University of Otago, New Zealand


Te Tari Hua-Ruanuku

Gordon Group Researchers

Natasha Lundin
Synthesis of dppz complexes

Researchers are currently developing multifunctional molecules that have the ability to transport electrons, transport holes and emit light. Molecules of this type could be used in applications such as organic light emitting devices (OLEDs). 1,3,4-Oxadiazole groups are often incorporated into these systems, due to their ability to transport electrons and facilitate charge separation, which helps to balance charge injection in the emitting molecule. Ruthenium(II) and rhenium(I) polypyridyl complexes are regularly used as the light-emitting segment of these molecules, as they are often highly luminescent, and their properties are readily tuned by the nature of the coordinated ligands. Dipyrido[2’,3’-a:3,2-c]phenazine (dppz) is one such polypyridyl ligand used in this role. To the best of our knowledge, a 1,3,4-oxadiazole ring has never been attached to dppz. We are attempting to synthesise ligands containing both an oxadiazole unit and a dppz unit (Figure 1), as well as other substituted dppz ligands (L) and some of their metal complexes ([Re(L)(CO)3Cl], [Cu(L)(PPh3)2]BF4, [Ru(L)(bpy)2](PF6)2). The properties of these compounds will be investigated by techniques such as UV-vis spectroscopy, fluorimetry, cyclic voltammetry, excited state lifetime measurements, UV-ottle and infrared spectroscopy to gain information about their emission capabilities, and electronic behaviour. The structural and electronic properties of these compounds will be investigated computationally by Penny Walsh.