The model was refined with version 2018/3 of Shelxl using least-squares minimizations.
The structures were solved with the Shelxt structure solution program using Olex2 as the graphical interface. The crystals were kept at a steady temperature of 123 K during data collection. Suitable crystals were fixed on MITIGEN holders using a perfluorinated oil and mounted on a GV50 Rigaku diffractometer with a TitanS2 detector for the data collection of ( 1), respectively on a Supernova Agilent diffractometer equipped with an Atlas detector for the data collection of ( 2). – Analysis (C 32H 30AsCl 3N 4O 2Pt): Calcd. It was collected by filtration, washed with water and dried in a vacuum: (AsPh 4). To an aqueous solution of K was added an aqueous solution of (AsPh 4)Cl. – Analysis (C 24H 52Cl 3N 5O 5Zn): Calcd. This mixture was kept in a refrigerator overnight until colorless crystals precipitated, which were collected by filtration and washed with a small amount of ice-cold water and dried in a vacuum this product was recrystallized from water: (N nBu 4)×3H 2O. After cooling, an aqueous solution of (N nBu 4)triflate was added. ZnCl 2 and caffeine were dissolved in water at relatively high concentrations (ca. 2 Experimental 2.1 Synthesis of (N nBu 4) (1) Especially, structural properties need to be elucidated as the basis for understanding the optical behavior. Some information about these anions is already available, , but supplementary observations are still required. The excited state properties of metal caffeine complexes are virtually unknown.Īccording to these considerations it was decided to study the complex anions − with M=Zn and Pt. A further important aspect of such metal complexes is their photoluminescence, which may be used for diagnostic and therapeutic purposes. Generally, zinc plays a remarkable role as a bioactive metal, while platinum compounds such as cisplatin are used for cancer therapy. In the context of their biological and medical significance, zinc and platinum are of special interest.
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