Fig. 4
From: Energy Transfer in Ce0.85Tb0.15F3 Nanoparticles-CTAB Shell-Chlorin e6 System
Schematic representation of the supposed arrangement of the components in the NP-CTAB-chlorin e6 nanosystem. In the symbol representing chlorin e6 molecule, the minus placed in the circle stands for the net negative charge of the molecule that could be due to some or all of its three carboxylic groups. Bromide counter ions of the CTAB molecules are not shown for simplicity