ENERGY TRANSFER IN MOLECULAR CRYSTALS AND IN DOUBLE MOLECULES

1958 ◽  
Vol 36 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Donald S. McClure
Keyword(s):  
Energy Transfer ◽  
Electronic Transition ◽  
Energy Exchange ◽  
Molecular Crystals ◽  
Electronic Energy ◽  
Exchange Parameter ◽  
Electronic Interaction ◽  
Similar Data ◽  
Intermediate Region

The theory of the transfer of electronic energy between two molecules, or between two parts of a "double molecule", is discussed for the case in which vibrational quanta are present. The results are obtained for two limiting cases of weak and strong electronic interaction. Some of the phenomena occurring in the intermediate region are discussed qualitatively. With the aid of these results the spectra of biphenyl, diphenylmethane, and dibenzyl have been analyzed, and the electronic energy exchange parameter has been determined for each. These data are compared with similar data on durene crystal and the paracyclophanes. The electronic energy exchange parameter is given approximately correctly by considering the interaction of electronic transition dipoles except for very close and for very distant molecules.

Meso-meso phenyl bridged unsymmetrical porphyrin dyads: synthesis, spectral, electrochemical and photophysical properties

2011 ◽  
Vol 15 (01) ◽  
pp. 83-98 ◽  
Author(s):  
Meesala Yedukondalu ◽  
Dilip K. Maity ◽  
Mangalampalli Ravikanth
Keyword(s):  
Energy Transfer ◽  
Energy Level ◽  
State Energy ◽  
Singlet State ◽  
Structural Information ◽  
Photophysical Properties ◽  
Electronic Energy ◽  
Electronic Interaction ◽  
Hybrid Functional ◽  
Donor And Acceptor

Seven phenyl bridged meso-meso unsymmetrical porphyrin dyads containing two different porphyrins either two types of heteroporphyrins or one porphyrin and one heteroporphyrin were synthesized by coupling of readily accessible appropriate mono-meso porphyrin boronate/heteroporphyrin boronate with meso-bromoheteroporphyrin in the presence of Cs2CO3/Pd(PPh}3)4 in toluene/DMF at 80°C for 4 h. The dyads are freely soluble in common organic solvents and were characterized by mass, NMR, absorption, electrochemical and fluorescence techniques. The NMR, absorption and electrochemical studies indicated that the two porphyrin sub-units in dyads interact weakly and they retain their characteristic features. In six out of seven dyads, the free-base porphyrin with N4 core or its Zn(II) derivative possess singlet state energy level at higher energy hence acts as energy donor and the heteroporphyrin sub-unit with N3S , N2SO and N2S2 cores having singlet state energy level at lower energy acts as energy acceptor. Our preliminary photophysical studies on six unsymmetrical porphyrin dyads indicated a possibility of energy transfer at singlet state from donor porphyrin sub-unit to acceptor porphyrin sub-unit on selective excitation of donor porphyrin sub-unit. To gain the structural information and to demonstrate possible electronic interaction between the donor and acceptor porphyrin sub-units, DFT calculations were carried out on dyads 1, 3 and 5 by adopting B3LYP hybrid functional with Gaussian atomic basis functions. The theoretical studies predicted a considerable modification of electronic energy levels in these dyads with the change of porphyrin core in acceptor sub-unit. Calculations also indicate most efficient donor → acceptor energy transfer in case of dyad 5 supporting the experimental results.

Adiabatic large polarons in anisotropic molecular crystals

2011 ◽  
Vol 35 (1) ◽  
pp. 15-27
Author(s):  
Zoran Ivić ◽  
Željko Pržulj
Keyword(s):  
Energy Transfer ◽  
Effective Mass ◽  
Molecular Crystals ◽  
Single Chain ◽  
Proper Understanding ◽  
One Dimensional ◽  
Interchain Coupling ◽  
Large Polaron ◽  
The One

Adiabatic large polarons in anisotropic molecular crystals We study the large polaron whose motion is confined to a single chain in a system composed of the collection of parallel molecular chains embedded in threedimensional lattice. It is found that the interchain coupling has a significant impact on the large polaron characteristics. In particular, its radius is quite larger while its effective mass is considerably lighter than that estimated within the one-dimensional models. We believe that our findings should be taken into account for the proper understanding of the possible role of large polarons in the charge and energy transfer in quasi-one-dimensional substances.

scholarly journals Damming an Electronic Energy Reservoir: Ion-regulated Electronic Energy Shuttling in a [2]Rotaxane

2021 ◽  
Author(s):  
Shilin Yu ◽  
Gediminas Jonusauskas ◽  
Jean-Luc Pozzo ◽  
Stephen Goldup ◽  
Vicente Martí Centelles ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Electronic Energy ◽  
Electronic Energy Transfer

We demonstrate the first example of bidirectional reversible electronic energy transfer (REET) between the mechanically bonded components of a rotaxane. Our prototypical system was designed such that photoexcitation of a...

Spectroscopic confirmation of reversible electronic energy transfer in methylglyoxal

1975 ◽  
Vol 63 (1) ◽  
pp. 593-594 ◽  
Author(s):  
R. L. Opila ◽  
R. A. Coveleskie ◽  
James T. Yardley
Keyword(s):  
Energy Transfer ◽  
Electronic Energy ◽  
Electronic Energy Transfer

Vibrational relaxation and electronic energy transfer ofN2aggregates in solid Xe matrices

1985 ◽  
Vol 31 (8) ◽  
pp. 4854-4865 ◽  
Author(s):  
H. Kühle ◽  
J. Bahrdt ◽  
R. Fröhling ◽  
N. Schwentner ◽  
H. Wilcke
Keyword(s):  
Energy Transfer ◽  
Vibrational Relaxation ◽  
Electronic Energy ◽  
Electronic Energy Transfer

Electronic energy transfer in beam pumped gas mixtures

1974 ◽  
Vol 10 (9) ◽  
pp. 752-752
Author(s):  
R. Hill ◽  
D. Eckstrom ◽  
R. Gutcheck ◽  
D. Huestis ◽  
D. Lorents ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Gas Mixtures ◽  
Electronic Energy ◽  
Electronic Energy Transfer
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