2. Results and discussion
2.1. The logic gate study of BODIPY derivatives 5 and 6
Monostyryl and distyryl-BODIPY derivatives were prepared by using literature procedures [4] and [6] (Scheme 1). The concentrations of fluorescent BODIPY derivatives 5 and 6 were prepared as 10 μM in each cell. When the compound 5 had fluorescence intensity at 575 nm in the 50% methanol-water mixture and excited at 522 nm, the fluorescence intensity of the compound 6 was seen at 660 nm and excited at 585 nm. The changes of the fluorescence intensity of the compounds 5 and 6 were measured for the each probability of the inputs (Cu2+ and EDTA). During in the experiments for monostyryl- BODIPY derivative 5, the concentration of Cu2+ions and EDTA were adjusted 500 μM and 1250 μM in cell, which required to have both or one of them i.e. 00, 01, 10 and 11 cases. In the quenching experiments for distyryl-BODIPY derivative 6, the concentration of Cu2+ ions and EDTA were set as 10 μM and 1000 μM, respectively. When the measurements were made in 50% methanol-water mixture for compound 5, 50% Me2SO-water mixture was used in the experiments for compound 6. According to fluorescent quenching results, truth tables were prepared by using Boolean formulation (Fig. 2). For this aim, while 1 was used for the value above threshold, 0 was used for the value under threshold. The threshold was chosen as 200 fluorescence intensity (a.u.) in the experiments for both compounds 5 and 6 (Fig. 1). The weak fluorescence emissions of the BODIPY derivatives 5 and 6 were observed only in the presence of Cu2+ ions. In other probabilities of the two inputs, any meaningful fluorescent quenching was not observed (Fig. 1). By adding EDTA chelating agent to the both 5-Cu2+ and 6-Cu2+solutions, the fluorescence intensity of the compounds 5 and 6 was gained back. Bar graphs in Fig. 1b and d presented the relative emission intensities of dyes 5 and 6 in the presence of each possibility of the inputs.