XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
279
T4: P–12
Ultrastable, water-dispersible and biocompatible luminescent Silicon
quantum dots modified Histidine graphene quantum dots as novel
biological carrier for target drug delivery
Tayyebeh Madrakian
1
, Hediyeh Mahmood Kashani
1
, and Abbas Afkhami
1
1
Faculty of Chemistry, Bu-Ali Sina University, Hamedan 6517838695, Iran,
e-mail: madrakian@gmail.com
We develop silicon quantum dots modified histidine graphene quantum dots as novel
biological carrier for target drug delivery. To effectively treat this aggressive tumor, a multi-
target receptor tyrosine kinase inhibitor, sunitinib base, was efficiently loaded on nano-delivery
system. The purpose of this study was to prepare silicon quantum dots modified histidine
graphene quantum dots (Si-QDs @His-GQDs) as a novel carrier for selective intracellular
delivery of Sunitinib. In our study, a pH-sensitive drug delivery system consisted of Si-QDs
@His-GQDs have been successfully synthesized as the drug carriers. Because of the synthesis
of carrier under neutral conditions, Si-QDs @His-GQDs show the pH-sensitive load and release
performance based on the slight difference between tumor (weakly acid) and normal tissue
(weakly alkaline). And before reaching tumor site, the drug delivery system shows good drug
retention. The excellent biocompatibility and selective release performance of the carrier, is
expected to be promising in the potential application of cancer treatment.
Fig. 1. Synthesis procedure of silicon quantum dot.
Keywords: silicon quantum dots modified histidine graphene quantum dots; sunitinib; drug delivery
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
280
T4: P–13
Construction of a novel "Off-On" fluorescence sensor for highly
selective sensing of selenite based on europium ions induced
crosslinking of nitrogen doped carbon dots
Abbas Afkhami
1
, Niloufar Amin
1
, and Tayyebeh Madrakian
1
1
Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran, e-mail: abbas.afkhami@gmail.com
A highly blue luminescent nitrogen doped carbon dots (N-CDs) was prepared using citric
acid and l-lysine via one pot hydrothermal treatment. The method is based on the competition
between selenite oxyanion with carboxylate and hydroxyl groups on the surface of N-carbon
dots for europium ions binding. N-CDs could be readily quenched upon addition of europium
ions owing to high affinity of carboxylate and hydroxyl groups at the surface of carbon dots to
Eu3+ leading to aggregation of N-CDs (state OFF). After selenite addition, disruption of the
aggregated N-CDs takes place, leading to restoration of the quenched fluorescence (State ON).
The repeatability was less than 3.2% for selenite in both standard and real samples (n=3). The
method provides a simple procedure enabled selective detection of selenite in the presence of 12
other coexisting anions with a linear range of 0.078 to 21.4 µg mL
−1
and a limit of detection of
53.0 ng mL
−1
(S/N=3). The accuracy and precision were evaluated based on the detection of
selenite in health care products with satisfactory results. Compared with other conventional
techniques, the Eu
3+
-adjusted N-CDs "OFF-ON" fluorescent probe is highly selective, rapid,
operating simplicity, eco-friendly, and low cost for selenite determination.
Keywords: europium ions; selenite; nitrogen doped carbon dots; off-on probe.
XIV
h
International Conference on Molecular Spectroscopy, Białka Tatrzańska 2017
281
T5: P–1
Irregularities in the E
1
Π, υ=0 level of the AlH and AlD isotopologues:
deperturbation analysis on AlD
Wojciech Szajna
1
, Rafał Hakalla
1
, Mirosław Zachwieja
1
, Izabela Piotrowska
1
,
Małgorzata Ostrowska-Kopeć
1
, Przemysław Kolek
1
, and Ryszard Kępa
1
1
Materials Spectroscopy Laboratory, Department of Experimental Physics, Faculty of Mathematics
and Natural Science, University of Rzeszów, Pigonia 1 Street, 35-959 Rzeszów, Poland,
e-mail: szajna@ur.edu.pl
The irregularities in the E1Π, υ=0 level of AlH and AlD have been studied on the basis of
the emission spectrum of the E
1
Π – A
1
Π system of AlH (current investigations) and E
1
Π – A
1
Π,
E
1
Π – X
1
Ʃ
+
, G
1
Ʃ
+
– A
1
Π, G
1
Ʃ
+
– X
1
Ʃ
+
systems of AlD [1].
The AlH spectrum (see Fig. 1.) was observed under high resolution by using high accuracy
dispersive optical spectroscopy. In total, 56 line positions have been measured with precision of
approximately 0.003 cm-1. Due to the predissociation, the highest observed rotational level in
the E
1
Π, υ = 0 level is equals 12. The f-component is regular while, the e-component is widely
affected by significant rotational perturbations. The perturbations are believed to arise from
interaction of the E
1
Π state with the higher lying G
1
Ʃ
+
state. This interaction causes anomalous
Λ-doubling in the E
1
Π, υ = 0 level. The new data were elaborated with the help of the recent
A
1
Π state parameters reported by Szajna et al. [2]. Main molecular constants for the f-
component of the E
1
Π, υ = 0 level are: B
0
= 5.621720(66) cm
–1
and D
0
= 9.9925(43) × 10
–4
cm
–1
.
Fig. 1. Expanded portion of the 0 – 0 band of the E
1
Π
– A
1
Π
system of AlH near the R-branch heads.
The early AlD data [1] have been elaborated using Pgopher software [3] and experimental
data of the A
1
Π and X
1
Ʃ
+
states [3]. In total, 101 transitions from four bands of AlD were used
in the procedure of disentangling E
1
Π from the G
1
Ʃ
+
state. The first deperturbation procedure
results in 9 deperturbed molecular parameters for the E
1
Π and G
1
Ʃ
+
states, as well as in the
interaction parameter for the L-uncoupling perturbation ξ = -2.667(15) cm
–1
. The absolute
position of the AlD, G
1
Ʃ
+
, υ = 0 level has been determined for the first as 53054.009( 68) cm
–1
which is about only 29 cm-1 below the E1Π, υ = 0 level. First deperturbed molecular constants
( in cm
–1
) for the E
1
Π and G
1
Ʃ
+
states are presented below.
Constant
E
1
Π, υ = 0
G
1
Σ
+
, υ = 0
B
υ
D
υ
x 10
-4
H
υ
x 10
-7
q
υ
3.1830(15)
2.663(83)
-0.38(17)
0.3851(23)
3.0242(41)
3.23(23)
1.95(52)
Keywords: AlH and AlD isotopologues, perturbation analysis, deperturbed molecular constants
References
[1] A. Lagerqvist, L. E. Lundh, H. Neuhaus, Phys. Scripta. 1 (1970) 261.
[2] W. Szajna, M. Zachwieja, R. Hakalla, R. Kępa, Acta Phys. Pol. A. 120 (2011) 417.
[3] C.M. Western, J Quant. Spectrosc. Radiat Transf. 186 (2017) 221.
[4] W. Szajna, K. Moore, I. C. Lane, J Quant. Spectrosc. Radiat Transf. 196 (2017) 103.
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