## 2 Materials and Methods
### Dye Synthesis
#### 2.3.5 Synthesis of 5,5'-(Ethene-1,2-diyl)bis(2-(benzo[d]oxazole-2-yl)-N-benzylaniline) SbnBe  
**Intermediate 2** (23 mmol, 1 g) was dissolved in DMF (30 mL), and then potassium carbonate (68 mmol, 0.94 g) and benzyl chloride (69 mmol, 0.87 g) were added. The mixturewas heated to 60 \({}^{\circ}\)C and stirred for 8 h. Once the reaction was completed, the mixture was poured into water to form crystals upon standing at room temperature, then solids were isolated under vacuum filtration. The crystals were recrystallized using DMF. The product was further purified by column chromatography (adsorbent: silica gel, eluent: methanol/dichloromethane (5:95)), affording the final product in 56.1% yield. \({}^{1}\)H NMR (500 MHz, DMSO-d\({}_{6}\)), \(\delta\): 4.32 (d, 2H, CH\({}_{2}\)), 4.91 (d, 2H, CH\({}_{2}\)), 6.07 (d, 2H, ArH), 6.31 (d, 2H, NH), 6.67 (m, 6H, ArH), 6.85 (dd, 8H, ArH), 7.13 (t, 2H, CH), 7.31 (t, 2H, ArH) 8.21 (d, 2H, ArH); LCMS (\(m/z\)): [M + H]\({}^{+}\) calculated for C\({}_{40}\)H\({}_{28}\)N\({}_{4}\)O\({}_{2}\): 696.69; determined 696.79.  
3.6 Synthesis of 5,5\({}^{\prime}\)-(Ethene-1,2-diyl)bis(2-(benzo[d]oxazole-2-yl)-N-cyclopentaniline) SBnPy  
**Intermediate 2** (23 mmol, 1 g) and potassium carbonate (68 mmol, 0.94 g) were added to DMF (30 mL) followed by stirring the mixture at room temperature for 2 h until it was sufficiently dissolved. 1,4-dibromobutane (69 mmol, 1.49 g) was added, and the reaction was continuously = stirred at 100 \({}^{\circ}\)C for 1 hr. After the mixture was allowed to cool, it was poured into water, resulting in the formation of crystals upon standing at room temperature. The formed solids were isolated under vacuum filtration, and the crystals were recrystallized using DMF. The product was further purified by column chromatography (adsorbent: silica gel, eluent: Acetone/hexane(1:1)). The final product in 77.2% yield. \({}^{1}\)H NMR (500 MHz, DMSO-d\({}_{6}\)), \(\delta\): 1.82 (d, 4H, CH2), 1.94 (d, 4H, CH2), 3.45 (d,2H, CH2), 3.89 (d, 2H, CH2), 4.55 (t, 2H, CH2), 5.39 (d, 2H, CH2), 5.82 (d, 2H, CH), 6.12 (dd, 6H, ArH), 6.31 (dd, 4H, ArH), 6.39 (t, 2H, ArH), 8.18 (t, 2H, ArH) LCMS (\(m/z\)): [M + H]\({}^{+}\) calculated for C\({}_{36}\)H\({}_{32}\)N\({}_{4}\)O\({}_{2}\): 552.25; determined 552.61.  
3.7 Synthesis of 5,5\({}^{\prime}\)-(Ethene-1,2-diyl)bis(2-(benzo[d]oxazol-2-yl)-N-(sec-butyl)aniline) SB2 Bu  
SB2 Bu was synthesized using **intermediate 2** (23 mmol, 1 g) based on the SBnBu synthetic method using 2-bromobutane (69 mmol, 0.95 g) instead of 1-bromobutane, affording the final product in 55.9% yield. \({}^{1}\)H NMR (500 MHz, DMSO-d\({}_{6}\)), \(\delta\): 0.47 (t, 6H, CH\({}_{3}\)), 1.02 (t, 6H, CH\({}_{3}\)), 1.21 (s, 2H, CH\({}_{2}\)), 1.73 (d, 2H, CH\({}_{2}\)), 3.44 (d, 2H, CH), 5.29 (s, 2H, NH), 6.19 (s, 2H, ArH), 6.38 (d, 2H, ArH), 6.68 (s, 2H, CH), 7.06 (d, 6H, ArH), 7.28 (d, 2H, ArH), 8.14 (d, 2H, ArH); LCMS (\(m/z\)): [M + H]\({}^{+}\) calculated for C\({}_{36}\)H\({}_{36}\)N\({}_{4}\)O\({}_{2}\): 556.28; determined 556.66;  
3.8 Synthesis of (E)-N,N'-(Ethene-1,2-diylbis(6-(benzo[d]oxazol-2-yl)-3,1-phenylene)) diacetamide SBnAc  
SBnAc was synthesized under solvent-free condition using **intermediate 2** (23 mmol, 1 g). Acetic anhydride (Excess, 10 mL) and **intermediate 2** were stirred at room temperature for 5 h. When the reaction was completed, the remaining liquids were removed by a rotary evaporator. The product was then purified by column chromatography (adsorbent: silica gel, eluent: Acetone/n-hexane (1:1)). \({}^{1}\)H NMR (500 MHz, DMSO-d\({}_{6}\)), \(\delta\): 1.27 (s, 1H, CH3), 1.35 (s, 1H, CH3), 1.72 (d, 2H, CH3), 1.88 (s, 1H, CH3), 2.06 (s, 1H, CH3), 6.32 (d, 2H, ArH), 6.49 (d, 2H, ArH), 6.78 (d, 7H, ArH), 6.97 (s, 2H, ArH), 7.89 (d, 2H, ArH), 8.07 (s, 1H, NH), 9.04 (s, 1H, ArH), 9.23 (s, 1H, ArH); LCMS (\(m/z\)): [M + H]\({}^{+}\) calculated for C\({}_{32}\)H\({}_{24}\)N\({}_{4}\)O\({}_{4}\): 528.18; determined 528.61.