Ruthenium(II)-bis(4'-(4-ethynylphenyl)-2,2':6',2''-terpyridine) - A Versatile Synthon in Supramolecular Chemistry. Synthesis and Characterization
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Siebert, Ronald; Schl\", Florian; utter, ; Winter, Andreas; Presselt, Martin; Görls, Helmar; Schubert, Ulrich S.; Dietzek, Benjamin; J\", ; urgen Popp,
- Abstract:
- A homoleptic ethynyl-substituted ruthenium(II)-bisterpyridine complex representing a versatile synthon in supramolecular chemistry
was synthesized and analyzed by NMR spectroscopy, mass spectrometry and X-ray diffractometry. Furthermore, its photophysical
properties were detailed by UV/Vis absorption, emission and resonance Raman spectroscopy. In order to place the results obtained in
the context of the vast family of ruthenium coordination compounds, two structurally related complexes were investigated accordingly.
These reference compounds bear either no or an increased chromophore in the 4`-position. The spectroscopic investigations reveal a
systematic bathochromic shift of the absorption and emission maximum upon increasing chromophore size. This bathochromic shift
of the steady state spectra occurs hand in hand with increasing resonance Raman intensities upon excitation of the metal-to-ligand
charge-transfer transition. The latter feature is accompanied by an increased excitation delocalization over the chromophore in the
4`-position of the terpyridine. Thus, the results presented allow for a detailed investigation of the electronic effects of the ethynyl
substituent on the metal-to-ligand charge-transfer states in the synthon for click reactions leading to coordination polymers.
- Year:
- 2011
- Type of Publication:
- Article
- Journal:
- Central European Journal of Chemistry
- Volume:
- 9
- Pages:
- 990 - 999