“ALL-IN-ONE” METALLORGANIC COMPOUNDS FOR OPTO-ELECTRONIC APPLICATIONS
Simple Molecules – Different Assemblies – Diverse Applications
M R Ranga Prabhath, S Ravi P Silva, Peter D Jarowski
Introduction
The quest for “all-in-one” opto-electronic materials which can be used for a wide range of opto-electronic applications is
highly challenging. Fine-tunability of properties in opto-electronic materials is an important aspect in this quest. The
Combination of Organic - Inorganic components to achieve fine-tunability is emerging as a promising approach. Small
molecular metalloragnic compounds represent an important class in Organic – Inorganic hybrid materials.
Objectives
Results and Discussion
 The synthesis of donor acceptor ligand systems based
on pyridinyl-1,2,3-triazoles and their hybrid metal
complexes with different metal ions.
 The computational simulations with platinum group
metal ions indicated the formation of planar complexes
which is important in enhancing the communication
between donor and acceptor moieties. Planarity will
impart long range order with in the material increasing
the crystalinity crucial for conducting properties and
dense packing.
 Exploitation of the systems in different opto-electronic
applications and optimization of the systems.
Methodology
 The complexes are designed computationally
observe electronic distribution and arrangement
orbitals.
to
of
 Donor (D), Acceptor (A) and intermediate (B) Ligand
systems are synthesized mainly via Sonogashira coupling
and click-Chemistry approach as shown below.
Synthesized ligands are characterized by TLC, Mass
spectrometry, IR spectroscopy, 1H and 13C NMR
spectroscopy.
Donor Ligand
Intermediate Ligand
HOMO level of Donor-Pt(II)Acceptor complex
LUMO level of Donor-Pt(II)Acceptor complex
 Different Metal complexes indicated variety of colours
as shown below indicating the capability of fine-tuning
the energy gaps of the materials by changing the metal
ions and ligands.
Acceptor Ligand
 Formation
of metal complexes is carried out with
different metal ions such as Cu(II), Pd(II), Ni(II), Pt(II),
Ru(II) etc. with different proportions of ligands.
A-Ni(II)-D
A-Pd(II)-D
D-Pd(II)-B
D-Ni(II)-B
D-Pd(II)-D
D-Pt(II)-D
 The luminescence in symmetric metal complexes
indicates charge recombination whereas non-luminescent
asymmetric metal complexes may indicate charge
delocalization / charge separation.
Conclusion
Asymmetric D-Pd(II)-D complex
Symmetric D-Pd(II)-D complex
Preliminary characterization of the metal complexes are
carried out by UV- Vis Spectroscopy.
References
1. Jarowski, P. D.; Wu, Y.-L.; Schweizer, W. B.; Diederich, F. Org. Lett.,2008, 10,
3347.
2. Loren, J. C.; Sharpless, K. B. Sharpless Synlett,. 2005, 1514.
 Novel ligand systems and their metal complexes were
synthesized and characterized.
 Preliminary analysis of the compounds indicated finetunability of opto-electronic properties of the materials.
Future work
 Applications of the materials for OLEDS, Organic Solar
Cells and Non Linear Optical devices.
“Quantum nanotechnology shaping the future”