Vn Veronica Marin

Synthesis and Copper(i) Complexation of 3,6-Di(2-pyridyl)pyridazine and 2,2′-Bipyridine Ligands Functionalized with a Dangling Iridium(iii) Complex

The combination of multiple metal complexes into single heterometallic architectures is of interest to study energy and electron transfer processes. In this contribution, the synthesis and characterization of iridium(iii) complexes with pendant dipyridyl–pyridazine and bipyridine moieties are reported. The successful coupling of an amino-functional mixed ligand IrIII complex was performed by a carbamate linkage using carbonyl-diimidazole-activated ligands. Characterization by 1H NMR spectroscopy, MALDI-TOFMS, and elemental analysis proved the purity of the synthesized complexes. Further, the complexation of these ligands with copper(i) ions and the effect of complexation on the phosphorescence of the IrIII complex are discussed, whereby model complexation studies were performed to further understand the observed quenching behaviour.

Capillary zone electrophoresis of iridium(III) and ruthenium(II) polypyridyl complexes in non-aqueous solvents

Abstract A method of non‐aqueous capillary zone electrophoresis has been optimised for the characterisation of five functionalised mixed‐ligand iridium(III) polypyridyl complexes and four functionalised ruthenium(II) bis‐terpyridine complexes. Their mobilities, the relation to their molar mass and the capillary lifetime (measured in number of injections) have been determined.

Synthesis and surface assembly of ruthenium bipyridine complexes

Disulfide-functionalized bipyridine and the corresponding thiol derivative were prepared starting from xanthogenate-functionalized bipyridine. The reduction of the xanthogenate by hydrazine led to the formation of a mixture of thiol and disulfide-functionalized bipyridines that could be separated by size exclusion chromatography. The chelating properties of the bipyridine units were used to prepare fluorescent heteroleptic ruthenium complexes, whereas the thiol or disulfide group on the other end of the molecule was used to anchor the individual ligands as well as the formed complexes to solid substrates. Scanning tunnelling microscopy was used to visualize the assembly of these species on a flat gold(111) substrate.

A novel light-emitting mixed-ligand iridium(III) complex with a polymeric terpyridine-PEG macroligand: Synthesis and characterization

The synthesis of mixed ligand orthometalated iridium(III) complexes as well as the characterization of their electro-optical properties is briefly illustrated. The cyclic voltammetry results exemplify an enhanced stability of the complex with a poly(ethylene glycol (PEG) side chain compared to the corresponding organometallic model material. Less degradation of the electrically active centers was found to occur on the electrode surface. Furthermore the morphology of thin films of the described polymeric material was investigated with respect to potential applications in thin film devices.