Article: Synthesis, crystal structure and photoluminescence of the salts Cation+ [M(caffeine)Cl]− with Cation+=NnBu4+, AsPh4+ and M==Zn(II), Pt(II)
Zeitschrift für Naturforschung. 2019 Dec. 18, v. 74, no. 11-12
2019
Abstract: ... anions [M(II)(caffeine)Cl3]− with M = Zn and Pt show an absorption spectrum with an intense band at λmax ...
Abstract | The salts (NnBu4)[Zn(caffeine)Cl3] and (AsPh4)[Pt(caffeine)Cl3] 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)Cl3]− with M = Zn and Pt show an absorption spectrum with an intense band at λmax = 275 nm, which is attributed to an IL π–π* transition of the caffeine. A second band at ca. 300 nm is much weaker and largely obscured by the π–π* band. This second band is assigned to an IL n–π* transition. Both complex anions exhibit a photoluminescence (fluorescence), which originates from the n–π* state. The position of the n–π* state is recognized by the excitation band which distinctly overlaps with the fluorescence band. |
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Keywords | anions ; caffeine ; crystal structure ; fluorescence ; ligands ; photoluminescence ; platinum ; salts ; spectral analysis ; X-ray diffraction ; zinc |
Language | English |
Dates of publication | 2019-1218 |
Size | p. 885-889. |
Publishing place | De Gruyter |
Document type | Article |
ISSN | 1865-7117 |
DOI | 10.1515/znb-2019-0141 |
Database | NAL-Catalogue (AGRICOLA) |
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