Intermolecular Interactions between Eosin Y and Caffeine Using ¹H-NMR Spectroscopy

Table 2

The ¹H-NMR chemical shifts (𝛿) in ppm of the caffeine protons in the samples of caffeine alone and in a mixture of caffeine and eosin Y.

Sample	H𝑎	H𝑏	H𝑐	H𝑑
Caffeine	3.34	3.50	3.95	7.90
Eosin Y + caffeine	3.19	3.39	3.77	7.67