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Transcript
Development of Light-Harvesting Metallopolymers with Tunable
Optical and Electronic Properties
Manal A. Rawashdeh-Omary, Department of Chemistry and
Physics, Texas Woman’s University, Denton, TX 76204
This project aims to improve the optoelectronic properties of polymer-derived transition metal complexes tailored for potential use
in photovoltaics. Challenges in the coordination chemistry and electronic structure associated with using select organic polymers
as ligands to coordinate transition metal ions are being tackled. We have been synthesizing light-harvesting metallopolymers by
complexing polymers with heterocyclic aromatic groups (e.g., polypyridines and polythiophenes) to metal complex precursors of
the type MLnX (where M= metal; L= ligand; X= leaving group; in the example shown M = Pt(II); L = C6F5CC; X = tht).
N
*
*
m
n-m
F
F
+ F
N
F
F
Pt
F
n
S
F
S
- tht
F
F
F
F
N
F
F
F
Pt
F
F
F
F
*
F
F
N
*
m
n-m
N
The resulting metallopolymers exhibit charge transfer absorption bands that are red-shifted from the -* absorption bands in the
parent PVP polymer, as illustrated above. The absorption of these Pt(II)-PVP metallopolymers cover the majority of the visible
region, whereas PVP alone exhibits only UV absorption. Ongoing work seeks to alter the coordinating polymer, metal, and/or
Rational
synthesisrange
of ruthenium
small
molecule
“black
ligand to further expand
the absorption
to covermetallopolymers
the entire visibleand
region
resulting
in as
black
absorbers with better overlap
with the solar radiation.absorbers”
An example
of such
metallopolymers
and
molecules
is .illustrated below.
that
absorbRu(II)-based
across the entire
visible region
of small
the solar
radiation
MOLECULES IN BLACK!
Metal Precursor
Ligand
Products