Synthesis and characterization of the adducts of bis(O-butylxanthato)Ni(II) with nitrogen donor ligands and X-ray structure of bis(O-butylxanthato)bis(3-chloropyridine)nickel(II)

Article abstract of DOI:10.1016/j.molstruc.2016.09.050

A new series of adducts of bis(O-butylxanthato)nickel(II) with substituted pyridines have been synthesized by treating bis(O-butylxanthato)nickel(II) with substituted pyridines in acetone. The complexes have been characterized by elemental analysis, conductivity measurements, magnetic susceptibility measurements, TGA/DTA studies, infrared and electronic spectral studies. X-ray studies of one of the adduct bis(O-butylxanthato)bis(3-chloropyridine)nickel(II) shows that the central metal is octahedrally coordinated within a trans-N₂S₄ donor set, with the Ni atom located on a centre of inversion. The complex crystallizes in the monoclinic space group P2₁/c with unit cell parameters a?=?11.8088(8)??, b?=?12.2042(7)??, c?=?9.0252(5)??, β?=?93.789(6), Z?=?2. Crystal structure was solved by direct methods and refined by full matrix least squares procedures to a final R-value of 0.0380 (wR2?=?0.0885) for 2083 observed reflections. The butyl chain is disordered over two set of sites, with occupancy ratios of 0.741:0.259. These studies suggest a distorted octahedral structure and paramagnetic nature of the adducts.

Full text of DOI:10.1016/j.molstruc.2016.09.050

Journal of Molecular Structure 1128 (2017) 769e774
Contents lists available at ScienceDirect
Journal of Molecular Structure
journal homepage: http://www.elsevier.com/locate/molstruc
Synthesis and characterization of the adducts of bis(O-butylxanthato)
Ni(II) with nitrogen donor ligands and X-ray structure of bis(O-
butylxanthato)bis(3-chloropyridine)nickel(II)
a
b
a
b
b, *
Inderjeet Kour , Gurvinder Kour , Renu Sachar , Sumati Anthal , Rajni Kant
a
Department of Chemistry, University of Jammu, Jammu Tawi, 180 006, India
X-ray Crystallography Laboratory, Post Graduate Department of Physics and Electronics, University of Jammu, Jammu Tawi, 180 006, India
b
a r t i c l e i n f o
a b s t r a c t
Article history:
Received 9 August 2016
Received in revised form
A new series of adducts of bis(O-butylxanthato)nickel(II) with substituted pyridines have been synthe-
sized by treating bis(O-butylxanthato)nickel(II) with substituted pyridines in acetone. The complexes
have been characterized by elemental analysis, conductivity measurements, magnetic susceptibility
measurements, TGA/DTA studies, infrared and electronic spectral studies. X-ray studies of one of the
adduct bis(O-butylxanthato)bis(3-chloropyridine)nickel(II) shows that the central metal is octahedrally
16 September 2016
Accepted 19 September 2016
Available online 20 September 2016
coordinated within a trans-N
complex crystallizes in the monoclinic space group P2
b ¼ 12.2042(7) Å, c ¼ 9.0252(5) Å,
2
S
4
donor set, with the Ni atom located on a centre of inversion. The
/c with unit cell parameters a ¼ 11.8088(8) Å,
¼ 93.789(6), Z ¼ 2. Crystal structure was solved by direct methods
1
Keywords:
Adduct
Octahedrally
Crystal structure
Xanthate
b
and refined by full matrix least squares procedures to a final R-value of 0.0380 (wR2 ¼ 0.0885) for 2083
observed reflections. The butyl chain is disordered over two set of sites, with occupancy ratios of
0.741:0.259. These studies suggest a distorted octahedral structure and paramagnetic nature of the
adducts.
Ligands
©
2016 Elsevier B.V. All rights reserved.
1
. Introduction
backbone of these ligands with a second donor set (for instance
with hard donors such as pyridine-based groups), it is possible to
take advantage of their rich coordination patterns and differences
between the coordination preferences of sulfur atoms for soft
metals and of pyridine-based groups for hard metals to design and
prepare new heterometallic species. Thus in continuation of our
earlier research work on alkylxanthates and their adducts with
nitrogen donor ligands, we herein report the synthesis and char-
acterization of adducts of bis(O-butylxanthato)nickel(II) with
substituted pyridines.
