Synthesis and characterization of Cu(II), Ni(II) and Zn(II) metal complexes of bidentate NS isomeric Schiff bases derived from S-methyldithiocarbazate (SMDTC)

Bioactivity of the bidentate NS isomeric Schiff bases, some of their Cu(II), Ni(II) and Zn(II) complexes and the x-ray structure of the bis[S-methyl-β-N-(2-furyl-methyl)methylenedithiocarbazato]zinc(II) complex

M. T H Tarafder, Kar Beng Chew, Karen A. Crouse, A. M. Ali, Bohari Mohd. Yamin, H. K. Fun

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Abstract

Two new isomeric Schiff bases, S-methyl-β-N-(2-furylmethyl)methylenedithiocarbazate (NS′) and S-methyl-β-N-(5-methyl-2-furyl)methylenedithiocarbazate (NS″) have been prepared. Bis-chelated complexes of these two bidentate ligands, [M(NS)2], [M = Cu(II), Ni(II) and Zn(II)], were synthesized. The Schiff bases and their metal complexes have been characterized by a variety of physico-chemical techniques. X-ray crystallographic analysis shows that the Zn(II) complex, [Zn(NS′)2], is four-coordinate and has a distorted tetrahedral structure with the ligand coordinated to the Zn(II) ion as an uninegatively charged bidentate chelating agent via the azomethine nitrogen and the mercaptide sulfur atoms. The Cu(II) complexes are paramagnetic with a square-planar stereochemistry. The Ni(II) and [Zn(NS″)2] complexes have a square-planar and tetrahedral structure, respectively, however, they are diamagnetic. Only Cu(NS′)2 showed clear activity against the bacteria, Subtilis mutant (B28), while both NS′ and NS″ Schiff bases were strongly antifungal against Saccharomyces cereviceae (20341), Candida albicans, Candida lypolytica (2075) and Aspergillus ochraceous (398). Cu(NS′)2 and Ni(NS′)2 showed clear inhibition of C. albicans and S. cereviceae (20341), respectively. The Cu(NS′)2, Ni(NS′)2 and Zn(NS′)2 complexes showed very good activity against human cell T-lymphoblastic leukemia [CEM-SS] cells with CD50 values of 1.6, 2.1 and 3.0 μg ml-1, respectively. The remainder of the Schiff bases and complexes were inactive towards CEM-SS cells. None of the compounds showed any activity towards colon cancer cells (HT-29). Only the Cu(NS′)2 and Zn(NS′)2 complexes were highly active against cervical cancer cells (HELA cells) with CD50 values of 1.5 and 2.1 μg ml-1, while the Ni(NS′)2 complex was weakly active towards HELA cells with a CD50 value of 23.0 μg ml-1.

Original languageEnglish
Pages (from-to)2683-2690
Number of pages8
JournalPolyhedron
Volume21
Issue number27-28
Publication statusPublished - 15 Dec 2002

Fingerprint

Schiff Bases
Coordination Complexes
Metal complexes
Bioactivity
imines
Zinc
Candida
zinc
Cells
X-Rays
X rays
synthesis
cells
Ligands
metals
Stereochemistry
x rays
Aspergillus
cancer
Chelation

Keywords

  • Crystal structures of Zn(II) complexes
  • Cu(II)
  • Ni(II)
  • NS Schiff base
  • S-methyldithiocarbazate (SMDTC)
  • Zn(II) complexes

