Studies on Oligomer Metal Complexes Derived from Bisamic Acid of Pyromellitic Dianhydride and 4-Bromoaniline

Table 1

Physicochemical parameters of the ligand and its oligomer metal complexes.

Empirical formula of compound

Empirical weight (gm)

Color

Yield %

M.P.^a (°C)

Elemental analysis calc. (found %)

B.M.

DP

C

H

N

M

1

L; C22H14Br2N2O6

562.16

Light yellow

65

160^b

47.00; (46.89)

2.51; (2.46)

4.98 (4.92)

—

—

—

—

2a

[Mn–L–; C22H16Br2N2O8Mn

651.12

White

45

>250

40.58; (40.50)

2.48; (2.43)

4.30; (4.25)

8.44; (8.40)

5.54

3250

5

2b

[Fe–L–; C22H16Br2N2O8Fe

652.02

Light brown

58

>250

40.53; (40.45)

2.47; (2.42)

4.30; (4.23)

8.56; (8.50)

4.98

3901

6

2c

[Co–L–; C22H16Br2N2O8Co

655.11

Light pink

55

>250

40.33; (40.25)

2.46; (2.40)

4.28; (4.21)

9.00; (8.92)

4.25

3257

5

2d

[Ni–L–; C22H16Br2N2O8Ni

654.87

Light green

63

>250

40.35; (40.30)

2.46; (2.41)

4.28; (4.26)

8.96; (8.92)

2.87

3250

5

2e

[Cu–L–; C22H16Br2N2O8Cu

659.73

Green

70

>250

40.05; (40.00)

2.44; (2.38)

4.25; (4.21)

9.63; (9.58)

1.99

3941

6

2f

[Zn–L–; C22H16Br2N2O8Zn

661.56

White

45

>250

39.94; (39.88)

2.44; (2.39)

4.23; (4.17)

9.88; (9.82)

D

3312

5

Melting points were checked by standard open capillary method and were found uncorrected; uncorrected.
  B.M.: magnetic moment, : number of average molecular weights, DP: degree of polymerization, and D: diamagnetic.