In recent few years there has been considerable upsurge of
knowledge in the study of chemistry of an important class of
bidentate sulfur donating ligands, called xanthates, a name derived
from the Greek word xanthos (yellow), owing to the yellow color of
lead xanthates [1,2]. Xanthates as a ligand are widely investigated
due to their diverse coordination behavior [3,4]. They can form
bidentate, monodentate or network solids, showing a wide range of
coordination behavior [5e7]. Metal xanthates are extensively used
as corrosion inhibitors and agricultural reagents [8e10]. Xanthates
have also found important use in medicine as antitumor agents and
for treating Alzheimer's disease [11e13]. Sodium and potassium
ethylxanthate have antidotal effects in acute mercurial poisoning
and recently as co-adjuvant in AIDS treatment [14,15].
2. Experimental section
2.1. Synthesis of the complex
Interestingly, there are no significant reports of xanthate ligand
functionalized with additional donor groups that would expand
their coordination capabilities but some how, by modifying the
2.1.1. Preparation of potassium salt of O-butylxanthate
The potassium salt of O-butylxanthate was prepared by the
standard published method [16]. Into a 500 ml round bottomed
flask, fitted with a reflux condenser, 4.2 g (0.075 mol) of potassium
hydroxide pellets were placed and 19.271 g (23.472 ml, 0.26 mol) of
n-butanol was added. The reaction mixture was heated under
reflux for 1 h. The contents were then cooled and the liquid from
*
Corresponding author.
E-mail address: rkant.ju@gmail.com (R. Kant).
http://dx.doi.org/10.1016/j.molstruc.2016.09.050
022-2860/© 2016 Elsevier B.V. All rights reserved.
0

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I. Kour et al. / Journal of Molecular Structure 1128 (2017) 769e774
Table 1
Analytical data, molar conductance and magnetic moments of the adducts of bis(O-butyldithiocarbonato)nickel(II) with substituted pyridines.
Magnetic moment m
eff (B.M) Molar conductance (Ohm 1 mol cm2)
ꢀ
ꢀ1
S. No Name of the adduct
%Found(calculate)
C
H
N
S
1
2
3
4
5
Bis(O-butylxanthato) (2-ethylpyridine)nickel(II)
48.95
5.88
4.35
22.05
2.93
3.48
3.19
3.02
3.23
50.25
40.72
48.39
39.24
42.12
(50.28) (6.28) (4.88) (22.35)
Bis(O-butylxanthato) (3-ethylpyridine)nickel(II)
Bis(O-butylxanthato) (4-ethylpyridine)nickel(II)
49.01
5.93
4.05
22.0
(50.28) (6.28) (4.18) (21.85)
48.82
6.01
4.43
21.95
(50.28) (6.28) (4.63) (22.47)
Bis(O-butylxanthato) (2-chloropyridine)nickel(II) 39.53
4.2
4.48
20.93
(
41.04) (4.4)
Bis(O-butylxanthato) (3-chloropyridine)nickel(II) 39.98 4.01
41.04) (4.4)
(4.54) (21.89)
4.23 20.98
(4.58) (21.44)
(
Table 2
Infrared and UVeVisible Spectra of (O-butyldithiocarbonato)nickel(II) with substituted pyridines.
IR spectral data(cmꢀ1)
as(CeOeC) (CeOeS)
UVevisible (cm
3A g / 3
ꢀ1
)
Name of the adduct
3 2 1
y T g(P)
3A g(F/) 3
y
y
y(CeS)
y
1
2
T
2
g(F)
y
2
3A
2
g(F) / 3
1
T g(F)
s
Bis(O-butyldithiocarbonato)
bis(2-ethylpyridine)nickel(II)
Bis(O-butyldithiocarbonato)
bis(3-ethylpyridine)nickel(II)
Bis (O-butyldithiocarbonato)
bis(4-ethylpyridine)nickel(II)
Bis(O-butyldithiocarbonato)
bis(2-chloropyridine)nickel(II)
Bis(O-butyldithiocarbonato)
bis(3-chloropyridine)nickel(II)
1202
1199
1199
1200
1210
1123
1134
1140
1137
1135
1033
1035
1037
1037
1034
12478
12598
13668
13950
13780
19200
18224
19990
18890
18800
23800
25300
24520
26400
25840
RC SAIF PU, Chandigarh
Spectrum Name: Shivangi Sharma-4.sp
Description: CUX
Date Created: fri may 17 12:20:14 2013 India Standard Time (GMT+5:30)
Fig. 1. IR spectra of bis(O-butylxanthato)bis(4-ethylpyridine).
the reaction mixture was decanted off into another dry 500 ml
flask. To this flask, 5.7 g (4.5 ml, 0.075 mol) of carbon disulphide
was added slowly with constant heating.
