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Electronic Spectroscopy Laboratory (E S L):
Development of Photo-Functional Organic and Hybrid Complex Nanosystems
for Solar Exploitation, Lighting, Molecular Machinery and Smart Electronics
Dr. George Pistolis, Research Director
Division of Physical Chemistry
NCSR “Demokritos”
15310 Aghia Paraskevi, Attiki, Greece
Tel: +30 210 6503637
e-mail: pistolis"at"chem.demokritos.gr
Dr. George Pistolis is Researcher Director of the Electronic Spectroscopy Laboratory at the National Center for Scientific Research "Demokritos" in Aghia Paraskevi, Greece, the largest state-owned research organization in the country. He graduated from the National and Kapodistrian University of Athens, obtaining the Degree of Chemistry in 1986. After two years of military service (1986-1988) he entered the Graduate Programme of the University of Athens in collaboration with the Institute of Physical Chemistry (IPC) of the National Centre for Scientific Research "Demokritos" (N.S.C.R. "D"). He obtained his PhD in photochromic supramolecular materials in 1994. In 1995 he obtained a post-doctoral position at the Institute of Physical Chemistry (IPC), of N.S.C.R. "Demokritos" to work with Dr. A. Malliaris in the field of spectroscopy in organized molecular systems. He has been a frequent Visiting Scientist at the Institute of Synthetic Polymer Materials of Russian Academy of Sciences in Moscow during the period of 1999-2002. In addition to his research interests, he has worked as Assistant Professor in the Department of Materials Science of the University of Ioannina, Greece, for three years (2000-2003) teaching General Chemistry (class and lab) and Physical Chemistry. In 2003 he joined the Institute of Physical Chemistry (IPC), of N.S.C.R. "Demokritos" as a Researcher C. In 2006 he became Senior Researcher B and in 2011 he was promoted to Research Director.
Dr. George Pistolis leads a multidisciplinary research program devoted to the Molecular Engineering of Photo-functional Self-Assembled Nanosystems. More specifically his research focuses on the design, synthesis, characterization and in-depth spectroscopy of functional dyes and their programmable self-assembly into well-defined photo-(re)active nanoarchitectures with tailored properties for potential applications in lighting, solar energy conversion, electronics – photonics, molecular sensing and machinery.
Over the past decade and more, our group has been extensively studying various aspects of supramolecular architectures - spanning from simple inclusion compounds to complex self –assembled nanostructures - such as,
After obtaining a sufficient expertise on the aforementioned thematic areas, the new activities of our group focus on the design, supramolecular synthesis, characterization and comprehensive spectroscopy of cleverly engineered self-assembled complex nanoarchitectures capable of exploiting light for tuning and tailoring the properties of advanced materials. More specifically, we are interested in constructing intensely absorbing/emitting metallosupramolecular host nanoarchitectures with size-adjustable nanoporous cavities capable of accommodating a large variety of semiconducting materials. We further intend to achieve precise control over the spatial topology and the energy levels of the interacting dipoles in the above multichromophoric arrays and to provide new insights into beneficial pathways for harvesting, transferring, (up)-converting and funnelling electronic energy in the condensed phase for multifunctional applications including, accumulation and tuning in photo(electro)-luminescence, light-harvesting and solar energy conversion, organic electronics and photovoltaics, photomechanical responses and molecular sensing.
Host-guest self-assembled multichromophoric arrays
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Coordination–driven supramolecular synthesis of a rhomboid cavitand (12)2 - comprising two distinct BODIPY based dyes - and its inclusion complex with 4SPy via ionic self-assembly
Crystal structure of the inclusion complex 4SPyÌ(12)2
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The main methodologies and techniques involved in our research comprise:
· Design and synthesis of photomolecular building blocks and their subsequent directed supramolecular synthesis – via combinations of selected self-assembly protocols - into well-defined photo-functional nanoarchitectures. Verification of the structures is made by means of structural (multinuclear NMR & 2D NMR, ESI-MS, X-ray crystallography, SAXS, STM, AFM) and electronic/optical (UV/Vis/NIR absorption and fluorescence) characterization techniques.
