Cadmium( ii ) complexes with a 4-acyl pyrazolone derivative and co-ligands: crystal structures and antitumor activity
Three cadmium( ii ) complexes, [Cd(HL) 2 (CH 3 OH) 2 ]·(CH 3 OH) ( 1 ), [Cd(HL) 2 (bpy)]·(CH 3 OH) 2 ( 2 ), and [Cd(HL) 2 (phen)]·(CH 3 OH) 1.5 ( 3 ), (where H2L = N -(1-phenyl-3-methyl-4-(4-chlorobenzoyl)-5-pyrazolone)-2-thiophenecarboxylic acid hydrazide, bpy = 2,2′-bipyridine, phen = 1,10-phenant...
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Published in | RSC advances Vol. 6; no. 116; pp. 114997 - 115009 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
2016
|
Online Access | Get full text |
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Summary: | Three cadmium(
ii
) complexes, [Cd(HL)
2
(CH
3
OH)
2
]·(CH
3
OH) (
1
), [Cd(HL)
2
(bpy)]·(CH
3
OH)
2
(
2
), and [Cd(HL)
2
(phen)]·(CH
3
OH)
1.5
(
3
), (where
H2L
=
N
-(1-phenyl-3-methyl-4-(4-chlorobenzoyl)-5-pyrazolone)-2-thiophenecarboxylic acid hydrazide, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline) have been synthesized and characterized. Single crystal X-ray diffraction analyses indicated that complexes
1–3
exhibit mononuclear octahedral geometry. The spectrophotometric analyses showed that these complexes could bind with herring sperm DNA and bovine serum albumin (BSA). The intrinsic binding constants to HS-DNA were 2.46 × 10
4
M
−1
, 2.64 × 10
4
M
−1
, and 4.41 × 10
4
M
−1
, and the quenching constants to BSA were 1.23 × 10
6
M
−1
, 1.85 × 10
6
M
−1
, and 2.17 × 10
6
M
−1
for the complexes
1–3
, respectively. The complexes have higher cytotoxic activities against HeLa and Eca-109 tumor cells than that of the ligand and cisplatin. Complex
3
shows the highest cytotoxicity for both HeLa and Eca-109, and the IC
50
values are 3.35 ± 0.2 μg mL
−1
and 7.41 ± 0.07 μg mL
−1
, respectively. When compared with our previous work, IC
50
value of the reported complex CdC
20
H
18
N
4
O
3
to Eca-109 cells is 14.18 μg mL
−1
. We further found that complex
3
inhibits the growth of HeLa cells by inducing apoptosis and arresting the cell cycle during the G0/G1 phase. These results suggest that complex
3
is a potential antitumor drug. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C6RA23938B |