Page 1 of 11

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 | 155

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

Page 2 of 11

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 | 156

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.

Page 3 of 11

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 | 157

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