· Electronic spectroscopy methods, both steady-state and time-resolved, to study photophysical and photochemical processes, such as kinetics and thermodynamics of energy/electron transfer phenomena – photomechanical conversions, rotational dynamics etc. We perform research on subnanosecond to millisecond time scales in NCSR Demokritos. Ultrafast measurements (femto-to-picoseconds) are investigated in collaboration with Dept. of Physics, University of Patras and with laboratories in Europe.
Selected Publication
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N. Karakostas, I. M. Mavridis, K. Seintis, M. Fakis, E. N. Koini, I. D. Petsalakis, G. Pistolis “Highly efficient and unidirectional energy transfer within a tightly self-assembled host–guest multichromophoric array”
Chem. Comm., 2013, DOI: 10.1039/C3CC48076C
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Kaloudi-Chantzea, N. Karakostas, F. Pitterl, C. P. Raptopoulou, N. Glezos, G. Pistolis “Efficient supramolecular synthesis of a robust circular light-harvesting Bodipy-dye based array”
Chem. Comm., 2012, 48, 12213–12215 pdf
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I. Balomenou, A. Kaloudi-Chantzea, N. Karakostas, K. Yannakopoulou, I. M. Mavridis and G. Pistolis “Controlled Stereospecificity of a Volume-Conserving Adiabatic Photoisomerization within a Nanotubular Self-Assembled Cage: Insights Into Machinery Behavior ”
J. Phys. Chem B 2011, 115, 10665-10681 pdf
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Kaloudi-Chantzea A, Karakostas N,. Raptopoulou C. P, Psycharis V, Saridakis E, Griebel J, Hermann R, Pistolis G. “Coordination-Driven Self Assembly of a Brilliantly Fluorescent Rhomboid Cavitand Composed of Bodipy-Dye Subunits”
J. Am. Chem. Soc., 2010, 132 , 16327-16329 pdf
For a highlight see '" Unquenched Fluorescent Metal Nanocages"T M Swager and D.B. Walker, Synfacts, 2, 0151 (2011)
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Balomenou I, Kaloudi-Chantzea A, Bokias G,. Kallitsis J. K, Raptopoulou C. P, Terzis A, and Pistolis G “Medium Effect on the Geometric Isomerism of a Centrosymmetrically Disubstituted Naphthalene Derivative with Flexible Methoxytriethylene Glycol Chains”
J. Phys. Chem.B , 2010, 114, 8181-8190 pdf
J. Phys. Chem.B, 2010, 114, 780-785 pdf
Chem. Eur. J., 2009, 15, 4228-4232 pdf
J. Am. Chem. Soc. 2007, 129, 13247-13253 pdf
Adv. Funct. Mat. 2007, 17, 3477-3485 pdf
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V. Vergadou, G. Pistolis , A. Michaelides, G. Varvounis, M. Siskos N. Boukos and S. Skoulika.“Self-organization of four symmetric tri-phenyl-benzene derivatives”
Crystal Growth & Design, 2006, 6, 2486-2492 pdf
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G. Pistolis and I. Balomenou. “Cyclodextrin Cavity Size Effect On the Complexation and Rotational Dynamics of the Laser dye 2,5- Diphenyl-1, 3,4-oxadiazole: From Singly-Occupied Complexes to their Nanotubular Self-Assemblies”
J. Phys. Chem. B, 2006, 110, 16428-16438 pdf
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G. Pistolis, A. K. Andreopoulou, A. Malliaris, and J. K. Kallitsis. “Direct observation of odd-even effect in dilute polymeric solutions: A time-resolved fluorescence anisotropy study”
J. Phys. Chem. B, 2005, 109, 11538-11543 pdf
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G. Pistolis, A. K. Andreopoulou, A. Malliaris, and J. K. Kallitsis. “Effect of the Chain Length on the Photonic Efficiency of Aromatic-Aliphatic Dendronized Polyethers”
Macromolecules, 2004, 37, 1524-1530 pdf
J. Phys. Chem. B, 2004, 108, 2846-2850 pdf
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