Table 1 Analytical and some important physical measurements for L2 and C2

Preparation Method

Reflux

Hydrothermal

Color

Light brown

Dark brown

Aspect

Powder

Fine crystal

Melting Point (°C)

102

 > 300

Reaction Time

1 days

3 days

Yield (%)

97

90.4

Chemical Formula

C₁₁H₈N₄OS₂

C₂₈H₂₈CeClN₁₀O₄S₄

Molecular Weight (g/mol)

276.33

872.40

Elemental analysis (Calc.)/ Found

C %

(47.81)/ 46.95

(38.54)/ 37.62

H %

(2.91)/ 2.54

(3.23)/ 3.10

N %

(20.27)/ 20.11

(16.05)/ 15.52

S %

(23.20)/ 23.09

(14.69)/ 14.54

Characteristic infrared frequencies (cm⁻¹)

ν(OH)

3374

3426

ν(C = O)

–-

1813

ν(C = N)

1716

1757

ν(C-N)

1473

1380

ν(C = C)

1659

1624

ν(N–N)

1195

1127

ν(C–S)

754

757

ν(Ce–O)

–-

672

ν(Ce–N)

–-

528

UV‐ λ_max (nm)

378, 397, 424, 452

381, 415, 456, 631