The contents of the flask were filtered (after cooling in ice) on a
sintered glass funnel at the pump and washed with three 25 ml
portions of ether. The resulting product potassium O-butylxanthate
was dried in a vacuum desiccator over anhydrous calcium chloride.
2.1.2. Preparation of Bis(O-butyldithiocarbonato)nickel(II)
The saturated aqueous solutions of NiCl $6H O(2.37 g, 0.01 mol)
and potassium O-butyldithiocarbonate (3.7 g, 0.02 mol) were pre-
pared separately and then mixed with constant stirring. Dark
green precipitates were formed which were filtered immediately
2
2
and were dried in
a vacuum desiccator over anhydrous
calcium chloride. The composition of the complex was established
to be [Ni(S
2
4 9 2
COC H ) ] by the elemental analysis.
S-
+
Reflux
ꢀ1
S
S
S
ROH þ CS þ MOHƒƒ!ROCSS þH O
(
aq)
C
4
H
9
CO
C
(aq)NiCl
2
.2H
2
O
C
4
H
9
CO
C
Ni
4
CH OCC H9
.
2
2
S
S
þ
where, R ¼ eC
4
H
9
and M ¼ Na or K.

I. Kour et al. / Journal of Molecular Structure 1128 (2017) 769e774
771
Table 3
Thermal degradation of some adducts of bis(O-alkylxanthato)nickel(II) with substituted pyridine.
ꢂ
S.No Addition complex
Sample mass (mg) Residual mass (mg) Mass loss%
Dec.temp.( C) Residue compd. Residual%
ꢂ
~800
C
ꢂ
ꢂ
1
00-200 C obs.(calc.) 200-500 C obs.(calc.)
Found Calc.
ꢂ
ꢂ
1
.
.
Ni(S
Ni(S
2
COC
COC
4
H
H
9
)
)
2
(C
(C
7
H
H
9
N)
2
8.5 g
10 g
2.45
3.51
59.6
60.1)
58.9
60.5)
73.8
(75.0)
76.5
810
800
C
C
NiS
NiS
92.8
91.9
92.5
92.0
(
2
2
4
9
2
5
4
N$Cl)
2
(
(74.5)
2
.1.3. 2.1.3Preparation of adducts of Bis(O-butyldithiocarbonato)
millimolar solution in dimethylformamide by using Digital con-
ductivity meter “Century CC 601”. Magnetic measurements were
carried out at room temperature by Gouy's method. The infrared
nickel(II)with substituted pyridines.
The 1:2 adducts of bis(dithiocarbonato)nickel(II)with
substituted pyridines were prepared by stirring bis(O-butyldithio-
carbonato)nickel(II) (0.0026 mol) in about 70 ml of acetone for
about 20 min followed by the addition of substituted pyridines [2-
ꢀ
1
spectra of the complexes over the region 4000e400 cm have
been recorded using KBr pellets on Perkin Elemer FT-IR Spectro-
photometer. The electronic spectra of the adducts were recorded in
1
1
,
2
3-,4-ethylpyridine and 2-, 3- chloropyridines] (0.0052 mol) for
0 min. The contents of the reaction mixture were then filtered and
dimethylformamide in the range 12500 cmꢀ to 40000 cmꢀ on
Systronics 119UVeVisible spectrophotometer. The analytical data,
molar conductance and magnetic moments of the adducts isolated
are presented in Table 1. Important IR bands and Electronic spectral
data are cited in Table 2.
allowed to stand for 20e24 h, depositing shining green crystalline
solids which were then washed with the solvent used in their
preparation and dried over calcium chloride at room temperature.
The adducts thus obtained were recrystallised from acetone.
2.3. X-ray data collection and structure refinement
A green block-shaped single crystal of the title compound,
measuring 0.30 ꢁ 0.20 ꢁ 0.10 mm, was picked up for X-ray intensity
data collection. X-ray intensity data were collected by using an
X'calibur Oxford Diffraction system with graphite monochromatic
Mo K
a
radiation (
l
¼ 0.71073 Å), and reduced with CrysAlis RED [17].
