Hybrid compounds offer attractive opportunities
to combine useful properties of both organic and inorganic simples within a
single molecular scale composite. On the one hand, these salts offer, scientifically
and technologically significant chances in different areas of catalysis,
optical properties, biology, magnetic functional materials. On the other hand,they may contribute to higher electrical mobility (as a result of the strongcovalent bonding within these systems). Halogenometalate hybrid compounds based
on elements of transition (II) ions prove to have a significant weight to
fabricate low-cost electronic devices (as Thin Film Transistor or Organice-
Inorganic Emitting Diode).
Among the most frequently used of polydentate
ligands which have the ability with bond to several metal centers, dipicolinic
acid (C7H5NO4, 2,6-pyridinedicarboxylic acid) is a well-known that occurs in
many natural compounds exhibiting various biological functions and potential
pharmacological activities. 2,6-pyridinedicarboxylic The ligand containing N
and O polydentate donors, which pave the way provide great advantages for
assembling compounds with new structures. The dipicolinic acid ‘dpc’ ligandwith Zn (II) ions has commonly 1 or 2 coordination modes. In one coordination
mode, a single planar dpc ligand associates in the equatorial plane of a Zn
(II) cation with other ligands such as H2O or pyridine-based heterocycles,
which occupy the remaining sites. This leads to the formation of square
pyramidal or octahedral coordination geometry or two perpendicularly
coordinated planar dipicolinic molecules generating distorted octahedral
coordination geometry.
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