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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| Numerous commercially available ligand with simple structures as donor and acceptor moieties can be engaged in
fabrication of one-dimensional (1D) materials. Metal coordination approach is an effective and facile method for
generating 1D luminescent nanowires with length ranging from several nanometres up to hundreds of nanometres
compared to the other methods available. In this research 1D photoluminescence pyrazine-based coordination
complexes were fabricated by integrating an electron-donor (D) tetra-2-pyridinylpyrazine (tppz) unit and
electron-acceptor (A) 2-phenylpyrimidine (ppm) moiety or 2,6-bis(2-benzimidazolyl)pyridine (bzimpy) to form a
D–A–D configuration. The tppz itself hardly fluoresces, but upon complexation with metal ions the fluorescence
of tppz-metal was observed. This may be resulting from the change of lowest excited-state due to complexation
with metal that acts as a strong Lewis acid. Tppz has been utilised as a bridging ligand in building block of
molecular wires which exhibits strong light absorption in yellow region. However, this limitation suppresses the
ability of tppz to be fully utilised in light harvesting. Pyrimidine and pyridine have good compatibility with tppz
and acts as a monodentate and tridentate ligands that potentially coordinate with numerous metal ions such as
nickel(II), copper(II) and zinc(II). Therefore, hybridization between tppz and another pigment moiety is an
alternative to overcomes this inadequacy and expands the potential of tppz to be employed in fabrication of
nanoscale functional materials such as photoanode in photocurrent generation system. |
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