## 2 Materials and Methods
### Synthetic Procedures  
The precursor compounds, dimethyl 5(4-bromobutoxy)isophthalate (**1**) and 2,3-bis[4-(3,5-dimethoxyylphenoxy)butylsulfonyl]maleonitrile (**2**), and the magnesium(II) tribenzoporphyrazine derivatives, 22,23-bis[4-(3,5-dibutoxycarbonylphenoxy)butylthio]-tribenzo[b,g,l] porphyrinazinot magnesium(II) (**3**) and 22,23-bis[4-(3,5-di(hydroxymethyl)phenyloxy)butylthio] tribenzo[b,g,l]porphyrinazinot magnesium(II) (**4**), were synthesized using previously published procedures [18; 20]. Metal-free tribenzoporphyrazine 22,23-bis[4-(3,5-dibutoxycarbonylphenoxy) butylsulfonyl]tribenzo[b,g,l]porphyrinazine was synthesized according to the literature procedure [21]. 2.1 22,23-Bis[4-(3,5-dibutoxycarbonylphenoxy)butylthio]-tribenzo[b,g,l]porphyrinazinot Zinc(II) (**6**)  
Magnesium(II) porphyrazine derivative **3** (107 mg, 0.086 mmol) was suspended in trifluoroacetic acid (5 mL) and stirred for 30 min in the dark at room temperature. The suspension was poured into an ice-water mixture, then neutralized with a saturated solution of sodium bicarbonate and extracted with dichloromethane. The organic layers were combined, the organic solvent was evaporated, and the dark blue solid residue was then subjected to column chromatography (dichloromethane/methanol 20:1) [21]. Metalfree Pz derivative **5** (92 mg, 0.075 mmol), \(N\),\(N\)-dimethylformamide (DMF, 25 mL), and zinc(II) acetate (41 mg, 0.225 mmol) were stirred in a round-bottomed flask under inert gas at 70 \({}^{\circ}\)C for 24 h. After that, the solvent was evaporated, and the residual blue oil was subjected to column chromatography (dichloromethane/methanol 50:1 then 20:1), leading to a ceruelan blue product **6** (79 mg, 71% yield). R\({}_{\rm f}\) = 0.71 (dichloromethane/methanol, 20:1, _v_/_v_). UV-Vis (dichloromethane) \(\lambda_{\rm max}\) nm (log \(\varepsilon\)) 227 (4.84), 352 (4.69), 649 (4.73), 692 (4.89). \({}^{1}\)HNMR (400 MHz, pyridine-\(d_{5}\)) \(\delta\) 9.65-9.70 (m, 4H, tribenzo-\(H\)), 9.58 (2d, \(J\) = 8 Hz, 2H, tribenzo-\(H\)), 8.31 (s, 2H, isophtalate-\(H\)), 8.26 (2d, \(J\) = 5.5 Hz, 2H, tribenzo-\(H\)), 8.18-8.23 (m, 4H, tribenzo-\(H\)), 7.55 (s, 4H, isophtalate-\(H\)), 4.67 (t, \(J\) = 7 Hz, 4H, PhOCH\({}_{2}\)), 4.22 (t, \(J\) = 7 Hz, 8H, C(O)OCH\({}_{2}\)), 4.00 (t, \(J\) = 6 Hz, 4H, SCH\({}_{2}\)), 2.26-2.39 (m, 8H, SCH\({}_{2}\)CH\({}_{2}\)), 1.48-1.55 (m, 8H, CH\({}_{2}\)CH\({}_{2}\)CH\({}_{3}\)), 1.22-1.31 (m, 8H, CH\({}_{2}\)CH\({}_{3}\)), 0.79 (t, \(J\) = 7 Hz, 12H, CH\({}_{3}\)). \({}^{13}\)C NMR (101 MHz, pyridine-\(d_{5}\)) \(\delta\) 165.7 (C = O), 159.6, 158.3, 157.8, 154.4, 153.5, 140.3, 140.1, 139.4, 138.7, 132.6, 131.1, 130.9, 130.4, 119.8, 68.3 (SCH\({}_{2}\)CH\({}_{2}\)), 65.6 (OCH\({}_{2}\)CH\({}_{2}\)CH\({}_{2}\)), 35.7 (CH\({}_{2}\)CH\({}_{2}\)), 31.1 (CH\({}_{2}\)CH\({}_{2}\)CH\({}_{3}\)), 28.9 (SCH\({}_{2}\)CH\({}_{2}\)CH\({}_{2}\)), 27.8 (SCH\({}_{2}\)CH\({}_{2}\)CH\({}_{2}\)), 19.7 (CH\({}_{2}\)CH\({}_{3}\)), 14.1 (CH\({}_{3}\)). MS (ESI): _m_/_z_: calcd. (C\({}_{68}\)H\({}_{71}\)N\({}_{8}\)O\({}_{10}\)S\({}_{2}\)Zn): 1287.4020 [M + H]\({}^{+}\), found: 1287.4015. 2.2.2 22.223-Bis[4-[3,5-di(hydroxymethyl))phenoxy]butylthio]tripenzo[b,g,l]porphyrinato Zinc(II) (7)  
Lithium aluminum hydride (13 mg, 0.353 mmol) was suspended in tetrahydrofuran (THF) precooled to \({}^{\circ}\)C and stirred for 30 min. Porphrazine derivative **6** (95 mg, 0.074 mmol) was dissolved in THF (14 mL), and the solution was added dropwise to the reaction mixture over 40 min. Next, the combined reagents were stirred for another 2 h at room temperature. After that, the saturated solution of NH\({}_{4}\)Cl (5 mL) was added, and the reaction mixture was stirred for 15 min. The reaction mixture was filtered through Celite, which was additionally washed with dichloromethane. Next, all solvents were evaporated to dryness using a rotary evaporator. Peacock blue residue was chromatographed (dichloromethane/methanol 20:1) to give **7** (67 mg, 90% yield) as a dark sapphire blue film.