Research Article
Preparation and Characterization of Di-, Tri-, and Tetranuclear Schiff Base Complexes Derived from Diamines and 3,4-Dihydroxybenzaldehyde
Table 1
The physical properties and analytical data for Schiff bases and their metal complexes.
| Symbol | Color | (m.p.) °C | Yield % | CHN % analysis found (Calc.) | M % found (Calc.) | Cl % found (Calc.) | C % | H % | N % |
| EDH4 | Yellow | 210 dec. | 67.07 | 65.04 (64.00) | 5.77 (5.33) | 9.78 (9.33) | — | — | PDH4·4H2O | Dark brown | 240 | 30.03 | 57.78 (57.14) | 3.84 (4.28) | 7.32 (6.66) | — | — | MPDH4·MeOH | Pale yellow | 222 | 56.82 | 67.50 (67.60) | 6.24 (5.88) | 7.72 (6.86) | — | — | C1 | Brown | >280 | 68.92 | 53.29 (53.52) | 4.31 (4.46) | 10.39 (10.40) | 16.05 (15.74) | — | C2 | Dark brown | >280 | 37.55 | 52.77 (53.65) | 4.46 (4.51) | 8.92 (9.38) | 14.95 (14.20) | — | C3 | Brown | >280 | 62.24 | 46.00 (45.89) | 3.79 (3.09) | 8.25 (7.64) | 23.79 (23.14) | 12.57 (12.93) | C4 | Dark brown | >280 | 67.53 | 44.67 (44.18) | 3.78 (4.09) | 7.80 (8.59) | 19.92 (19.50) | 7.47 (7.26) | C5 | Dark brown | >280 | 76.95 | 47.77 (47.84) | 3.90 (3.12) | 10.14 (9.71) | 16.00 (16.52) | 5.55 (6.15) | C6 | Dark brown | >280 | 63.57 | 46.23 (46.65) | 3.82 (3.88) | 9.13 (8.37) | 14.98 (14.25) | 5.82 (5.31) | C7 | Dark brown | >280 | 26.10 | 37.78 (37.70) | 4.22 (4.04) | 6.85 (7.29) | 20.85 (20.44) | 12.11 (12.32) | C8 | Dark green | >280 | 26.68 | 55.44 (55.20) | 5.32 (4.99) | 9.90 (9.99) | 13.74 (14.02) | 6.03 (5.63) | C9 | Dark brown | >280 | 68.06 | 59.50 (58.76) | 4.55 (3.81) | 11.73 (11.42) | 17.93 (17.28) | — | C10 | Dark brown | >280 | 86.26 | 59.38 (59.91) | 4.15 (3.74) | 9.61 (10.48) | 16.54 (16.22) | — | C11 | Brown | >280 | 77.00 | 58.39 (58.26) | 4.12 (4.39) | 8.92 (9.71) | 15.22 (14.69) | — | C12 | Dark brown | >280 | 52.56 | 36.24 (37.04) | 4.02 (3.43) | 7.9 (7.20) | 22.42 (21.79) | 11.59 (12.17) | C13 | Brown | >280 | 57.05 | 45.80 (46.25) | 4.12 (4.40) | 8.33 (7.70) | 16.47 (17.49) | 7.08 (6.51) | C14 | Reddish brown | >280 | 93.03 | 51.24 (50.64) | 3.90 (4.52) | 10.53 (10.20) | 15.23 (14.54) | 5.14 (5.41) | C15 | Brown | >280 | 65.50 | 45.18 (45.81) | 3.96 (3.66) | 7.93 (8.55) | 13.91 (14.55) | 6.05 (6.07) |
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