Abstract
Three differently substituted alkyne phenanthrolines have been synthesized in high yields and the molecular structure in the solid state is confirmed by X‐ray diffraction. Synthesis of the corresponding ruthenium polypyridine complexes is feasible without metal carbonyl formation. The photophysical and electrochemical properties of the compounds reveal that substitution of the phenanthroline in the 5‐position leads to a pronounced effect in the absorption properties of the uncomplexed ligands as well as a significant shift of the redox potentials of the complexes. However, no effect on the energy of the MLCT transition and emission could be detected. This rather contradictory behavior is further analyzed by TD‐DFT calculations.
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