Paul et al.
Comparative Analysis to Explore the Suitability of a Short Chain Dyad in Its Pristine and Nanocomposite Forms
0
0
0
0
0
0
0
.006
.005
.004
.003
.002
.001
.000
presumed as a most suitable material out of the three
systems studied to building efficient light energy conver-
sion or storage device. Transient absorption decay mea-
surements further corroborate our views. Investigations are
underway to examine how the degree of surface coverage
of the dyad on gold nanoparticles affect its geometry or
conformational structure on photoexcitation.
Acknowledgments: Tapan Ganguly expresses his grat-
itude to the University grant commission (UGC),
New Delhi, India for awarding Emeritus Fellow-
ship and providing contingency grant for research
purpose (F.6-6/2014-15/EMERITUS-2014-15-GEN-3976).
0
.0000000
0.0000005
0.0000010
0.0000015
MB expresses her sincere gratitude to the DST-SERB
project (YSS/2015/000589), DST, Govt of India. We are
very much grateful to Professor Samir K. Pal of S. N. Bose
National Centre for Basic Sciences, Salt lake, Kolkata
for allowing us to use the picosecond resolved fluores-
cence lifetimes by using a commercially available time-
correlated single-photon counting (TCSPC) setup from
Edinburgh instruments. We are also thankful to his stu-
dent Dr. Priya Singh for helping in the measurements of
picosecond lifetimes by using this TCSPC instrument.
time in s
0
0
0
0
0
0
0
.006
.005
.004
.003
.002
.001
.000
References and Notes
1. S. Fukuzumi, K. Ohkubo, H. Imahori, J. Shao, Z. Ou, G. Zheng,
Y. Chen, R. K. Pandey, M. Fujitsuka, O. Ito, and K. M. Kadish,
IP: 91.216.3.107 On: Fri, 11 Jan 2019 02:46:23
J. Am. Chem. Chem. Soc. 123, 10676 (2001).
0
.000000 0.000002 0.000004 0.000006 0.000008 0.000010
Copyright: American Scientific Publishers
2
. S. Bhattacharya, T. K. Pradhan, A. De, S. Roy Chowdhury, A. K.
De, and T. Ganguly, J. Phys. Chem. A 110, 5665 (2006).
time in s
Delivered by Ingenta
3
. G. Zaragoza-Galán, J. Ortíz-Palacios, B. X. Valderrama, A. A.
Camacho-Dávila, D. Chávez-Flores, V. H. Ramos-Sánchez, and
E. Rivera, Molecules 19, 352 (2014).
Figure 7. (upper) The transient absorption decay of the pristine dyad
2
at 540 nm (anionic acceptor fluorene) (r ∼ 0ꢂ98) (lower). The transient
absorption decay of the nanocomposite system of dyad-GNS at 540 nm
2
4. E. Allard, J. Cousseau, J. Ordúna, J. Garín, H. Luo, Y. Araki, and
O. Ito, Phys. Chem. Chem. Phys. 4, 5944 (2002).
(
r ∼ 0ꢂ99) corresponding to anionic species of acceptor fluorene.
5
. G. Dutta (Pal), P. Chakraborty, S. Yadav, A. De, M. Bardhan,
P. Kumbhakar, S. Biswas, H. S. DeSarkar, and T. Ganguly,
J. Nanosci. Nanotechnol. 16, 7411 (2016).
However, further investigations are underway to examine
quantitavely how the degree of surface coverage of the
dyad on gold nanoparticles affect its geometry or confor-
mational changes.
6. G. Pal, A. Paul, S. Yadav, M. Bardhan, A. De, J. Chowdhury,
A. Jana, and T. Ganguly, J. Nanosci. Nanotechnol. 15, 5775 (2015).
7
8
9
. G. Dutta (Pal), S. Paul, M. Bardhan, A. De, and T. Ganguly, Spec-
trochimica Acta Part A 180, 168 (2017).
. K. K. Park, H. Jung, T. Lee, and S. K. Kang, Bull Korean Chem.
Soc. 31, 984 (2010).
. M. Bardhan, B. Satpati, T. Ghosh, and D. Senapati, J. Mater. Chem.
C 2, 3795 (2014).
4
. CONCLUSIONS
Steady state and time resolved spectroscopic investigations
on the pristine dyad and the nanocomposites where the
dyad combines with gold nanoparticles of two different
morphologies: spherical and star shaped demonstrate that
nanocomposite systems appear to be better light energy
conversion device than the pristine dyad. This occurs as
the photoconversion of trans-(stable in the ground state)
to the cis-form on photoexcitation hinders to some extent
in nanocomposites and majority of ground trans-isomer
retains its configuration even in the excited state. As within
the three systems studied in the present investigation larger
amount of ground trans structures retain on photoexci-
tation in case of dyad-GNS system, this one could be
10. G. Dutta (Pal), S. Paul, M. Bardhan, and T. Ganguly, J. Nanosci.
Nanotechnol. 18, 2943 (2018).
11. A. D. Backe, J. Chem. Phys. 98, 5648 (1993).
12. C. Lee, W. Yang, and G. Parr, Phys. Rev. B 37, 785 (1988).
13. N. J. Heada, J. Thomasa, M. J. Shepharda, M. N. Paddon-Row, T. D.
M. Bell, N. M. Cabral, and K. P. Ghiggino, J. Photochem Photobiol.
A: Chemistry 133, 105 (2000).
14. T. Ganguly, D. K. Sharma, S. Gauthier, D. Gravel, and G. Durocher,
J. Phys. Chem. 96, 3757 (1992).
1
1
5. K. Nakamura, J. Am. Chem. Soc. 102, 7846 (1980).
6. S. Stolnik, B. Daudali, A. Arien, J. Whetstone, C. R. Heald, M. C.
Garnett, S. S. Davis, and L. Illum, Biochimica et Biophysica Acta
1514, 261 (2001).
Received: 6 September 2017. Accepted: 9 January 2018.
J. Nanosci. Nanotechnol. 18, 7873–7881, 2018
7881