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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