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TEXTURAL ANALYSIS OF A ONE-DIMENSIONAL METAL-ORGANIC
FRAMEWORK CATENA-[BIS (FORMATO) COPPER (II)
DIMETHYLAMINE]N OBTAINED FROM NITROGEN ADSORPTION.
Abdullaev A.Kh.
1
Yakubov Y.Y.
1
Ibragimov A.B.
1
Ruziyev U.U.
2
Kholto'raev Q.B.
2
1
Institute of General and Inorganic Chemistry of the Academy of Sciences of the
Republic of Uzbekistan. 77-a Mirzo Ulugbek Street, Tashkent
2
Termiz State University. 43 Barkamol Avlod Street, Termiz
ahrorabdullahabibjon@gmail.com
https://doi.org/10.5281/zenodo.14059034
The study of nitrogen adsorption properties of porous compounds provides
important information about their textural and structural characteristics. The N
2
adsorption properties of the newly synthesized MOF are shown in Figure 1. The
adsorption isotherm exhibited a steady increase from low to high relative
pressure, with a sharp rise as it approached P/P0=1. This indicates the presence
of two types of nanopores in the adsorbent: a small amount of micropores and a
large amount of mesopores. Along with Table 1 and Figure 2, it presents
important indicators such as surface
area, pore size, and their volume
distribution. These parameters were
determined
using
appropriate
adsorption isotherm models. These
results contribute significantly to
understanding
the
textural
properties of the adsorbent and are
important for potential application
areas.
Table 1 above provides important information about the textural properties
of the porous metal-organic framework catena-[bis (formato) copper (II)
dimethylamine]n and highlights its excellent surface characteristics. Specifically,
the specific surface area (S
BET
) is 352.31 m
2
/g, of which the mesopore area is
222.69 m
2
/g, demonstrating the metal-organic framework's efficiency in
adsorbing numerous molecules. The mesopore volume, determined by the
Barrett-Joyner-Halenda (BJH) method, is 0.973 cm
3
/g.
Figure 1. Nitrogen adsorption isotherm of
catena-[bis (formato) copper (II)
dimethylamine]n
ACADEMIC RESEARCH IN MODERN SCIENCE
International scientific-online conference
136
This indicates that the metal-organic framework is predominantly
mesoporous, as it is characterized by a larger volume of mesopores compared to
micropores. The volume of the largest pores (HK) is 0.0558 cm3/g.
Furthermore, the average pore radius, determined by the MP (micropore)
method, is 90.39 Å. Figure 4.10 provides a detailed differential distribution of
pores across the corresponding diameters in the analyzed metal-organic
framework. It has been established that this adsorbent contains two distinct
categories of pores: the recorded volume for pores with a diameter of 2-20
nanometers is approximately 0.227 cm3/g. However, when examining pores
larger than 2 nanometers in diameter, a consistent decrease in their distribution
is observed. Their volume in the range of 7.0-20 nanometers was approximately
0.973 cm3/g. This data on pore size distribution is crucial, as it significantly
contributes to understanding the adsorption properties of the metal-organic
framework and is therefore important for its application in numerous fields.
These data on the pore size distribution are very important, as they make a
Table 1. Texture characteristics of catena-[bis (formato) copper (II) dimethylamine]n
based on nitrogen adsorption
S
BET,
m
2
/g
352,31
t-Plot Micropore Area, m
2
/g
47,69
t-Plot external surface area, m
2
/g
107,16
Сumulative surface area of mesopores (BJH), m
2
/g
222,69
t-Plot micropore volume, cm³/g
0,227
Mesopores cumulative volume, cm³/g
0,973
Maximum pore volume (HK), cm³/g
0,056
Аverage pore diameter (4V/A by BET), Å
110,52
Median pore width, Å
16,37
Average pore hydraulic radius (V/A by MP method), Å
90,39
Figure 2. Volume histogram of catena-[bis (formato) copper (II) dimethylamine]n.
ACADEMIC RESEARCH IN MODERN SCIENCE
International scientific-online conference
137
significant contribution to understanding the adsorption properties of the
material-organic framework and are therefore important for its application in
many areas.
