10
AL-JANABI ET AL.
2,934w, 2,856 m, 1,497 s, 1,451 s, 1,006 m, 561 m, 469w
cm−1. Melting point: 256–257ꢀC (Decompose).
trypsin-version solution to the tissue culture flask (size
25 cm2), then 20 ml of the RPMI-1640 medium was
added with fetal calf serum (FCS). The cells were mixed
and 0.2 ml was transferred from each mixture into each
of the 96 wells using a fine automatic pipette. The plates
were left in the incubator at 37ꢀC for 18–24 hr until the
adhesion of cells in the well, then the old media from
wells were removed, 0.2 ml of the prepared concentra-
tions of dithiocarbamate ligands were added using the
Serum-free media (15.1, 31.2, 62.5, 125, 250, 400, and
500 μg/ml) with three replicates per a concentration. In
addition, 0.2 ml of the prepared concentrations of each
complexes were added using the Serum-free media
(500 μg/ml) only. Four replicates were performed using
DMSO (dimethyl sulfoxide) as a negative control and four
replicates were added to PBS supplemented with 0.2 ml
of serum free medium assay positive control and plates
were incubated at 37ꢀC for 24 hr according to the method
mentioned. The plate was taken out from the incubator
and 50 μl of crystal violet stain per well was added then
returned to the incubator for 20 min. After that, the con-
tents were removed and washed with PBS until the
excess dye was removed and the cells were allowed to
dry. The results were read using the optical spectroscopy
device at a wave length of 492 nm. The rate was deter-
mined to inhibit the growth of cancer cells according to
the following equation:
[Ni(κ2-PyDT)2] (7). Yellowish blue. Yield: 86%. Anal.
calc. For C10H16NiN2S4: C, 34.20; H, 4.59; N, 7.98; S,
36.52. Found: C, 34.42; H, 4.81; N, 8.07; S, 36.39%. Molar
conductivity in DMF: 8.71 (Ω−1 cm−1 mol−1). IR (KBr)
2,974 w, 2,834 w, 1,517 s, 1,434 s, 1,006 s, 571 s, 456 w
cm−1. δ 1H NMR (DMSO-d6): δ 2.04 (m, 8H, 4CH2 ); 3.75
B
(m, 8H, 4CH2A) ppm. 13C NMR (DMSO-d6): δ195.42
B
(CSS); 45.33 (CH2 ); 14.72 (CH2A) ppm. Melting point:
231-233ꢀC (Decompose).
[Cu(κ2-PyDT)2] (8). Green-blue solid. Yield: 78%.
Anal. calc. For C36H40CuN2P2S4: C, 33.74; H, 4.53; N,
7.87; S, 36.02. Found: C, 33.63; H, 4.77; N, 7.98; S, 36.14%.
Molar conductivity in DMF: 5.40 (Ω−1 cm−1 mol−1). IR
(KBr) 2,891 w, 2,828 w, 1,543 s, 1,441 s, 1,034 m, 545 s,
504 w cm−1. Melting point: 312-314ꢀC (decompose)..
[Pd(κ2-PyDT)2] (9). Yellow solid. Yield: 83%. Anal. calc.
For C10H16PdN2S4: C, 30.11; H, 4.04; N, 7.02; S, 32.15.
Found: C, 30.02; H, 4.23; N, 7.17; S, 32.29%. Molar conduc-
tivity in DMF: 4.78 (Ω−1 cm−1 mol−1). IR (KBr) 2,974 w,
2,826 w, 1,523 s, 1,435 s, 989 s, 526 s, 435w cm−1. δ 1H
B
NMR (DMSO-d6): δ 2.02 (m, 8H, 4CH2 ); 3.76 (m, 8H,
4CH2 ) ppm. 13C NMR (DMSO-d6): δ 193.39(CSS); 45.71
A
B
A
(CH2 ); 15.60 (CH2 ) ppm Melting point: 134-136ꢀC.
[Pt(κ2-PyDT)2] (10) Orange-yellow. Yield: 77%. Anal.
calc. For C10H16PtN2S4: C, 24.63; H, 3.31; N, 5.75; S,
26.30. Found: C, 24.83; H, 3.49; N, 5.92; S, 26.19%. Molar
conductivity in DMF: 6.76 (Ω−1 cm−1 mol−1). IR (KBr)
Inhibition rate ðIRÞ% = ðA−BnAÞ × 100,
ð2Þ
2,948 w, 2,877 m, 1,496 s, 1,456 s, 1,012 m, 462 s cm−1
.
1H NMR (DMSO-d6): δ 2.00 (m, 8H, 4CH2 ); 3.75 (m, 8H,
where A is the control reading and B is the treatment
reading for each concentration.
B
4CH2A) ppm. 13C NMR (DMSO-d6): δ 194.59 (CSS); 44.54
B
A
(CH2 ); 14.59 (CH2 ) ppm Melting point: 168–170ꢀC
(Decompose) .
3.5 | Molecular docking studies
3.3 | Antibacterial studies
Docking study was applied to identify the possible bind-
ing interactions between the active candidates and SARS
COV2 RNA-dependent RNA polymerase-targeted site.
Docking study will provide some insights into the addi-
tional structural alterations and development of new
more potent and selective SARS COV2 RNA-dependent
RNA polymerase inhibitors. In the present research, a
molecular modeling study which relied on SARS COV2
RNA-dependent RNA polymerase crystal structure (PDB
code 7BV2) was executed applying “molecular operating
environment (MOE) version 2019.01” Chemical Comput-
ing Group Inc. software.[34] At first, water molecules have
been removed from the complex. Then, crystallographic
disorders and unfilled valence atoms were corrected
using protein report and utility and clean protein options.
Protein energy was minimized by applying MMFF94
force fields. The rigid of binding Site was structure of
The antibacterial activity of the Pd(II) and Pt(II)-
dithiocarbamate complexes was examined against six path-
ogenic bacteria, Staphylococcus aureus, Bacillus subtilis,
Pseudomonas aeruginosa, Escherichia coli, Salmonella typ-
himurium, and Vibrio Parahemolyticus. in DMSO as a sol-
vent at 1 × 10−3 M concentration. The activity of the
Pd(II) and Pt(II) complexes was tested by agar disc diffusion
method designated by Molder et al.[33] and the results were
compared with Tetracycline as standard antibiotic.
3.4 | Cytotoxicity studies
The cytotoxicity of Pd(II) and Pt(II)complexes was
screened against MCF7 breast cancer cell line by adding