-N 3) 2] unit is cocrystallized with two mononuclear [Cu II(L)(N 3)(H 2O)] units. Eight O–H⋯O type strong hydrogen bonds involving the oxygen centers of anionic 4-terpyridone ligand and water molecules link the components into a three-dimensional framework containing hydrogen bonded sheets interlinked by the dinuclear [ Cu 2 II (L) 2(μ 1,1-N 3) 2] unit. Synthesis, crystal engineering, and magnetic properties of an anionic 4-terpyridone (L) based three-dimensional supramolecule, [ Cu 2 II (L) 2(μ 1,1-N 3) 2] · 2[Cu II(L)(N 3)(H 2O)] · 6H 2O ( 1), have been described in the present investigation. The title compound crystallizes in the monoclinic space group C2/ c with the following unit cell parameters: a = 27.803(7) Å, b = 14.361(4) Å, c = 16.071(4) Å, β = 99.09(2)°, and Z = 4. In this compound, one dinuclear [ Cu 2 II (L) 2(μ 1,1-N 3) 2] unit is cocrystallized with two mononuclear [Cu II (L)(N 3)(H 2O)] units. In both the dinuclear and mononuclear species, 4-terpyridone chelates to the metal centers in its anionic form. The coordination environment of the metal ions is distorted square pyramidal. Eight O–H⋯O type strong hydrogen bonds involving the oxygen of anionic 4-terpyridone ligand and water molecules link the components of 1 into a three-dimensional framework. Excluding the atoms except the water molecules and ligand oxygens, the topology is a two-dimensional network. The mononuclear [Cu II(L)(N 3)(H 2O)] moiety is appended from this sheet, while the neighboring sheets are interlinked by the dinuclear [ Cu 2 II (L) 2(μ 1,1-N 3) 2] unit to add the third dimension of the overall three-dimensional structure of the title compound.