2D and 3D binuclear cobalt supramolecular complexes: synthesis and crystal structures

摘要

Three binuclear cobalt supramolecular complexes [(pda)(2)Co-2(H2O)(5)](DMF)(H2O) (1) (H(2)pda = pyridine-2,6-dicarboxylic acid), [(dbtO)Co-2(CH3CN)(H2O)(7)](CH3CN)(NO3)(3) (2) (dbto=4,6-di-1H-1,2,3-benzotriazol-1-yl-1,3,5-triazin-2-ol), and [(pyz)Co-2(H2O)(10)](SO4)(2)(H2O)(2) (3) (pyz = pyrazine) were synthesized through hydrothermal, solid-state and solution synthetic method, respectively. These supramolecular complexes have been structurally characterized by X-ray single crystal diffraction. The structure of (1) consists of binuclear neutral units, which show butterfly-like forms. In (2), the bent configuration of dbto has accommodated the formation of the horse-shoe-like unit. The two cobalt atoms in binuclear unit of (3) are equivalent since the unit has a symmetry center passing through the center of pyz. In each compound, all the units are held together by means of hydrogen bonds forming 3-D structure for (1) and (3) and 2-D structure for (2). (C) 2004 Elsevier B.V. All rights reserved.