Ferromagnetic interactions in new double end-on-azide-bridged dinuclear Ni(II) complex: Synthesis, crystal structures, magnetic and photoluminescence properties

Article abstract of DOI:10.1016/j.molstruc.2017.08.027

A new double end-on azide-bridged dinuclear nickel(II) Schiff base complex, [Ni₂(μ_1,1-N₃)₂(HL)₂(MeOH)₂], [HL = 2–[(2–hydroxypropylimino)methyl)–3,5–chlorophenol] has been synthesized and characterized by elemental analysis, UV and IR spectroscopy, single crystal X-ray diffraction, magnetic and photoluminescence study. The asymmetric unit contains half of the dinuclear unit. The Ni(HL) units in each dinuclear molecule are connected to each other by two bridging end-on azide ligands. In the crystalline architecture of the Ni(II) complex, intermolecular O–H?N hydrogen bonds link the molecules which form one-dimensional structure. Additionally, low temperature magnetic measurements indicate a dominant intradimer ferromagnetic interactions in double end-on azide-bridged dinuclear Ni(II) complex. Room temperature solid state photoluminescence measurements of Ni(II) complex show strong green emission band at λ_max = 508 nm while its free ligand H₂L shows broad yellow emission band at λ_max = 594 nm. The luminescent performances making Ni(II) complex may be good candidates for potential luminescence materials.

Full text of DOI:10.1016/j.molstruc.2017.08.027

Accepted Manuscript
Ferromagnetic interactions in new double End-On-azide-bridged dinuclear Ni(II)
complex: Syntheses, crystal structures, magnetic and photoluminescence
properties
Adem Donmez, Gorkem Oylumluoglu, M. Burak Coban, Cagdas Kocak, Muhittin Aygun, Hulya Kara
PII:
S0022-2860(17)31094-3
10.1016/j.molstruc.2017.08.027
MOLSTR 24165
DOI:
Reference:
To appear in:
Journal of Molecular Structure
Received Date:
Revised Date:
Accepted Date:
18 June 2017
06 August 2017
07 August 2017
Please cite this article as: Adem Donmez, Gorkem Oylumluoglu, M. Burak Coban, Cagdas Kocak,
Muhittin Aygun, Hulya Kara, Ferromagnetic interactions in new double End-On-azide-bridged
dinuclear Ni(II) complex: Syntheses, crystal structures, magnetic and photoluminescence
properties, Journal of Molecular Structure (2017), doi: 10.1016/j.molstruc.2017.08.027
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ACCEPTED MANUSCRIPT
Ferromagnetic interactions in new double End-On-azide-bridged
dinuclear Ni(II) complex: Syntheses, crystal structures, magnetic and
photoluminescence properties
Adem Donmez1,2,*, Gorkem Oylumluoglu1, M. Burak Coban3,4, Cagdas Kocak1, Muhittin
Aygun5, Hulya Kara1,3,*
1Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman
University, Mugla, 48050, Turkey
2Scientific Research Projects Coordination Unit, Mugla Sitki Kocman University, Mugla,
48050, Turkey
3Department of Physics, Balikesir University, Balikesir, 10145, Turkey
4Center of Sci and Tech App and Research, Balikesir University, Balikesir, 10145, Turkey
5Department of Physics, University of 9 Eylul, Izmir, Turkey
* Corresponding authors:
Prof. Dr. Hulya KARA
e-mail: karahulya04@gmail.com
Dr. Adem DONMEZ
e-mail: adonmez@mu.edu.tr
Address:
Department of Physics,
Molecular Nano-Materials Laboratory,
Mugla Sitki Kocman University, Mugla, 48050, Turkey
Phone: +90 252 2239280, Fax : +90 252 2111607

