Vogler, Arnd and Hischa, Birgit and Stempfhuber, Sabine (2019) Synthesis, crystal structure and photoluminescence of the salts Cation(+) [M(caffeine)Cl](-) with Cation(+) = (NBu4+)-Bu-n, AsPh4+ and M = Zn(II), Pt(II). ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 74 (11-12). pp. 885-889. ISSN 0932-0776, 1865-7117
Full text not available from this repository. (Request a copy)Abstract
The salts ((NBu4)-Bu-n)[Zn(caffeine)Cl-3] and (AsPh4) [Pt(caffeine)Cl-3] were prepared and their crystal structures determined by single crystal X-ray diffraction. The free ligand caffeine, as well as the complex anions [M(II)(caffeine)Cl-3](-) with M=Zn and Pt show an absorption spectrum with an intense band at lambda(max) = 275 nm, which is attributed to an IL pi-pi* transition of the caffeine. A second band at ca. 300 nm is much weaker and largely obscured by the pi-pi* band. This second band is assigned to an IL n-pi* transition. Both complex anions exhibit a photoluminescence (fluorescence), which originates from the n-pi* state. The position of the n-pi* state is recognized by the excitation band which distinctly overlaps with the fluorescence band.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CAFFEINE; COMPLEXES; caffeine; crystal structure; photoluminescence; platinum; zinc |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Arnd Vogler |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Mar 2020 05:52 |
| Last Modified: | 24 Mar 2020 05:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25762 |
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