The cell dimensions were determined by the least-squares fit of
angular settings of 1915 reflections in the
ꢂ ꢂ
q range 3.76 e29.05 . A
total number of 4674 reflections were collected of which 2541 re-
flections were unique and 2083 reflections were treated as observed
(I > 2s(I)). Data were corrected for Lorentz, polarization and ab-
sorption factors. The structure was solved by direct methods using
SHELXS97 and refined by SHELXL97 [18]. The geometry of the
molecule is determined by PLATON [19] and PARST [20] software. All
H atoms were geometrically fixed and allowed to ride on their parent
C atoms, with CeH distances of 0.93e0.97 Å and with 1.5Ueq(methyl
C) and Uiso(H) ¼ 1.2Ueq(C) for other hydrogen atoms. The final
.
where X ¼ 2-,3-,4-ethyl, 2-,3-chloropyridine.
2
.2. Method
Molar conductance of the adducts was determined on their
2
refinement cycle yielded an R-factor of 0.0380 [wR (F ) ¼ 0.0885] for
the observed data. The crystallographic data are summarized in
Table 5. An ORTEP view of the metal complex is shown in Fig. 4.
Fig. 2. TGA of bis(O-butylxanthato)bis(4-ethylpyridine)Ni(II).
Fig. 3. TGA of bis(O-butylxanthato)bis(3-chloropyridine)Ni(II).

772
I. Kour et al. / Journal of Molecular Structure 1128 (2017) 769e774
Table 4
Antifungal activities of some adducts of bis(O-butyldithiocarbonato)nickel(II) with nitrogen donor ligands against Rhizopus nigricans.
S$No
Adittion complex
Colony diameter (mm)
80
Concentration
50
Colony diameter(mm)
%Inhibition I ¼ [(CT)/C] ꢁ 100
1
Ni(S
2
COC
4
H
9
)
2
(C
7
H
H
9
N)
2
72.8
55.5
30.0
12.6
78.0
62.7
40.1
20.3
9.0
1
1
2
00
50
00
30.6
62.5
84.25
2.5
21.6
49.87
74.62
2
Ni(S
2
COC
4
H
9
)
2
(C
5
4
N$Cl)
2
80
50
1
1
2
00
50
00
3
. Results and discussion
.1. Preliminary investigations
The adducts of Bis(O-butylxanthato)nickel(II) with substituted
of free ligands are shifted in their respective complexes. The newly
prepared adducts show two bands varying in the range of
ꢀ
1
ꢀ1
3
1240e1270 cm and1128e1144 cm which are assigned to
CeOeC) and (CeOeC) stretching vibrations. The appearance of a
single band for (CeS) vibration and its position indicate symmet-
nas(-
n
s
y
pyridines are green coloured crystalline solids soluble in common
organic solvents. The molar conductivity values calculated (in the
range of 34.4e53.08 ohm mol cm ) from the conductivities
measured on millimolar solutions of the adducts in DMF, support the
neutral and non-ionic nature of complexes [21,22]. The magnetic
moment values of the adducts prepared vary in the range of
rical bidentate binding of xanthate moiety. The co-ordination of
metal atom with nitrogen donor ligand is supported by characteristic
red shift observed for the CeH out of plane deformation band at
ꢀ
1
ꢀ1
2
ꢀ1
908 cm (Fig. 1).
3.2. Thermal studies
2
.98e3.01 BMBM which is in agreement with magnetic moment
values observed for octahedral complexes of nickel(II) [23,24]. The
assignment of octahedral geometries is also supported by the elec-
tronic absorption spectra where absorption maxima of d-d transition
TGA/DTA studies of the complexes were recorded in the tem-
ꢂ
ꢂ
perature range 30e1000 C at a heating rate of 10 C/min in ni-
trogen atmosphere. The results of thermal analysis of two
representing adducts bis(O-butylxanthato)bis(4-ethylpyridine)
Ni(II) and bis(O-butylxanthato)bis(3-chloro-pyridine)Ni(II) are
summarized in Table 3 (Fig. 2 and Fig. 3). The TG curves show
stepwise decomposition processes for these complexes resulting in
the formation of NiS as a stable end product as indicated by the
following general equations:
1
2
3
ꢀ1
shows three bands
n , n , n respectively at 14000-16000 cm
3
2g(F) / 3
ꢀ1
3
3
[
A
T
2g(F)], 19200e21000 cm [ A2g(F) /
T1g(F)] and
ꢀ1
3
3
2
5000e28000 cm [ A2g(F) / T2g(P)] [25,26]. A comparison of the
infrared spectra of the newly prepared adducts with those of the
corresponding free ligands reveals that most of the absorption bands
Table 5
TGA of bis(O-butylxanthato) (4-ethylpyridine)nickel(II)
Crystal and experimental data.
