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