Page 1 of 12

European Journal of Business &

Social Sciences

Available at https://ejbss.org/

ISSN: 2235-767X

Volume 07 Issue 01

January 2019

Available online: https://ejbss.org/ P a g e | 62

Structural Characterization of Polymeric HG (II)

and Dimeric Oxo-Bridged MN (II) Complexes

SATPAL SINGH

PGT CHEMISTRY

GSSS RAMSARA

FATEHABAD HARYANA

125053

ABSTRACT

Metal complexes of sulfur-nitrogen ligands derived from S-alkyl esters of dithiocarbazic

acid have been studied over the past few decades, not only because of their intriguing

coordination chemistry, but also because of their pronounced biological activities against

microbes, viruses, cancer cells, fungi and bacteria. The cyclization of 3-

acyldithiocarbazic acid esters, N-aroyldithiocarbazates and their salts to 1,3,4-

oxadiazole/thiadiazole-2-thiones in the presence of a acid/base or during complexation is

reported in the literature.

Several other methods are also available for the synthesis of oxadiazoles from acyclic

precursor which include oxidative cyclization of acylhydrazones, acylthiourea and

acylthiosemicarbazides. The cyclization of N2

-[bis(benzyl-sulfanyl)methylene]-2-

methoxybenzohydrazide to 2-benzylsulfanyl-5-(2-methoxyphenyl)-1,3,4-oxadiazole has

been carried out under normal condition without the use of any other reagents viz. base or

acid as already described in the case of other oxadiazoles.

Platinum assisted cyclization of S-methyl 3-acyl-2-methyldithiocarbazates under mild

conditions was reported by Bergamini and co-workers. A few papers are available on the

Page 2 of 12

European Journal of Business &

Social Sciences

Available at https://ejbss.org/

ISSN: 2235-767X

Volume 07 Issue 01

January 2019

Available online: https://ejbss.org/ P a g e | 63

syntheses and X-ray studies of bis(benzylsulfanyl)methylene-2-acidhydrazide and

(benzylsulfanyl)-1,3,4-oxadiazole.

KEYWORDS:

Oxadiazole, Ester, Preparation

INTRODUCTION

A methanol suspension (15 mL) of HgCl2 (0.281 g, 10 mmol) was stirred with a

methanol solution of H2mbhe (0.250 g, 10 mmol). The precipitate obtained was

dissolved in methanol (15 mL), the resulting clear yellow solution was filtered off and

kept for crystallization where upon the single crystals of 1 suitable for X-ray analyses

were obtained by slow evaporation of the solution over a period of 25 days. The possible

pathway for the formation of new ligand (tot) and complex 1 is depicted in Scheme 1.

Yield: 55%, M.p. 190°C.

Fig.1 Ortep diagram of H2mbhe with 30% probability level.

ortep

Page 3 of 12

European Journal of Business &

Social Sciences

Available at https://ejbss.org/

ISSN: 2235-767X

Volume 07 Issue 01

January 2019

Available online: https://ejbss.org/ P a g e | 64

CH3

N

O

NH S

S

CH3

H

CH3

N

NH

O

S

S

CH3

CH3

N

N

O

S

H

CH3

N

N

O S

CH3

N

O

NH

S

S

CH3

H

HgCl2

MeOH

CH3

N

N

O S

Hg

S

S

CH3

Hg

H3C

SCH3

- HCl

Hg

S

CH3

S

n

H3C

N N

S O

S

H3C

S

tot

Scheme 1 Possible pathway for the formation of Hg3(tot)2(μ-SCH3)4]n from

H2mbhe

Synthesis of [Mn2(Hmbhe)2(μmbmst)2]CHCl3

A methanol solution (15 mL) of Mn(OAc)2·4H2O (0.125 g, 1 mmol) was stirred with a

methanol solution (15 mL) of H2mbhe (0.250 g, 2 mmol) and refluxed for 1 h at 80 oC.

The precipitate obtained was further stirred with H2mbhe (0.250 g, 2 mmol). The

resulting clear solution was filtered off, where upon the single crystals of 2 suitable for

X-ray analyses were obtained by slow evaporation of the solution over a period of 10

days. The 2-methyl benzoic acid (5,5′-bis-methylsufanyl-[2,3′]bi[[1,3,4]thiadiazolyl]-2'-

ylidene)-hydrazide (mbmst) generated during the reaction could not be isolated and