Journal Article

TOWARDS CYCLOMETALATED PLATINUM(IV) COMPLEXES WITH VERY LONG EXCITED STATE LIFETIMES

Murtahda, Batool, Jenkins, Dustin M

2017

Overview

Due to their strong luminescent properties, transition metal polypyridine complexes have garnered a great deal of attention, and are finding numerous applications in materials science, biomedicine, and catalysis. Strong spin-orbit coupling in these complexes leads to long triplet excited state lifetimes which are central to the development of materials and methods important to biomedicine such as optical blood gas sensors. The recent discovery of bis- and tris-cyclometalated platinum(IV) complexes has opened up new potential in this area as some of these complexes exhibit extreme sensitivity to molecular oxygen and lifetimes hundreds of microseconds long. Therefore, the synthesis of materials with very long lifetimes and a high sensitivity to triplet oxygen has been undertaken. New platinum(IV) complexes are being investigated using judicious modification of metal-ligand architectures to yield very long lifetimes. Efforts are focusing upon modifying the nature of the excited state to promote greater charge transfer through я system extension and constraint of ring rotation. Ligands are being synthesized using a combination of the Krohnke pyridine synthesis and Suzuki cross-coupling reactions. To synthesize bis- and tris-cylcometalated platinum(IV) complexes, cyclometalated platinum(II) pendant complexes will be oxidized using hypervalent iodine reagents followed by ligand substitution.

• Publisher: Ohio Academy of Science
• Subject: Catalysis / Charge transfer / Chemical reactions / Chemical synthesis / Coordination compounds / Coupling (molecular) / Cross coupling / Gas sensors / Iodine / Ligands / Materials science / Optical properties / Oxygen / Platinum / Pyridines / Reagents / Sensitivity / Spin-orbit interactions / Transition metals