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Abstract
A new double end-on azide-bridged dinuclear nickel(II) Schiff base complex, [Ni2(µ1,1-
N3)2(HL)2(MeOH)2], [HL = 2–[(2–hydroxypropylimino)methyl)–3,5–chlorophenol] has
been synthesized and characterized by elemental analysis, UV and IR spectroscopy, single
crystal X-ray diffraction, magnetic and photoluminescence study. The asymmetric unit
contains half of the dinuclear unit. The Ni(HL) units in each dinuclear molecule are
connected to each other by two bridging end-on azide ligands. In the crystalline architecture
of the Ni(II) complex, intermolecular O−H···N hydrogen bonds link the molecules which
form one-dimensional structure. Additionally, low temperature magnetic measurements
indicate a dominant intradimer ferromagnetic interactions in double end-on azide-bridged
dinuclear Ni(II) complex. Room temperature solid state photoluminescence measurements
of Ni(II) complex show strong green emission band at max = 508 nm while its free ligand
H2L shows broad yellow emission band at max = 594 nm. The luminescent performances
making Ni(II) complex may be good candidates for potential luminescence materials.
Keywords: Single crystal X-ray analysis; Dinuclear nickel(II) complex;
Photoluminescence, Magnetism
1.
Introduction
Schiff base ligands have an important role as chelating ligands in the coordination of the
main group and transition metals, which can be used in various applications and synthesis
easily [1–12]. This research area is interesting with their special molecular structures and
their specific functionalities by using Schiff base ligands in the synthesis of polynuclear
complexes [13–16]. Metal complexes consisting of bridging groups have attracted
considerable attention due to their various molecular structures and applications [17–21].
The nickel (II) complexes containing Schiff bases and varieties of bridging pseudo-halides
can coordinate to the metal ions in different modes. In this context, among the pseudo-
halides, the azido ligand shows two typical bridging modes: μ-1,1 (end-on, EO) and μ-1,3
(end-to-end, EE) (Scheme 1) that generate dimeric and polymeric compounds. The most
important aspect of azido bridged complexes is the variety of their magnetic exchange

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interactions. The EO coordination mode shows ferromagnetic interaction while the EE
bridging mode shows antiferromagnetic interaction in the most cases [22–25].
N
N
N
N
N
N
N
N
N
M
M
M
M
N
N
N
End-to-End
End-On
Scheme 1. Possible coordination modes for azido ligands.
In addition, nickel (II) complexes have received considerable attention to have promising
application for their luminescence [26,27]. Although, a sizeable number of nickel(II) schiff
base complexes have been studied intensively due to their structural and magnetic properties
[23,28], there is few report on their photoluminescence properties [29,30]. In recent
communications, we and others have described the synthesis and characterization of mono-
and multinuclear Ni(II) Schiff base complexes [31–36]. In view of these findings and in an
effort to enlarge the library of such complexes, we present here the synthesis, crystal
structure, UV and IR spectroscopy, magnetic and photoluminescence study of a new double
end-on azido-bridged dinuclear Schiff base nickel(II) complex, [Ni2(µ1,1-
N3)2(HL)2(MeOH)2], [HL = 2–[(2–hydroxypropylimino) methyl)–3,5–chlorophenol]. To the
best of our knowledge, the solid-state photoluminescence properties of the azido-bridged
Schiff base nickel(II) complex is described here for the first time.
2.
Experimental
2.1.
Materials and physical measurements
All chemicals and solvents used for the synthesis were of reagent grade and used without
further purification. Elemental (C, H, N) analyses were carried out by standard methods with
a LECO, CHNS–932 analyzer. Solid state UV-visible spectra were measured at room
temperature with an Ocean Optics Maya 2000Pro Spectrophotometer. FT-IR spectra were
measured with a Perkin-Elmer Spectrum 65 instrument in the range of 4000 – 600 cm−1.
Solid state photoluminescence spectra in the visible and NIR region were measured at room
temperature with an ANDOR SR500i-BL Photoluminescence Spectrometer, equipped with

