Compound

M.p. (˚C),

Color

Found (Calcd.)%

¹H-NMR

Chemical shift (δ ppm)**

μ_eff

M⁺

L*

pK_a

y

C

H

N

M

HNB, L₁ C₁₇H₁₄N₂O₃S

154 Yellowish brown

63.3

(62.6)

4.2 (4.3)

8.9 (8.6)

-

11.6 (NH, s)^a, 11.2 (OH, s)^a, 8.85 (CH=N, s),

326

326.4

6.5

[Cu(L₁)₂]_n∙nH₂O

206 Yellowish brown

55.9

(55.8)

4

(3.9)

-

8.2 (8.7)

1.82

-

8.1

[Ni(L₁)₂.(EtOH)_1/2]_n∙2nH₂O

>300 Pale green

58.3

(57.4)

4.5

(4)

-

7.9

(8.0)

11.6 (NH, s)^a, 9.0 (CH=N, s), 10.0 (EtOH, s)^a, 6.9 - 8.2 (naphthyl and phenyl rings, m)

Diamag.

-

15.0

[Co(L₁)₂]_n

>300 Brick red

57.5

(57.4)

3.7

(4)

-

8.3

(8.0)

2.34

-

18

HNT, L₂ C₁₈H₁₆N₂O₃S

172 Yellowish white

64

(63.5)

4.6

(4.7)

8.7

(8.2)

9.8 (NH, s), 9.4 (OH, s)^a, 7.0 (CH=N, s), 1.4 (CH₃, s), 5 - 7 (naphthyl and phenyl rings, m)

340

340.4

9.5

[Cu(L₂)₂]∙1/2EtOH

222 Yellowish brown

59

(58.1)

4

(4.3)

-

7.9

(8.3)

2.06

-

13

[Ni(L₂)₂∙(EtOH)_1/2]

291 Pale green

59.1

(58.4)

4.4

(4.4)

-

7.3

(7.7)

Diamag.

-

11

[Co(L₂)₂]∙1/2EtOH∙1/2H₂O

249 Brown

57.6

(57.7)

4.2

(4.5)

-

8.0

(7.7)

2.5

-

18