“TIBBIYOT OLIYGOHLARIDA TABIIY FANLARNI
INTERFAOL USULLARDA O'QITISHNING
MUAMMOLARI VA YECHIMLARI”
120
SYNTHESIS AND STRUCTURAL ANALYSIS OF A MIXED-LIGAND COORDINATION
POLYMER WITH Cd (II) BASED ON 1-HYDROXY-2-NAPHTHOIC AND ACETIC
ACIDS
1
Turaev Kh.Kh.,
2
Ibragimov A.B.,
1
Saidov D.Kh
1
Termiz State University, Barkamol Avlod Street, Termiz,
2
Institute of General and Inorganic
Chemistry, Academy of Sciences of Uzbekistan, Tashkent
Е-mail:
Annotation.
The mixed-ligand coordination polymer, synthesized using 1-Hydroxy-2-
naphthoic acid, tartaric acid, and Cd(NO
3
)
2
·4H
2
O, stands out due to its unique structural and
physicochemical properties. This compound finds widespread application in the fields of adsorption
and nanotechnology. The research focuses on synthesizing this polymer and investigating its crystal
structure, morphology, and other characteristics through modern analytical techniques.
Keywords:
Mixed-ligand, 1-hydroxy-2-naphthoic acid, tartaric acid, cadmium nitrate
tetrahydrate, crystal structure, FT-IR analysis
Introduction
In recent years, scientific interest in the synthesis of coordination polymers (CP) has
significantly increased. This is due to their unique structural features and wide possibilities in the
field of practical application [1]. However, the effective design and synthesis of coordination
polymers with the desired structure and functional properties remains a serious problem for
researchers [2]. Therefore, significant scientific research is being conducted in this area.
Due to simplicity the vast majority of the MOFs reported so far have homometallic SBUs [3,
4]. The condition of reversibility in the metal-ligand coordination required to obtain highly crystalline
materials can be easier achieved for only one type of metal ion. In addition, the clusters of single
metal ions appearing during the early stages of the synthesis may exhibit certain preferred
coordination geometries resulting in periodic reticulation forming a crystalline solid rather than an
amorphous phase [5].
Starting from the current knowledge on the synthesis mechanism and procedures for post-
synthetic modification, a logical evolution in the area is to increase further the complexity of MOF
structures to obtain a new generation of materials with improved performance. The term
“heterogeneity” in MOFs will be used hereafter to denote the presence of several types of SBUs
and/or covalently linked functionalities within the crystal periodic structure of the MOF [6].
Porous coordination polymers (PCPs), which are microporous materials, have been given
much attention from both scientific and commercial aspects regarding their application to gas storage,
gas separation and catalytic reaction because of the regularity of their pore shape and pore size,
accompanied with the functionality. Moreover, in recent years, flexible PCPs, which are structurally
transformable depending upon external stimuli, have been attractive because they provide unique
properties, dissimilar to those of zeolites. In this review, the chemistry and application of flexible
crystalline PCPs are summarized and discussed [7,8,9].
The main goal of the research is to synthesize a new coordination polymer that forms a stable
complex with cadmium (II) ions in the presence of 1-hydroxy-2-naphthoic acid and tartaric acid, to
determine its crystal structure, and to study intermolecular interactions.
Experimental.
In this study, the composition, structure, and physicochemical properties of
the synthesized polymer were determined using IR spectroscopy analysis.
The compounds used in this study - 1-hydroxy-2-naphthoic acid and tartaric acid - were
obtained from Sigma-Aldrich as chemically pure reagents.