Â
Ã
ꢂ
1
00e200 C
CCDC No
980793
NiðS COC H Þ ð4ꢀethylpyidineÞ ƒƒƒƒ!
2
4
9 2
2
ꢀ2molecules of 4ꢀethylpyridine
Crystal description
Empirical formula
Formula weight
Melting point
Block shaped, Green
C
20
H
26
C
l2
N
2
Ni O
2
S
4
Â
Ã
ꢂ
ꢂ
2
00e500 C
810 C
584.28
NiðS COC H Þ ƒƒƒƒ! NiSO ƒƒ ! NiS
2
4
9 2
4
ꢂ
95
C
TGA of bis(O-butylxanthato)bis(3-chloropyridine)nickel(II)
Measurement
Radiation, wavelength
Unit cell dimensions
X'Calibur System
MoK , 0.71073 Å
a ¼ 11.8088(8)Å, b ¼ 12.2042(7)Å, c ¼ 9.0252(5)Å,
¼ 93.789(6ꢀ)
Monoclinic
P2 /c
a
Â
Ã
ꢂ
1
00e200 C
NiðS COC H Þ ð4ꢀchloropyidineÞ ƒƒƒƒ!
2
4
9 2
2
ꢀ2molecules of 4ꢀchloropyidine
b
Crystal system
Space group
Unit cell volume
Density (calculated)
Temperature
Â
Ã
ꢂ
ꢂ
2
00e500 C
810 C
1
NiðS COC H Þ ƒƒƒƒ! NiSO ƒƒ ! NiS
2
4
9 2
4
3
1297.84(14) Å
3
1.370 g/cm
293(2) K
1.295 mm
604
ꢀ
1
Absorption coefficient
F (000)
Table 6
Scan mode
u
3.76
scan
ꢂ
Bond lengths (Å) and bond angles ( ) for non hydrogen atoms (e.s.d's in parenthesis).
ꢂ
ꢂ
q
range for entire data
collection
<
q
< 26.00
Bond lengths (Å)
Range of indices
Reflections collected/
unique
ꢀ10 < h < 14, ꢀ8 < k < 15, ꢀ8 < l < 11
Ni1eN1
Ni1eS1
S1eC1
O1eC1
O1eC2
N1eC10
Bond Angles ( )
N1eNi1eS2
S2eNi1eS1
C1eS1eNi1
C1eO1eC2
C6eN1eNi1
N1eC6eC7
O1eC1eS1
S1eC1eS2
2.115(2)
2.4550(7)
1.680(3)
1.326(3)
1.459(17)
1.335(3)
Ni1 eS2
S2 eC1
Cl1 eC9
O1 eC2
N1e C6
2.4395(7)
1.694(3)
1.730(3)
1.43(4)
4674/2541
0
R
R
int
0.0304
0.0451
sigma
1.328(3)
Structure determination
Refinement
Direct Methods
2
ꢂ
Full Matrix Least Squares on F
2
2
2
Weighing scheme
[I\
P ¼ (Fo þ2Fc )/3
No. of parameters refined 182
s
(Fo ) þ (0.0445P) þ 0.3917P] where
89.56(6)
73.63(2)
82.64(9)
120.0(4)
121.12(19)
122.9(3)
116.5(2)
120.78(16)
110.7(6)
N1eNi1eS1
C1eS2eNi1
C1eO1eC2
C6eN1eC10
C10eN1eNi1
N1eC10eC9
O1eC1eS2
O1eC2eC3
89.66(6)
82.84(10)
115.4(9)
117.9(2)
120.91(18)
121.8(3)
122.7(2)
107.9(9)
100(2)
2
2
0
Final R
0.0380
0.0885
1.057
2
wR (F )
Goodness-of-fit
(
D/s
)
max
0.001
ꢀ0.431 < Dr < 0.473 Åꢀ
3
Final residual electron
density
0
C3eC4eC5
O1eC2'-C3

I. Kour et al. / Journal of Molecular Structure 1128 (2017) 769e774
773
Fig. 4. ORTEP view of the molecule with displacement ellipsoids drawn at 40% probability level. H atoms are shown as small spheres of arbitrary radii.
