XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
136
T1: P–3
Spectroscopic and theoretical studies of adamantane-containing triazole
thiones, promising for drug design
Maksim Shundalau
1,2
, Yuliya Mindarava
1
, Anna Matsukovich
3
,
Sergey Gaponenko
1,3
, and Ali A. El-Emam
4
1
Physics Department, Belarusian State University, 4 Nezaležnaści Ave., 220030, Minsk, Belarus,
shundalov@bsu.by
2
A.N. Sevchenko Institute of Applied Physical Problems at Belarusian State University, 7 Kurčataǔ
Str., 220108, Minsk, Belarus
3
B.I. Stepanov Institute of Physics, National Academy of Science of Belarus, 68 Nezaležnaści Ave.,
220072, Minsk, Belarus
4
Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh
11451, Saudi Arabia
The adamantane derivatives represent a class of organic compounds finding medical
applications owing to their ability to therapeutic activity [1]. The inserting of an adamantyl
fragment into the structure of molecules leads to the compounds with relatively high
lipophilicity, and it can modify their biological activity. Two adamantane-containing compounds
(3-(adamantan-1-yl)-1-[(4-benzylpiperazin-1-yl)methyl]-4-phenyl-1H-1,2,4-triazole-5(4H)-
thione, C
30
H
37
N
5
S, and 3-(adamantan-1-yl)-4-phenyl-1-[(4-phenylpiperazin-1-yl)methyl]-1H-
1,2,4-triazole-5(4H)-thione, C
29
H
35
N
5
S) were recently synthesized and their molecular structure
were established in the crystalline phase by X-ray studies [2, 3].
This study presents the results of the comprehensive experimental (FT-IR, Raman, UV/Vis
spectra) and theoretical (DFT and Multi-Reference Perturbation Theory calculations, biological
activities predictions) studies of the structural and spectral properties of the above-mentioned
adamantane-containing compounds. The FT-IR and Raman spectra of the compounds for the
crystalline phase have been measured in the ranges of 3200–650 and 3200–150 cm
–1
,
respectively. The UV/Vis spectra of solution of the compounds in ethanol were measured in the
range of 450–200 nm and demonstrate the intramolecular charge transfer features. The
calculations of structural parameters and vibrational spectra were performed at the
DFT/B3LYP/cc-pVDZ level of theory. The calculations of electronic structure and
characteristics of the excited electronic states were performed at the TDDFT/CAM-B3LYP/cc-
pVDZ+SMD (ethanol) and multi-reference CASSCF/XMCQDPT2 levels of theory.
Based on the structure of the molecules the biological activity indices were predicted. It is
established that compounds under consideration are very likely to exhibit the analgesic
activities. The complete interpretation of the vibrational spectra was carried out based on
quantum chemical modeling. The UV/Vis spectra simulations at the CASSCF/XMCQDPT2
level of theory results a good agreement with the experimental spectra. In continuation to our
interest in the pharmacological and structural properties of the adamantane derivatives, the
results of the present study will help to achieve a better understanding of the properties of such
derivatives, and it may be useful in medicinal chemistry and for a drugs design.
Keywords: adamantane-containing compounds; IR spectrum; Raman spectrum; UV/Vis spectrum; DFT;
multi-reference perturbation theory
Acknowledgment
This work is supported by the MOST foundation (EU funded project for enhancing professional contacts
between Belarus and the EU).
References
[1] G. Lamoureux, G. Artavia, Curr. Med. Chem. 17 (2010) 2967.
[2] E.S. Al-Abdullah, H.H. Asiri, A. El-Emam, S.W. Ng, Acta Cryst. E 68 (2012) o344.
[3] E.S. Al-Abdullah, H.H. Asiri, A. El-Emam, S.W. Ng, Acta Cryst. E 68 (2012) o345.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
137
T1: P–4
New complex of guanidine with trichloroacetic acid.
The comparison of theoretical and experimental data
Marek Drozd
1
, Marek Daszkiewicz
1
1
Division of Structure Research, Institute of Low Temperature and Structure Research, Polish
Academy of Sciences, Okólna 2 str., Wrocław, Poland, e-mail: m.drozd@int.pan.wroc.pl
A guanidinium cation create many interesting compounds with different inorganic and
organic acids. Some of these chemical complexes exhibit various types of structural phase
transitions, some of them being ferroelectric substances. On the other hand the new compounds,
without macroscopic symmetry center, based on guanidinium ion are created for using in
nonlinear optic as second harmonic generators.
A guanidine molecule with only ten atoms (CN
3
H
6
) belongs to the simplest organic chemical
compound, but plays a crucial role in the features of investigated compounds. The specific
planar configuration with sp
2
hybridization of carbon atom makes that investigated cation can be
used as potential H-donor in hydrogen bonds and these “weak” chemical interactions play the
most important role in studied compounds.
Ten years ago the theoretical calculations of equilibrium geometry, vibrational spectra and
potential energy distribution (PED) were performed for real guanidinium acetate complex [1].
The very good agreement between experimental and theoretical spectra was found. On the basis
of this work the theoretical DFT calculations were extended for two “virtual” complexes:
guanidinium trichloroacetate and guanidinium trifluoroacetate. The obtained results (values of
calculated enthalpies) suggest strongly that these two compounds should exist in real
experiment.
After many attempts the guanidinium trichloroacetate compound was synthesized. The small
crystals of guanidinium trichloroacetate were grown from the aqueous solution containing
guanidinium cations and trichloroacetate anions in a stoichiometric ratio 1:1 at stable ambient
temperature.
For this new compound the detailed X-ray crystallographic studies were performed.
Additionally the IR and Raman spectra were measured. Unfortunately, the DSC investigations
performed in the range 100–400 K did not shown any phase transitions. These experimental
results and previous DFT calculations are presented on poster in details.
These presented results should give reply to the most important question: Are carried out
theoretical calculations (predicted structure and vibrational spectra) compatible with received
experimental results?
Keywords: guanidine; hydrogen bonds; vibrational spectra
Acknowledgment
I would like the Mateusz Drozd to express thanks for the help in the preparation of crystals.
References
[1] M. Drozd, Spectrochim. Acta A 69 (2008) 1223
.
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