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a triple grating and an air-cooled CCD camera as a detector. The measurements were done
using the excitation source (349 nm) of a Spectra-physics Nd:YLF laser with a 5 ns pulse
width and 1.3 mJ of energy per pulse as the source. DC magnetic measurements were
performed using a QD Squid magnetometer with applied field of 0.1 T, except when
otherwise stated. To avoid possible orientation effects, microcrystalline powders were
pressed in pellets. The data were corrected for sample holder contribution and diamagnetism
of the sample using Pascal constants. Powder x-ray diffraction (PXRD) patterns were
recorded on a Bruker-AXS D8-Advance diffractometer by using Cu-Kα radiation (λ=1.5418
Å) in the range 5° < 2θ < 50° in θ-θ mode with a step ns (5s < n < 10s) and step width of
0.03°. Comparison between experimental and calculated (from CIF's) PXRD patterns was
performed with Mercury 3.9 [37].
X-ray single crystal data for Ni(II) complex was collected on an Xcalibur, Eos
diffractometer at 293 K using MoK radiation (λ = 0.71073 Å) [38]. The data were collected
for Lorentz, polarization and absorption effects using the analytical numeric absorption
correction technique [39]. Using Olex2 [40], the structure was solved by direct methods
using SHELXS [41] and refined by full-matrix least-squares based on |Fobs|2 using SHELXL
[42]. The crystallographic data and structure refinement detail for Ni(II) complex is given in
Table 1. All non-hydrogen atoms were refined anisotropically. Hydrogen atom positions
were calculated geometrically and refined using the riding model. The hydroxyl H atom was
located in difference Fourier map and its position was allowed to refine with an O-H bond-
length restraint of 0.84(2) Å. Details of the supramolecular π-interactions were calculated
PLATON 1.17 program [43]. The crystal data and structure refinement details for the
complex are listed in Table 1.
2.2. Synthesis of tridentate Schiff base ligand, H2L
The tridentate Schiff base ligand, [H2L= 2–[(2–hydroxypropylimino)methyl)–3,5–
chlorophenol], was prepared by mixing 3,5-dichlorosalicylaldehyde (1 mmol, 0.191 g) and
3-amino-1-propanol (1 mmol, 0.075 g) in hot methanol (50 ml). The solution obtained was
stirred at 65 °C for 30 min. The yellow product of the ligand was precipitated from the
solution on cooling. HL: Yellow compound, yield 78%. Anal. Calcd. for Cl2C10H11N1O2
(%): C, 48.41; H, 4.47; N, 5.65. Found (%): C, 48.36; H, 4.49; N, 5.63.

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2.3.
Synthesis of Ni(II) Complex
Ni(II) complex was prepared by addition of nickel(II) acetate tetrahydrate (0.249 g, 1 mmol)
in 30 ml of methanol and sodium azide (0.065g, 1 mmol) in 10 ml of methanol to the ligand
(H2L) (0.248 g, 1 mmol) in 30 ml of methanol. This solution was warmed to 65 °C and
stirred for 1h. The resulting solution has been filtered rapidly and then allowed to stand at
room temperature. After several weeks green crystals of Ni(II) complex suitable for X-ray
analysis were obtained. Structure of the tridentate ONO-donor Schiff base ligand (H2L) and
relevant equations for the formation of the Ni(II) complex is presented in Scheme 2. Clear
green crystals, yield 72%. Anal. Calcd. For C22H28Ni2N8O6 (%): C, 42.76; H, 4.57; N, 18.13.
Found (%): C, 42.75; H, 4.55; N, 18.14.
H
N
OH
Cl
Cl
O
MeOH
+
OH
H2N
OH
OH
Cl
Cl
MeOH
Cl
Cl
N
OH
MeO
N
N
O
Ni
N
N
Ni
N
O
OMe
N
HO
N
Cl
Cl
Scheme 2. The synthetic route of ligand H2L and Ni(II) complex

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3.
Results and discussion
3.1.
X–ray structure of Ni(II) Complex
The complex is double end-on azide-bridged dinuclear Schiff base nickel(II) complex
and its asymmetric unit consists of half of the dinuclear [Ni2(µ1,1-N3)2(HL)2(MeOH)2]
molecules (Fig.1). The Ni(HL) units in dinuclear molecule are connected to each other by
two bridging end-on azide ligands. Each Ni(II) atom is six-coordinated by the ONO donor
set of the Schiff base ligand and by one terminal N atom of one bridging azide ligand,
defining the basal plane, and by one terminal N atom from the other bridging azide ligand
and one donor O atom from the MeOH molecule occupying the axial positions. The three
trans angles at each Ni atom lie in the range 171.46 (12)178.71 (16)°. The other angles
subtended at the Ni atom range from 85.00 (14) to 95.18 (13)°, indicating somewhat distorted
octahedral configurations. Selected bond lengths and angles are listed in Table 2, which lie
well within the range of reported values for corresponding bond lengths and angles of other
dinuclear nickel(II) complexes [22,23,44–48]. The bridging azide groups are nearly linear
and show bent coordination modes with the nickel atoms. The intramolecular distance of
Ni1···Ni1i (symmetry code: (i) −x+1, −y+1, −z+1) is found to be 3.10 Å. X-ray single crystal
determination shows that the Ni(II) complex forms a self-assembling continual 1D
supramolecular chain-like structure by O3–H3···N4 intermolecular hydrogen bonding along
b axis. (Fig.2b). C–H···Cl intermolecular hydrogen bonds link the molecules which form
two-dimensional structure in the bc-plane (Fig. 3a). With the help of intermolecular
hydrogen bonding C–H···N, O–H···π and π···π interactions, a self-assembled 3D
supramolecular structure is formed (Fig.2a, Table 3).