Synthesis:
0.282 g (0.05 mmol) of 1-hydroxy-2-naphthoic acid was completely dissolved in a
mixture of 20 ml of 96% ethanol and 10 ml of N,N-dimethylformamide (DMF). At the same time,
0.2251 g (0.05 mmol) of tartaric acid was dissolved in a system of solvents in the same ratio, and the
resulting solutions of both ligands were combined. The mixture was stirred at a constant rate for 30
“TIBBIYOT OLIYGOHLARIDA TABIIY FANLARNI
INTERFAOL USULLARDA O'QITISHNING
MUAMMOLARI VA YECHIMLARI”
121
minutes using a magnetic stirrer to obtain a homogeneous brown solution. Subsequently, 0.463 g
(0.05 mmol) of cadmium nitrate tetrahydrate (Cd(NO
3
)
2
·2H
2
O) was dissolved in 30 ml of distilled
water and added dropwise to the prepared ligand solution under control. The reaction mixture was
stirred in a magnetic stirrer for 1 hour. After this, the mixture was treated in an ultrasonic sonicator
with a power of 500 W for 15 minutes, which accelerated the reaction efficiency and the complex
formation process. The solution was filtered through filter paper, and the purified filtrate was
obtained. For crystallisation, the filtrate was placed in a thermostat at a temperature of 50-60°C and
stored for 25 days, creating conditions for slow evaporation of solvents. At the end of the process,
crystals with a colourless, cubic morphology were formed
(Figs. 1 and 2).
The total crystal yield of
the synthesis process was 70%.
Fig. 1 Polymer synthesis reaction
Fig. 2 Polymer crystal production scheme
FT-IR analysis
. In the FTIR spectrum of the coordination polymer synthesised from 1-
hydroxy-2-naphthoic acid, tartaric acid, and Cd(NO
3
)
2
·4H
2
O)
2
·4H
2
O, broad vibrations observed at
3402 and 3322 cm
−1
are attributed to -OH groups, while the signal at 1627 cm
−1
corresponds to the
C=O group coordinated with Cd2
+
. The intensities in the range of 1237-1084 cm⁻¹ correspond to C-
O vibrations, confirming the ligand-metal bond. The peaks at 1421 and 1292 cm⁻¹ indicate the
presence of an aromatic ring. In the range of 759-425 cm
−1
, we found specific low-frequency
vibrations of Cd-O bonds, showing that the metal-ligand coordination in the polymer structure was
successfully formed
(Figure 3).
Fig. 3 IR spectrum of a polymer compound
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REFERENCES
•
D. X. Saidov, 1X. X. To‘rayev, A. B. Ibragimov, B. Z. Adizov, A. Sh. Jo‘rayev, Z. V.
Nurullayeva. Study of the structure and properties of a mixed-ligand polymer synthesized using
1.10-phenanthroline, tartaric acid, and copper nitrate uzbek chemical journal
//
Toshkent– 2025,
№2 S 42-50
•
Cao X., Mu B., Huang R. Synthesis of a series of coordination polymers based on
mixed ligands to tune the structural dimension //CrystEngComm. – 2014. – Т. 16. – №. 23. – С.
5093-5102.
https://doi.org /10.1039/C3CE42272K
•
S. A. A. Razavi, M. Y. Masoomi, T. Islamoglu, A. Morsali, Y. Xu, J. T. Hupp, O. K.
Farha, J. Wang, P. C. Junk, Inorganic Chemistry 2017, 56, 2581-8.
•
S. A. A. Razavi, M. Y. Masoomi, A. Morsali, Chemistry – A European Journal 2017,
23, 12559-64.
•
T. R. Cook, Y.-R. Zheng, P. J. Stang, Chemical Reviews 2013, 113, 734-77.
H. Furukawa, U. Müller, O. M. Yaghi, Angewandte Chemie International Edition 2015,
54, 3417- 30
•
FujitaMKwonY
JWashizuSOguraK
1994 J.
Am.
Chem.
Soc. 116
1151
•
SeoJ
SWhangDLeeHJunS
IOhJJeonY
JKimK
2000 Nature 404
982
•
HasegawaSHorikeSMatsudaRFurukawaSMochizukiKKinoshitaYKitagawaS 2007 J.
Am. Chem. Soc. 129 2607
http://dx.doi.org/10.1021/ja067374y
•
Gomez-LorBGutierrez-PueblaEIglesiasMMongeM
ARuiz-ValeroCSnejkoN
2005 Chem. Mater. 17 2568
http://dx.doi.org/10.1021/cm047748r