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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title = "Synthesis and characterization of Cu(II), Ni(II) and Zn(II) metal complexes of bidentate NS isomeric Schiff bases derived from S-methyldithiocarbazate (SMDTC): Bioactivity of the bidentate NS isomeric Schiff bases, some of their Cu(II), Ni(II) and Zn(II) complexes and the x-ray structure of the bis[S-methyl-β-N-(2-furyl-methyl)methylenedithiocarbazato]zinc(II) complex",
abstract = "Two new isomeric Schiff bases, S-methyl-β-N-(2-furylmethyl)methylenedithiocarbazate (NS′) and S-methyl-β-N-(5-methyl-2-furyl)methylenedithiocarbazate (NS″) have been prepared. Bis-chelated complexes of these two bidentate ligands, [M(NS)2], [M = Cu(II), Ni(II) and Zn(II)], were synthesized. The Schiff bases and their metal complexes have been characterized by a variety of physico-chemical techniques. X-ray crystallographic analysis shows that the Zn(II) complex, [Zn(NS′)2], is four-coordinate and has a distorted tetrahedral structure with the ligand coordinated to the Zn(II) ion as an uninegatively charged bidentate chelating agent via the azomethine nitrogen and the mercaptide sulfur atoms. The Cu(II) complexes are paramagnetic with a square-planar stereochemistry. The Ni(II) and [Zn(NS″)2] complexes have a square-planar and tetrahedral structure, respectively, however, they are diamagnetic. Only Cu(NS′)2 showed clear activity against the bacteria, Subtilis mutant (B28), while both NS′ and NS″ Schiff bases were strongly antifungal against Saccharomyces cereviceae (20341), Candida albicans, Candida lypolytica (2075) and Aspergillus ochraceous (398). Cu(NS′)2 and Ni(NS′)2 showed clear inhibition of C. albicans and S. cereviceae (20341), respectively. The Cu(NS′)2, Ni(NS′)2 and Zn(NS′)2 complexes showed very good activity against human cell T-lymphoblastic leukemia [CEM-SS] cells with CD50 values of 1.6, 2.1 and 3.0 μg ml-1, respectively. The remainder of the Schiff bases and complexes were inactive towards CEM-SS cells. None of the compounds showed any activity towards colon cancer cells (HT-29). Only the Cu(NS′)2 and Zn(NS′)2 complexes were highly active against cervical cancer cells (HELA cells) with CD50 values of 1.5 and 2.1 μg ml-1, while the Ni(NS′)2 complex was weakly active towards HELA cells with a CD50 value of 23.0 μg ml-1.",
keywords = "Crystal structures of Zn(II) complexes, Cu(II), Ni(II), NS Schiff base, S-methyldithiocarbazate (SMDTC), Zn(II) complexes",
author = "Tarafder, {M. T H} and Chew, {Kar Beng} and Crouse, {Karen A.} and Ali, {A. M.} and {Mohd. Yamin}, Bohari and Fun, {H. K.}",
year = "2002",
month = "12",
day = "15",
language = "English",
volume = "21",
pages = "2683--2690",
journal = "Polyhedron",
issn = "0277-5387",
publisher = "Elsevier Limited",
number = "27-28",

}

TY - JOUR

T1 - Synthesis and characterization of Cu(II), Ni(II) and Zn(II) metal complexes of bidentate NS isomeric Schiff bases derived from S-methyldithiocarbazate (SMDTC)

T2 - Bioactivity of the bidentate NS isomeric Schiff bases, some of their Cu(II), Ni(II) and Zn(II) complexes and the x-ray structure of the bis[S-methyl-β-N-(2-furyl-methyl)methylenedithiocarbazato]zinc(II) complex

AU - Tarafder, M. T H

AU - Chew, Kar Beng

AU - Crouse, Karen A.

AU - Ali, A. M.

AU - Mohd. Yamin, Bohari

AU - Fun, H. K.