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Table 1. Crystal data and structure refinement for Ni(II) complex.
Chemical Formula
Formula weight (g mol–1 )
Crystal system
C22H28Cl4N8Ni2O6
759.74
Orthorhombic
Pbca,
Space group
Unit cell dimensions
a = 19.1422 (16) Å
b = 7.7745 (9) Å
c = 21.0882 (18)
3138.4 (5)
4
V / Å3
Z
calc / g cm-3
1.608

μ/mm-1
1.59
Temperature (K)
Reflections collected
Independent reflections
294
6216
2962
Goodness–of–fit on F2
1.00
R1 = 0.052, wR2 = 0.109
R indices [I>2(I)]

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Table 2. Some selected bond lengths [Å] and angles [°] for Ni(II) complex.
Ni1—O1
Ni1—O2
Ni1—O3
Ni1—N1
1.978 (3)
2.104 (3)
2.077 (4)
2.001 (3)
Ni1—N2i
Ni1—N2
N2—N3
N3—N4
2.106 (3)
2.100 (4)
1.181 (5)
1.158 (5)
O1—Ni1—O2
O3—Ni1—N2
N1—Ni1—N2i
O1—Ni1—O3
O1—Ni1—N2
O1—Ni1—N2i
O1—Ni1—N1
O2—Ni1—N2i
171.46 (12)
175.04 (14)
178.71 (16)
92.11 (14)
89.38 (14)
87.83 (13)
91.60 (14)
85.29 (13)
N1—Ni1—O2
N1—Ni1—O3
N1—Ni1—N2
N2—Ni1—O2
N2—Ni1—N2i
O3—Ni1—N2i
O3—Ni1—O2
N4—N3—N2
95.18 (13)
90.89 (15)
93.80 (14)
85.00 (14)
85.04 (15)
90.28 (15)
92.97 (14)
177.7 (5)
Symmetry code: (i) −x+1, −y+1, −z+1.

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Table 3. Hydrogen bond geometry (Å, ) and distance between ring centroids [Å] for Ni(II)
complex.
Symmetry
-x, 2-y, 1-z
x,-1+y,z
DHA*
DH
0.83
0.84
0.93
0.97
HA
2.02
2.01
2.61
2.83
DA
2.795
2.827
3.537
3.538
DHA
155
O2H2O1
165
O3H3N4
1/2-x,-1/2+y,z
1/2-x,2-y,1/2+z
172
C7H7N4
131
C10H10BCl2
O–H···Cg(I)
O2H2Cg(1)
O2H2Cg(1)
Cg(I)···Cg(J)
Cg(4)···Cg(4)
Cg(4)···Cg(4)
0.99
0.99
2.36
2.36
2.466
2.466
87
87
x, y, z
-x, 2-y, 1-z
Cg(I)···Cg(J)
4.537
1/2-x,-1/2+y,z
1/2-x,1/2+y,z
4.537
*D: Donor, A: Acceptor, Cg(I): Plane number I (= ring number in () above), Cg(I)-Cg(J) =
Distance between ring Centroids, Cg(1): Ni1-N2-Ni1a-N2a, Cg(4): C1-C2-C3-C4-C5-C6.

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Figure 1. ORTEP drawing of Ni(II) complex showing the atom labelling scheme (with 50%
probability displacement ellipsoids).

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(a)
(b)
Figure 2. (a) The crystal packing view of Ni(II) complex. (b) A perspective view of one-
dimensional chain structure along b axis, showing the intermolecular OHN hydrogen
bonds (dashed lines).
(a)
(b)
Figure 3. (a) A perspective view of two-dimensional structure, showing the intermolecular
OHN and C–H···Cl hydrogen bonds (dashed lines). (b) Space filling representation of
Ni(II) complex as in Fig. 2a.

