3.2.1. Synthesis of [Zn4Cl2(ClQ)6]·2DMF (**1**)

HClQ (179 mg, 1 mmol) was dissolved in DMF (10 mL). Soon afterwards a solution of zinc chloride (136 mg, 1 mmol ZnCl<sup>2</sup> in 10 mL of ethanol) was added and mixed for a while at room temperature. After one month at room temperature, orange crystals of **1** were formed, filtered off and dried on air.

[Zn4Cl2(ClQ)6]·2DMF (**1**): Anal. Calc. for C60H44Cl8N8O8Zn<sup>4</sup> (1550.11 g·mol−<sup>1</sup> ): C, 46.35; H, 2.53; N, 6.64%. Found: C, 46.04; H, 2.56; N, 6.91%. Yield: 111.09 mg (43%). <sup>1</sup>H NMR (DMSO-d6): *δ* = 8.74 (1H, br s, H-2), 8.54 (1H, d, *J* 8.5 Hz, H-4), 7.95 (1H, s, HDMF-1), 7.75 (1H, dd, *J* 8.5, 4.5 Hz, H-3), 7.50 (1H, d, *J* 8.5 Hz, H-6), 6.73 (1H, br s, H-7), 2.89 (3H, s, HDMF-4), 2.73 (3H, s, HDMF-3) ppm. <sup>13</sup>C NMR (DMSO-d6): *δ* = 162.3 (C-8, CDMF-1), 145.6 (C-2), 139.7 (C-8a), 135.0 (C-4), 130.0 (C-6), 126.6 (C-4a), 122.8 (C-3), 111.6 (C-7), 109.0 (C-5), 35.8 (C-4DMF), 30.8 (C-3DMF) ppm. IR (ATR, cm−<sup>1</sup> ): 3047(vw), 2921(w), 2853(w), 1671(s), 1599(m), 1575(m), 1495(m), 1458(m), 1381(m), 1364(m), 1305(m), 1253(m), 1240(m), 1199(w), 1159(w), 1129(w), 1083(m), 1043(m), 961(m), 935(w), 838(m), 810(w), 783(m), 735(s), 672(m), 647(w), 638(w), 613(w), 590(w), 541(m), 504(m), 450(m).
