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European Journal of Business &
Social Sciences
Available at https://ejbss.org/
ISSN: 2235-767X
Volume 07 Issue 02
February 2019
Available online: https://ejbss.org/ P a g e | 210
A Study on Dithiocarbamates and Their
Transition Metal Complexes
SATPAL SINGH
PGT CHEMISTRY
GSSS RAMSARA
FATEHABAD HARYANA
125053
ABSTRACT
Dithiocarbamates represent an interesting class of dithio ligand. With
regard to structural studies, dithiocarbamate ligands often display
unsymmetrical bidentate coordination patterns. Besides this, the ability of
dithiocarbamate ligands to bind to metals has been known for many
years, forming chelates with virtually all transition elements.
Dithiocarbamates and related ligands as well as transition-metal
complexes in which a 1,1-dithio ligand forms a four-membered ring with
the metal ion have been extensively investigated and thoroughly reviewed.
Most aliphatic and aromatic dithiocarbamate complexes synthesized till
now have only the dithio group as a ligand, so that they exhibit only
uninegative bidentate possibility. The current paper highlights the
Dithiocarbamates and their transition metal complexes.
KEYWORDS:
Dithiocarbamates, Transition, Metal, Complex
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European Journal of Business &
Social Sciences
Available at https://ejbss.org/
ISSN: 2235-767X
Volume 07 Issue 02
February 2019
Available online: https://ejbss.org/ P a g e | 211
INTRODUCTION
Disproportionation of [Cu{S2CN(CH2CH2OMe)2}2] upon addition of
Cu(ClO4)2·6H2O affords [Cu{S2CN (CH2CH2OMe)2}2][ClO4] copper(III)
complex and there are no intermolecular cation-cation or cation-anion
interactions.
On the other hand, dithiocarbamates with up to three ligating residues
have rarely been reported in the literature. These materials are used in a
wide number of diverse applications which include their role as additives
to pavement asphalt, in analytical determinations and as potent
biological pesticides and pharmaceuticals. Some dialkyl-substituted
dithiocarbamate salts have also shown interesting biological effects
which include anti-alkylation or anti-HIV properties.
Further, they have also prepared amine-functionalized dithiocarbamate
salts K[S2CN(CH2CH2NEt2)2] and K[S2CN(CH2CH2NMe2)2] and used them
for the synthesis of a number of bis and tris-dithiocarbamate complexes.
The molecular structures of five of these namely,
[M{S2CN(CH2CH2NEt2)2}2], [M{S2CN(CH2CH2 NMe2)2}2] (M = Ni, Cu, Pd) and
[Co{S2CN(CH2CH2CH2N Me2)2}3] (Fig.1), have been elucidated by X-ray
crystallography.
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European Journal of Business &
Social Sciences
Available at https://ejbss.org/
ISSN: 2235-767X
Volume 07 Issue 02
February 2019
Available online: https://ejbss.org/ P a g e | 212
Fig.1. Molecular structure of [Co{S2CN(CH2CH2CH2NMe2)2}3]
Characterization of the prepared complexes showed the presence of only
one band around 1000 cm-1 in IR spectra, attributed to a completely
symmetrical bonding of the dithiocarbamate ligand, acting in a
symmetrical bidentate mode. Also the short thioureide C-N distance in X- ray analysis of Ni complex confirms the delocalization of the π electrons
over the S2CN moiety and strong double bond character.
Single crystals of Zn2(Et2dtc)4 containing approximately 2% of Cu2+ in the
host lattice showed the doublet spectral characteristic of the Cu2+ ions (S
= 1/2, I = 3/2). Bis(N,N-diethyldithiocarbamato)Zn(II) and bis(N,N
diethyldithiocarbamate)Cd(II) have identical dimeric structure.
In molecular structure of 1, the cadmium atom coordinates with four
sulphur atoms and one nitrogen atom of pyridine, forming a coordination
polyhedron [CdS4N], with an almost ideal tetragonal pyramidal (C4v)
geometry. The coordinated pyridine molecule is in the apical position,
Image