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Self-Assembled Grid-Type Complexes of Manganese(II), Iron(II), Cobalt(II) and Zinc(II)

Ciesielski A., Wałęsa M., Patroniak V.

Polish Journal of Chemistry

2008

Vol. 82, nr 6

1231-1236

The self-assembly of the heterotopic ligand L, containing two N-tridentate binding units, with manganese(II), iron(II), cobalt(II) and zinc(II) carried out to the formation of supramolecular architectures containing four ions in octahedral coordination sites. The [2x2] grid-type structures have been characterized by the spectroscopic data and microanalyses.

Kompleksy kratkowe

Patroniak V.

Wiadomości Chemiczne

2004

[Z] 58, 1-2

59--79

The supramolecular chemistry is one of the most intensely developed fields of contemporary chemistry. Supramolecular chemistry may be defined as "chemistry beyond the molccule", bearing on the organized entities of higher complexity that result from association of two or more chemical species hold together by intermolecular forces [1]. Self-assembly involves the direct and spontaneous formation of a closed superstructure or polymer from a mixture of components (organic ligands, salts crystals, and sometimes molecules of solvents). The product exhibits a notable thermodynamic and kinetic stability and its components should contain all the information necessary for a correct assembly to occur. Self-assembly has recently been achieved in many types of organic and inorganic systems [2-I 1]. The inorganic self-assembly involves spontaneous generation of well-defined metallo-supramolecular architectures from mixtures of organic ligands and metal ions. This latter approach has proven particularly successful for the generation of a wide spectrum of architectural topologies such as for example, inorganic double [12-15], triple [16-20] and quadruple [21] helicates [22-25], rotaxanes [26-29], clusters [30-35], racks [36, 37], ladders [38, 39], cages [40-47], wheels [48, 49], grids [50-90] etc., based on ligand design and the application of suitable coordination geometries for the assembling system. Among them, there is an increasing interest in grid-type complexes, based on ligands containing oligopyridine type of sites and a various d-metal ions. The grids are the thermodynamically most stable motif when metal ions of octahedral coordination geometry are combined with a planar ligand containing tridentate binding sites. Such compounds may exhibit novel physical and chemical properties with interesting and useful potential applications in supramolecular engineering, nanotechnology, biomedical inorganic chemistry, biological catalysis, and in the area of sensors. Transistors incorporating complexes containing cobalt ion bonded to polypyridyl ligands have been reported recently, which is expected to be important in molecular electronics and in the study of the physics of nanoscale systems [91] The structure of grid-type complexes depends strongly on the ligand substituent, the ligand conformation, the metal ion, the counterion, the solvent, and the reaction conditions. The paper has been prepared on the basis of literature in the field and results of my own studies. The main contribution is a deseription of synthesis and characterization of the grid-type complexes, taking into regard their untypical properties and structure.