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3.2. X-ray powder diffraction pattern of Ni(II) complex.
Before proceeding to the magnetic, spectroscopic and photoluminescence
characterization, we note that experimental powder X-ray pattern for Ni(II) complex are well
in position with those of simulated patterns on the basis of single crystal structure of Ni(II)
complex (Fig. 4).
Figure 4. X-ray powder diffraction pattern of Ni(II) complex (Red simulated from
CIFs, Black Experimental).
3.3. IR and Electronic Spectra
The IR spectra of Ni(II) complex is analyzed in comparison with that of its free ligand, H2L
in the range 4000–600 cm−1 in Figure 5. The weak and broad absorption band at 3232 cm-1
is assigned to υ(O–H) stretching for the free ligand, H2L. After complexation, υ(O–H)
absorption peak shifts to 3172 cm-1 for Ni(II) complex [49,50]. Additionally, a new
absorption peak appears at 3365 cm-1 and it can be attributed to the υ(O–H) stretching of the
coordinated methanol molecule to the Ni(II) atom [51]. In the IR spectra of the free ligand,
a high intensity ʋ(C=N) band is observed at 1649 cm-1. This band is shifted towards lower
side and observed at about 1625 cm-1 for Ni(II) complex. This downward shift shows the
coordination of azomethine nitrogen to the Ni(II) ion. The strong band at 2078 cm-1 for the

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Ni(II) complex is attributed to the υ(NN) stretching of the bridging end-on azide groups
[53,54]. The medium intensity bands are also observed in the broad region between 1100
and 700 cm-1 which are assigned to (C–Cl) of the chlorobenzene ring [55, 56].
Figure 5. The IR spectrum of the H2L (black line) and Ni(II) complex (red line).
The UV-Vis electronic spectra of the free ligand H2L (black line) and its Ni(II) complex
(red line) are indicated in Figure 6. The electronic spectrum of the free ligand (H2L) shows
a high broad absorption band at 373 nm. This arises process may be due the conjugated
systems. On the contrary the UV-Vis spectrum of Ni(II) complex has been seen two different
absorption bands at 308 nm and 442 nm. These absorption bands can be attributed to the
n→π* or π→π* electronic transition for the lower one and can be attributed to the d→d
transition for the higher one, respectively [44,54,57].

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Figure 6. The solid state UV-Vis spectrum of the free ligand H2L (black line) and Ni(II)
complex (red line).
3.4 Photo-physical study
To be able to find out the emission process of the Ni(II) complex and its free ligand H2L, the
solid-state photoluminescence (PL) spectroscopy were carried out at room temperature in
the visible regions upon excitation at ex= 349 nm. In the Fig. 7, the PL spectrum of both
samples have been shown and it can be easily seen that both spectra show broad emission
bands. The free ligand H2L shows broad yellow emission band at max = 594 nm which may
be assigned to the π→π* electronic transition (ILCT) [58,59]. Ni(II) complex show stronger
green emission band at max = 508 nm. Effect of the bonding metal atom to the ligand may
be responsible for the blue shift of this emission peak [60]. The enhancement of
luminescence for Ni(II) complex may be attributed to the chelation of the ligand to the
central metal atom. The chelation enhances the “rigidity” of the ligand and thus reduces the
loss of energy through a radiationless pathway [61].

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Figure 7. The emission spectra of the free ligand H2L (yellow line) and Ni (II) complex
(green line) in the solid samples at room temperature. (Upper-left photo is photoluminescent
image of Ni(II) complex and upper-right photo is photoluminescent image of ligand H2L,
while excited at 349 nm.
3.5 Magnetic properties
The temperature dependence of the magnetic susceptibility of powdered
polycrystalline samples of Ni(II) complex in the 1.9−40 K temperature range with an applied
Dc field of 1 KOe and in the 40−300 K temperature range with an applied Dc field of 10
KOe is represented in the form χM and χMT vs. T plots (χM is the susceptibility per dimeric
unit) in Fig 8. The χMT value at room temperature, 2.72 cm3 K mol-1, which is as expected
for two magnetically spin triplets (g > 2.00), and agrees with the value found for similar
compounds [23,44,62]. When the temperature is decreasing, the χMT value steadily increases
reaching a maximum at 16 K (3.61 cm3 K mol-1) then decreases to 2.02 cm3Kmol-1 at 1.9 K.
This feature confirms the presence of significant intramolecular ferromagnetic exchange
interaction between the NiII ions leading to a S = 2 ground state. The decrease in χMT at low
temperatures is more likely due to zero-field splitting effects of the ground state (D) and/or
possible intermolecular antiferromagnetic interactions between the dimers (zJ ) [53].
Ginsberg [63] pointed out that both D and zJ are very strongly dependent on each other and
show same results at low temperature. Thus it is difficult to calculate these values with

