## 3 Experimental Section
229-231 \({}^{\circ}\)C. \({}^{1}\)H NMR (DMSO-_d\({}_{6}\)_): \(\delta\) 9.90 (t, 1H), 7.72 (s, 1H), 7.47 (s, 1H), 7.37 (s, 1H), 4.50 (d, 2H)  
Twelve compounds (**1**-**12**) were synthesized according to the following method. Substituted benzohydrazide (1 mmol) was dissolved in dry ethanol (30 mL). 1,5-diaza-fluorenone, 1,10-phenanthroline-5,6-dione, ferrocene-1,1'-dione, anthracene-9-carbaldehyde (1 mmol), dissolved in dry ethanol (20 mL), was added into the above solution. Then the mixture was heated under refluxing for 4 h and the precipitate was separated by filtration. The solid was recrystallized using ethanol, washed with diethyl ether, and dried under a vacuum. Compound **1**: Yield: 87%. m.p. \(>\) 320 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-_d\({}_{6}\)_, 298 K) \(\delta\) 12.05 (s, 1H), 8.76-8.72 (m, 2H), 8.55 (d, 1H), 8.23 (d, 1H), 8.03 (d, 2H) 7.65-7.48 (m, 5H). Elemental analysis: Calc. for C\({}_{18}\)H\({}_{12}\)N\({}_{4}\)O: C, 71.99; H, 4.03; N, 18.66; Found: C, 71.84; H, 4.39; N, 18.91. ESI-MS (_m/z_): 299.3 (M - H)\({}^{-}\). **Appul. Sci. 2015**, \(5\)  
Compound **2**: Yield: 83%. m.p. \(>\) 320 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 12.24 (s, 1H), 8.76-8.72 (m, 2H), 8.60 (d, 1H), 8.39 (d, 2H), 8.25-8.19 (m, 3H), 7.56-7.47 (m, 2H). Elemental analysis: Calc. for C\({}_{18}\)H\({}_{11}\)N\({}_{5}\)O\({}_{3}\): C, 62.61; H, 3.21; N, 20.28; Found: C, 63.02; H, 3.58; N, 20.47. ESI-MS (_m/z_): 344.2 (M - H)\({}^{-}\). Compound **3**: Yield: 80%. m.p. \(>\) 320 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 12.08 (s, 1H), 8.76-8.73 (t, 2H), 8.51 (d, 1H) 8.23 (d, 1H), 7.92 (s, 1H), 7.60-7.47 (m, 4H), 6.10 (s, 2H). Elemental analysis: Calc. for C\({}_{18}\)H\({}_{10}\)N\({}_{6}\)O\({}_{5}\): C, 55.39; H, 2.58; N, 21.53; Found: C, 55.44; H, 2.96; N, 21.62. ESI-MS (_m/z_): 389.0 (M - H)\({}^{-}\). Compound **4**: Yield: 91%. m.p. 236-239 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 11.32 (s, 1H), 10.19 (s, 1H), 9.42 (d, 2H), 8.97 (d, 1H), 8.91 (t, 1H), 8.55 (t, 1H), 8.38 (d, 1H), 7.69 (m, 5H). Elemental analysis: Calc. for C\({}_{19}\)H\({}_{12}\)N\({}_{4}\)O\({}_{2}\): C, 69.51; H, 3.68; N, 17.06; Found: C, 69.25; H, 3.87; N, 16.95. ESI-MS (_m/z_): 327.2 (M - H)\({}^{-}\). Compound **5**: Yield: 88%. m.p. 247-250 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 11.58 (s, 1H), 9.43 (s, 1H), 9.10 (d, 2H), 8.90 (t, 2H), 8.56 (d, 2H), 7.71 (m, 4H). Elemental analysis: Calc. for C\({}_{19}\)H\({}_{11}\)N\({}_{5}\)O\({}_{4}\): C, 35.20; H, 1.72; N, 23.94; Found: C, 35.48; H, 1.93; N, 23.57. ESI-MS (_m/z_): 376.2 (M - H)\({}^{-}\). Compound **6**: Yield: 84%. m.p. 306-308 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 15.15 (s, 1H), 9.09 (d, 2H), 8.88 (d, 2H), 8.61 (t, 2H), 7.80 (s, 1H), 7.73 (s, 1H), 7.64 (s, 1H). Elemental analysis: Calc. for C\({}_{19}\)H\({}_{10}\)N\({}_{6}\)O\({}_{6}\): C, 54.55; H, 2.41; N, 20.09; Found: C, 54.60; H, 2.76; N, 20.41. ESI-MS (_m/z_): 417.0 (M - H)\({}^{-}\). Compound 7: Yield: 89%. m.p. 200-201 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 10.52 (s, 2H), 7.81-7.44 (m, 12H), 4.73-4.43 (d, 8H), 2.20 (s, 6H) Elemental analysis: Calc. for C\({}_{28}\)H\({}_{28}\)FeN\({}_{4}\)O\({}_{2}\): C, 66.15; H, 5.55; N, 11.02; Found: C, 66.34; H, 5.73; N, 10.96. ESI-MS (_m/z_): 507.4 (M - H)\({}^{-}\). Compound **8**: Yield: 81%. m.p. 231-233 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 10.77 (s, 2H), 8.31-7.98 (m, 10H), 4.76-4.47 (d, 8H), 2.25 (s, 6H). Elemental analysis: Calc. for C\({}_{28}\)H\({}_{26}\)FeN\({}_{6}\)O\({}_{6}\): C, 56.20; H, 4.38; N, 14.04; Found: C, 56.51; H, 4.09; N, 14.42. ESI-MS (_m/z_): 597.2 (M - H)\({}^{-}\). Compound **9**: Yield: 90%. m.p. \(>\) 320 \({}^{\circ}\)C. \({}^{1}\)H NMR (400 MHz, DMSO-\(d_{6}\), 298 K) \(\delta\) 11.19 (s, 2H), 8.96-8.63 (m, 8H), 4.81-4.48 (d, 4H), 2.16 (s, 6H). Elemental analysis: Calc.