PY - 2002/12/15

Y1 - 2002/12/15

N2 - Two new isomeric Schiff bases, S-methyl-β-N-(2-furylmethyl)methylenedithiocarbazate (NS′) and S-methyl-β-N-(5-methyl-2-furyl)methylenedithiocarbazate (NS″) have been prepared. Bis-chelated complexes of these two bidentate ligands, [M(NS)2], [M = Cu(II), Ni(II) and Zn(II)], were synthesized. The Schiff bases and their metal complexes have been characterized by a variety of physico-chemical techniques. X-ray crystallographic analysis shows that the Zn(II) complex, [Zn(NS′)2], is four-coordinate and has a distorted tetrahedral structure with the ligand coordinated to the Zn(II) ion as an uninegatively charged bidentate chelating agent via the azomethine nitrogen and the mercaptide sulfur atoms. The Cu(II) complexes are paramagnetic with a square-planar stereochemistry. The Ni(II) and [Zn(NS″)2] complexes have a square-planar and tetrahedral structure, respectively, however, they are diamagnetic. Only Cu(NS′)2 showed clear activity against the bacteria, Subtilis mutant (B28), while both NS′ and NS″ Schiff bases were strongly antifungal against Saccharomyces cereviceae (20341), Candida albicans, Candida lypolytica (2075) and Aspergillus ochraceous (398). Cu(NS′)2 and Ni(NS′)2 showed clear inhibition of C. albicans and S. cereviceae (20341), respectively. The Cu(NS′)2, Ni(NS′)2 and Zn(NS′)2 complexes showed very good activity against human cell T-lymphoblastic leukemia [CEM-SS] cells with CD50 values of 1.6, 2.1 and 3.0 μg ml-1, respectively. The remainder of the Schiff bases and complexes were inactive towards CEM-SS cells. None of the compounds showed any activity towards colon cancer cells (HT-29). Only the Cu(NS′)2 and Zn(NS′)2 complexes were highly active against cervical cancer cells (HELA cells) with CD50 values of 1.5 and 2.1 μg ml-1, while the Ni(NS′)2 complex was weakly active towards HELA cells with a CD50 value of 23.0 μg ml-1.

AB - Two new isomeric Schiff bases, S-methyl-β-N-(2-furylmethyl)methylenedithiocarbazate (NS′) and S-methyl-β-N-(5-methyl-2-furyl)methylenedithiocarbazate (NS″) have been prepared. Bis-chelated complexes of these two bidentate ligands, [M(NS)2], [M = Cu(II), Ni(II) and Zn(II)], were synthesized. The Schiff bases and their metal complexes have been characterized by a variety of physico-chemical techniques. X-ray crystallographic analysis shows that the Zn(II) complex, [Zn(NS′)2], is four-coordinate and has a distorted tetrahedral structure with the ligand coordinated to the Zn(II) ion as an uninegatively charged bidentate chelating agent via the azomethine nitrogen and the mercaptide sulfur atoms. The Cu(II) complexes are paramagnetic with a square-planar stereochemistry. The Ni(II) and [Zn(NS″)2] complexes have a square-planar and tetrahedral structure, respectively, however, they are diamagnetic. Only Cu(NS′)2 showed clear activity against the bacteria, Subtilis mutant (B28), while both NS′ and NS″ Schiff bases were strongly antifungal against Saccharomyces cereviceae (20341), Candida albicans, Candida lypolytica (2075) and Aspergillus ochraceous (398). Cu(NS′)2 and Ni(NS′)2 showed clear inhibition of C. albicans and S. cereviceae (20341), respectively. The Cu(NS′)2, Ni(NS′)2 and Zn(NS′)2 complexes showed very good activity against human cell T-lymphoblastic leukemia [CEM-SS] cells with CD50 values of 1.6, 2.1 and 3.0 μg ml-1, respectively. The remainder of the Schiff bases and complexes were inactive towards CEM-SS cells. None of the compounds showed any activity towards colon cancer cells (HT-29). Only the Cu(NS′)2 and Zn(NS′)2 complexes were highly active against cervical cancer cells (HELA cells) with CD50 values of 1.5 and 2.1 μg ml-1, while the Ni(NS′)2 complex was weakly active towards HELA cells with a CD50 value of 23.0 μg ml-1.

KW - Crystal structures of Zn(II) complexes

KW - Cu(II)

KW - Ni(II)

KW - NS Schiff base

KW - S-methyldithiocarbazate (SMDTC)

KW - Zn(II) complexes

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M3 - Article

VL - 21

SP - 2683

EP - 2690

JO - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 27-28

ER -