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reasonable accuracy. That is why neglecting D as a fitting parameter, the data were fit using
the theoretical χM vs. T expression for a dimer of two S=1 nickel (II) ions.
The experimental magnetic susceptibility data have been analyzed using the isotropic
spin Hamiltonian H = −2JS1S2 for spin coupled dinuclear with S1 = S2=1 as shown in Eq. (1)
[62], where x = J / kT. In addition, the inter-dimer exchange interaction was taken into
account by using the mean field approximation Eq. (2) [62].
2Ng2B2 e2J / kT  5e6J / kT
dimer

(1)
(2)
kT 1 3e2J / kT  5e6J / kT
dimer
M 
1 dimer

2zJ'/ Ng2 2

Where χM represents the magnetic susceptibility per dinickel(II), zJ is the inter-dimer
exchange parameter, z is the number of nearest neighbors of each dimer (z=2) and the other
symbols have their usual meaning. The obtained best fit parameters for the experimental data
are; J = +9.26 cm– 1, zJ' =  0.13 cm– 1, g = 2.30 (R2 = 0.9995). These values are comparable
to those of related Ni(II)-azides complexes, [28,44,45,53,62] and confirm that the
interactions mediated via the double EO azide bridges are ferromagnetic couplings.
The magnetic susceptibilities conform well to Curie-Weiss law (m = C / (T )) in
the range of 1.9–300 K for complex (1) with a positive Weiss constant ( = + 4.99 K and C
= 2.64 cm3 K mol-1). The positive θ confirms the ferromagnetic interactions between the
NiII ions. As a complementary characterization, the field-dependent magnetization for Ni(II)
complex has been measured at 2.0 K (Fig. 9). The field dependence of the magnetization
matches well with the Brillouin function for an Stotal = 2 spin state, indicating the
ferromagnetic interactions in Ni(II) complex. The fact that the magnetization is not fully
saturated at high field may be due to the presence of a significant magnetic anisotropy.

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Figure 8. Temperature dependence of χMT vs T and χM-1 vs T for Ni(II) complex. The solid
red line represents the best-fit obtained using Eq. 2. The solid green line represents the best
fit using Curie-Weiss law. (Inset-the magnetic exchange coupling pathway for Ni(II)
complex).
S=2
4
3
2
1
0
0
1
2
3
4
5
H/ KG
Figure 9. Field dependence of magnetization (black-squares); the solid red line was plotted
according to the Brillouin function for an S = 2 spin system.

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4. Conclusions
We have presented the preparation, and structural, spectroscopic and magnetic
characterizations of a new double EO azido-bridged dinuclear nickel(II) complex. Analysis
of its variable-temperature magnetic study revealed a ferromagnetic behavior with J = +9.26
cm– 1. Furthermore, photoluminescence studies show the blue shift and the stronger of the
emission compared with its free ligand as a result of the influence of the coordination of
metal atom to the ligand. The luminescent properties showed that the photoluminescence
arose from the intraligand emission, and that it is novel potential candidates for applications
in optoelectronic devices.
Supplementary data
Crystallographic data for the structure reported in this paper have been deposited with the
Cambridge Crystallographic Data Centre (The Director, CCDC, 12 Union Road, Cambridge,
CB2 1EZ, UK; e–mail: deposit@ccdc.cam.uk; www: http://www.ccdc.cam.ac.uk; fax: +44
1223 336033) and are available free of charge on request, quoting the Deposition No. CCDC
1547546.
Acknowledgements
The authors are grateful to the Research Funds of Mugla Sitki Kocman University (BAP-
2017/029) for the financial support and to Dokuz Eylül University for the use of the Agilent
Xcalibur Eos diffractometer (purchased under University Research Grant No.
2010.KB.FEN.13). The authors also acknowledge to Balikesir University, Science and
Technology Application and Research Center (BUBTAM) for the use of the
Photoluminescence Spectrometer.

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Highlights
 Synthesis of a double end-on azide-bridged dinuclear nickel(II) complex.
 Characterization of the Ni(II) complex by UV-Vis, IR and X-ray diffraction.
 Magnetic and photoluminescence properties of Ni(II) complex have been investigated.