3
.3. Biological studies
were mixed in the PDA and poured in the petriplates in sterilized
conditions inside the Laminar flow. After solidification, the plates
were inoculated with seven days old culture of pathogen, Rhizopus
nigricans by placing 2 mm bit in the centre of the plates. The
inoculated plates were incubated at 27 C for 4 days. The linear
growth of fungus in controlled manner was recorded at different
The antifungal activity of the parent compound and some of the
adducts was tested by Poisoned Food Technique against the patho-
genic fungus, Rhizopus nigricans. The test solutions were prepared by
dissolving the compounds in dimethylsulfoxide. The test solutions
ꢂ
Fig. 5. Packing diagram viewed down the b-axis.

774
I. Kour et al. / Journal of Molecular Structure 1128 (2017) 769e774
Table 7
out against the fungal strain Rhizopus nigricans. The butyl chain is
The Geometry of intramolecular interactions.
disordered over two set of sites, with occupancy ratios of 0.741:
0.259. These studies suggest a distorted octahedral structure and
paramagnetic nature of the adducts. Very few CeH..O and CeH/S
weak intramolecular interactions help stabilize the structure in the
unit cell.
ꢂ
DꢀH … A
DꢀH (Å)
H … A (Å)
D … A (Å)
q
[DꢀH … A ( )]
0
0
C4 -H3B/O1
0.966(16)
0.97(23)
1.008(6)
2.506(2)
2.402(1)
2.488(2)
3.016(17)
2.875(3)
2.989(6)
112.9(9)
109.56(5)
110.11(3)
0
C2 -H2 2 … S2
0
C4A-H3 1 … O1
concentrations of the complexes. The antifungal screening data are
given in Table 4, which shows that the colony diameter of the fungus
decreases as the concentration of the complex increases; that is, all
the complexes inhibited the growth of fungus significantly. This
shows a linear relationship between concentration and percent in-
hibition. The increase in antifungal activity is due to faster diffusion
of metal complexes as a whole through the cell membrane or due to
combined activity effect of the metal and the ligand. Such increased
activity of the metal complexes can be explained on the basis of
Overtone'sconcept [27] and Tweedy's chelation theory [28]. On
chelation, the polarity of the metal ion will be reduced to a greater
extent due to overlap of the ligand orbital and partial sharing of the
positive charge of the metal ion with donor group.
Acknowledgements
One of the authors (Rajni Kant) acknowledges the Indian
Council of Medical Research and the Department of Science and
Technology New Delhi, for the Financial Support under Research
Project No: BIC/12(14)/2012 and No EMR/2014/000467,
respectively.
Appendix A
CCDC No . 980793 contain the supplementary crystallographic
data for the compound. The data can be obtained free of charge via
www.ccdc.cam.ac.uk/data_request/cif by e-mailing data_request @
ccdc.cam.ac.uk, or by contacting The Cambridge Crystallography
Data Centre, 12 Union Road, Cambridge, CB2 IEZ, UK. Fax: +44(0)
3.4. X-ray crystallographic analysis
1223-33603.
The Ni atom in the title complex is octahedrally coordinated
2 4
within a trans-N S donor set, with the Ni atom located on a centre of
References
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arrangement of four sulfur atom from two chelating xanthate ligands
and two nitrogen atoms from two chloropyridines ligands. Bond
lengths and bond angles for non-hydrogen atoms are listed in
Table 6. The Ni1eN1 bond length is 2.115(2) Å. The NieS bond
lengths involving the xanthate ligands are 2.455(7) Å for Ni1eS1 and
[
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[
[
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[
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unit cell, viewed down the b-axis, is shown in Fig. 5. Molecules in the
crystal are packed together to form parallel layers. The complex is
stabilized by weak intramolecular interactions (Table 7).
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4
. Conclusions
(
[
Analytical results shows that the adducts have 1:2 stoichiom-
(
etry with general formula [Ni(S
2
COR)2.2L] (L ¼ 2-, 3-,4- ethyl-
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Online 29 (2013) 15e16.
pyridines, and 2-, 3- chloropyridines). Thermal studies indicate a
three step loss of weight with the formation of NiS as stable end
product. Antifungal activity of some complexes has been carried
[
[
33] X.H. Jiang, W.G. Zhang, Y. Zhong, S.L. Wang, Molecules 7 (2002) 549e553.
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m1064.