Thesis On Coordination Polymers

The emphasis of this thesis is to design and synthesize innovative coordination polymers through crystal engineering, self-assembly, and hydrothermal synthesis.The thermal and magnetic properties of the coordination polymers are analyzed.Furthermore, Gd2O3 was demonstrated to be an excellent substrate for the growth of thin films of Ln CPs.

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The Zn II- and Cu II- complexes of the short alkyl chain ligands (n ≤ 5) exhibit 1D coordination polymeric structures with somewhat different conformations, whereas the ligands with longer alkyl chains (n ≥ 7) participate in forming Zn2L2 metallomacrocyclic structures.

As a result, the complexes of Cn COOH were further investigated for preparation as nanocrystal coordination polymers (NCPs).

However, only the complexes of Cn COOH could be crystallised to produce crystals of sufficient quality for X-ray structure determination.

The coordination geometries and complex topologies were found to be dependent on the alkyl chain length of the ligand Cn COOH.

By applying this method to alter both size and morphology, the NCPs have been observed to form two distinctive morphological structures: i) single elongated crystals of relatively uniform size and shape that are 28 ± 8 nm in length and 13 ± 4 nm in width, and ii) ultra-small seed crystals in the range of ~ 4-6 nm, which are clustered together giving rise to a raspberry-like morphology.

The NCPs were fully characterised and it was confirmed that the NCPs have the same crystal structure to that of their macroscale counterparts.