Table 1: Physicochemical and dc electrical conductivity data of ligand and its metal complexes.
| Compound | Color | Empirical formula | Elemental analysis found (Calcd.) | Solid-state electrical conductance | |||||
| & formula weight | C | H | N | Cl | M | σ (Ω−1 cm−1) (at 40 & 100 °C) | Ea (eV) | ||
| H2L | Reddish lemon | C13H12N4O2 256.25 |
61.12 (60.93) |
4.70 (4.72) |
21.86 (21.83) |
— | — | 4.37 × 10−12 3.90 × 10−11 |
0.440 |
| [Ti(L)(Cl)(H2O)2] | Dark umber | C13H13ClN4O4Ti 373.59 |
41.75 (41.79) |
3.75 (3.78) |
14.95 (15.00) |
12.75 (12.81) |
9.45 (9.49) |
1.62 × 10−12 9.54 × 10−11 |
0.766 |
| [Cr(L)(Cl)(H2O)2] | Deep scarlet | C13H14ClN4O4Cr 377.72 |
40.92 (41.34) |
3.15 (3.74) |
14.06 (14.86) |
13.82 (13.77) |
9.35 (9.39) |
1.62 × 10−12 9.54 × 10−11 |
0.765 |
| [Fe(L)(Cl)(H2O)2] | Umber | C13H14ClN4O4Fe 381.57 |
40.37 (40.92) |
3.68 (3.70) |
14.53 (14.68) |
14.60 (14.64) |
9.25 (9.29) |
7.34 × 10−10 2.16 × 10−9 |
0.748 |
| [WO2(L)(H2O)] | Avocado | C13H12N4O5W 488.10 |
33.06 (32.39) |
2.01 (2.86) |
11.90 (11.52) |
— | 37.08 (37.69) |
7.32 × 10−11 5.89 × 10−9 |
0.856 |
| [Th(L)(NO3)2(H2O)] | Mustard | C13H12N6O9Th 628.14 |
23.24 (24.84) |
1.90 (1.91) |
12.97 (13.37) |
— | 35.64 (36.94) |
7.32 × 10−12 5.89 × 10−10 |
0.759 |
| [UO2(L)(CH3OH)] | Terra cotta | C13H13N4O4U 556.92 |
30.53 (30.73) |
2.94 (2.61) |
10.05 (10.27) |
— | 42.03 (42.87) |
5.38 × 10−12 3.65 × 10−10 |
0.538 |