XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
268
T4: P–1
Study of physical-chemical properties of As-S chalcogenide films
prepared by plasma-enhanced chemical vapor deposition
Leonid Mochalov
1,3
, Aleksey Nezhdanov
1
, Mikhail Kudryashov
1
, Alexandr Logunov
1
,
Dominik Dorosz
2
, Giuseppe Chidichimo
4
, Giovanni De Filpo
4
, and Aleksandr Mashin
1
1
Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia,
e-mail: nezhdanov@phys.unn.ru
2
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Krakow,
Poland
3
Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, Russia
4
Department of Chemistry, University of Calabria, P. Bucci-15c, Rende (CS), Italy
First time the method of Plasma-Enhanced Chemical Vapor Deposition (PECVD) was used
for preparation of chalcogenide films of different chemical and phase composition [1]. IR
transparency of the films was measured in the range of 2-20 μm (Fig. 1a). The spectrum of As-S
sufficiently differs from the typical spectrum of As-S glass (given in insertion) [2] due to the
higher degree of transparency (up to 80%) and the wider range of transparent window (up to 18
μm) without lines of intrinsic adsorption of glass net and selective absorption of different
functional groups.
Fig. 1. IR absorption and Raman spectra of As-S thin films prepared by PECVD.
It allows to conclude that in the case of plasma the obtained As-S films possess substantially
different as structure as well optical properties in comparison with typical As
2
S
3
glasses. The
structure of thin films was studied by Raman spectroscopy (Fig. 1a). Firstly of all, it should be
noted, that the whole baseline of the Raman spectrum poses sufficiently higher in comparison
with the spectrum of the bulk sample of As
2
S
3
(insertion 1) and includes the structural unit of
glass net AsS
3/2
(340 cm
–1
and 367 cm
–1
) and linear modification of sulfur (485 cm
–1
). The
analogical abnormal curve behavior was mentioned in for the realgar of natural structure
(insertion 2). It may be suggested that the structural modification during the plasma deposition
process seems to be the reason of luminescence.
Keywords: As-S chalcogenide films; PECVD; molecular spectroscopy
Acknowledgment
The reported study was supported by the basic part of State Task no. 2014/134 for years 2017–2019 (project
1958).
References
[1] L. Mochalov, A. Nezhdanov, M. Kudryashov, et al., Plasma Chem Plasma Process (2017).
doi:10.1007/s11090-017-9830-xA.
[2] E. Farm, M.J. Heikkila, M.Vehkamaki, K. Mizohata, M. Ritala, M. Leskela, M. Kemell. J. Vac. Sci.
Technol. (2017) 245.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
269
T4: P–2
Impact of tautomeric equilibrium on BODIPY chromophore
Marina Laine
1
, Volker Leen
2
, Joseph Molisho Ngongo
3
, Bram Verbelen
2
,
Wim Dehaen
2
, Elena Nesterova
4
, and Aleksander Filarowski
1
1
Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383, Wrocław, Poland.
e-mail: aleksander.filarowski@chem.uni.wroc.pl
2
Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200f – bus 02404, 3001
Leuven, Belgium.
3
Faculty of Science, Universite de Kinshasa, B.P. 190, Kinshasa XI, Democratic Republic of the
Kongo.
4
Department of Physics, Industrial University of Tyumen, 625-000, Tyumen, Russian Federation
An intramolecular tautomeric fluorescent BODIPY sensor has been designed and
synthesized. The obtained BODIPY dye is a combination of the diaza-4-bora-s-indacene core
and the diketone or imine fragments [1]. The study of conformational equilibria (Fig. 1) in the
ground and excited states has been completed within the broad range of the polarity of solvents
by the UV, NMR, steady state methods as well as by DFT and TD-DFT calculations. A scheme
of the processes occurring in studied compounds dye has been proposed. The interpretation of
the unique emission observed in hydrogen bond accepting solvents under the excitation of the
fluorescent dye in the absorption band of the S
0
–S
2
transition has been accomplished.
N
+
N
B
-
F
F
O
O
H
C
H
3
CH
3
Cl
Cl
N
+
N
B
-
F
F
O
O
C
H
3
CH
3
H
Cl
Cl
N
+
N
B
-
F
F
O
O
C
H
3
CH
3
Cl
Cl
H
ENOL (intra-HB) FORM
KETO FORM
inter-HB FORM
BASE
...
Cl
N
B
-
N
+
N
F
F
CH3
N
H
O
H
Cl
N
B
-
N
+
N
F
F
CH3
N
H
O
H
Cl
N
B
-
N
+
N
F
F
CH3
N
H
O
H
Base
Cl
N
B
-
N
+
N
F
F
CH3
N
H
O
H
Base
A
D
B
C
BODIPY-diketone dye
BODIPY-Schiff dye
Fig. 1. Chemical structures of studied BODIPY-diketone and BODIPY-Schiff dyes and a scheme of the
isomerization and tautomeric equilibrium.
Keywords: BODIPY; Schiff base; diketone
Acknowledgment
The work is supported by Wroclaw Centre of Biotechnology, programme The Leading National Research
Centre (KNOW-12) for years 2014-2018, and RFBR grant (No. 16-03-00405).
References
[1] A. Filarowski, M. Lopatkova, P. Lipkowski, M. Van der Auwerar, V. Leen, W. Dehaen.
Solvatochromism of BODIPY-Schiff base Dye. J. Phys. Chem. B, 119 (2015) 2576.
Dostları ilə paylaş: |