3.2.3. Synthesis of [Cu(ClBrQ)2]·1/2 Diox (**2**)

HClBrQ (25.9 mg, 0.1 mmol) was dissolved in 1,4-dioxane (10 mL) and warmed to 60 ◦C. While continuously stirring, 10 mL ethanol solution of CuCl<sup>2</sup> (8.5 mg of CuCl2·2H2O, 0.05 mmol) (warmed to 60 ◦C), was added. After 30 min of stirring, the beaker was laid down and the precipitate of **2** formed during stirring was filtered off. Mother liquor was laid to crystallise at room temperature. After five days, yellow needles of **2** had formed, and were filtered off, and dried in the air. The identity of the powder and crystals was verified by IR spectroscopy.

[Cu(ClBrQ)2]·1/2 diox (**2**)—Calc. for C20H12Br2Cl2N2O3Cu (622,58 g·mol−<sup>1</sup> ): C, 38.58; H, 1.94; N, 4.50%. Found: C, 38.34; H, 1.92; N, 4.42%. IR (ATR, cm−<sup>1</sup> ): *ν*(C–H)ar 3079 (vw), *ν*(CH2) 2965 (w), 2912 (w), 2887 (w), 2849 (m), *ν*(C=C)ar 1592 (w), 1577 (w), 1553 (m), 1486 (m), *ν*(C=N) 1448 (m), *ν*(C–C) 1369 (s), 1253 (m), 1139 (m), *ν*(C–O) 1113 (m), *β*(C–H) 1045 (m), *ν*(C5–Cl) 975 (m), *ν*(C7–Br) 873 (m), *γ*(C–H) 805 (m), Ring breathing 779 (m), 613 (w), 750 (m), 728 (m), *β*(CCC) 657 (s), *β*(CNC) 594 (m), *β*(C5–Cl) 509 (w), γ(CCC) 482 (m).

### 3.2.4. Synthesis of [Cu(BrQ)2] (**3**)

HBrQ (22.4 mg, 0.1 mmol) was dissolved in 10 mL of ethanol and warmed to 60 ◦C. While continuously stirring, 10 mL of 1,4-dioxane solution of CuCl<sup>2</sup> (CuCl2·2H2O of 8.5 mg, 0.05 mmol) (warmed to 60 ◦C) was added. After 30 min of stirring, the beaker was laid down at room temperature. After five days, yellow needles of **3** had formed, and were filtered off, and dried in the air.

[Cu(BrQ)2] (**3**)—Calc. for C18H10Br2Cl2N2O2Cu (509.64 g·mol−<sup>1</sup> ): C, 42.42; H, 1.98; N, 5.50%. Found: C, 42.57; H, 2.10; N, 5.37%. IR (ATR, cm−<sup>1</sup> ): *ν*(C–H)ar 3054 (vw), *ν*(C=C)ar 1584 (m), 1561 (s), 1483 (s), *ν*(C=N) 1453(s), *ν*(C–C) 1371 (s), 1259 (m), 1231 (m), 1219 (m), *ν*(C–O) 1112 (m), *β*(C–H) 1041 (m), *ν*(C7–Br) 861 (m), *γ*(C–H) 821 (m), Ring breathing 786 (m), 751 (s), *β*(CCC) 654 (s), *β*(CNC) 599 (w), 587(w), *β*(C–O) 555 (m), γ(CCC) 482 (m).

## 3.2.5. Synthesis of [Cu(dNQ)2] (**4**)

HdNQ (23.5 mg, 0.1 mmol) was dissolved in methanol (10 mL) and warmed to 60 ◦C. While continuously stirring, solution of CuCl<sup>2</sup> (8.5 mg of CuCl2·2H2O, 0.05 mmol) in dimethoxyethane (10 mL, warmed to 60 ◦C) was added. After 30 min of stirring, the precipitate of **4** was filtered off and dried in the air.

[Cu(dNQ)2] (**4**)—Calc. for C18H8N6O10Cu (531,84 g·mol−<sup>1</sup> ): C, 40.65; H, 1.52; N, 15.80%. Found: C, 41.04; H, 1.88; N, 15.48%. IR (ATR, cm−<sup>1</sup> ): *ν*(C–H)ar 3056 (vw), *ν*(C=C)ar 1594 (m), 1518 (m), 1492 (m), *ν*(N–O)as 1567 (m), *ν*(C=N) 1453 (m), *ν*(C–C) 1405 (w), 1379 (m), 1255 (m), *ν*(N–O)sym 1321 (m), *β*(C–H) 1169 (m), 1155 (m), 1016 (w), *ν*(C–O) 1113 (m), *δ*(NO2) 928 (m), 699 (m), *γ*(C–H) 831 (m), 797 (m), Ring breathing 749 (s), 733 (w), *β*(CCC) 655 (m), *β*(CNC) 592 (w), *β*(C–O) 530 (m), *γ*(CCC) 457 (m).
