Controlled energy transfer between isolated donor-acceptor molecules intercalated in thermally self-ensemble two-dimensional hydrogen bonding cages

2012 ◽  
Vol 86 (23) ◽  
Author(s):  
Hameed A. Al Attar ◽  
Andrew P. Monkman
Keyword(s):  
Hydrogen Bonding ◽  
Energy Transfer ◽  
Two Dimensional ◽  
Donor Acceptor ◽  
Acceptor Molecules

Implementation of a Hamiliton-Receptor-Based Hydrogen-Bonding Motif toward a New Electron Donor−Acceptor Prototype:  Electron versus Energy Transfer

2007 ◽  
Vol 129 (51) ◽  
pp. 16057-16071 ◽  
Author(s):  
Florian Wessendorf ◽  
Jan-Frederik Gnichwitz ◽  
Ginka H. Sarova ◽  
Kristine Hager ◽  
Uwe Hartnagel ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Energy Transfer ◽  
Electron Donor ◽  
Donor Acceptor

Influence of the Reversible Energy Transfer on the Donor Fluorescence Quantum Yieldin Donor-Acceptor Systems

1984 ◽  
Vol 39 (10) ◽  
pp. 948-951 ◽  
Author(s):  
C. Bojarski
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Nonradiative Energy Transfer ◽  
Acceptor Concentration ◽  
Donor And Acceptor ◽  
Donor Acceptor ◽  
Mixed Systems ◽  
High Donor ◽  
Concentration Ratios ◽  
Acceptor Molecules

Abstract In mixed systems of donor and acceptor molecules having closely located S1 levels a reversible nonradiative energy transfer should occur. It influences remarkably the dependence of the donor quantum yield ηD on the acceptor concentration in the range of high acceptor concentrations of systems with high donor-to-acceptor reduced concentration ratios.

Three new pseudopolymorphs of 6-aminouracil

2013 ◽  
Vol 69 (11) ◽  
pp. 1402-1407
Author(s):  
Valeska Gerhardt ◽  
Michael Bolte
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Two Dimensional ◽  
Donor Acceptor ◽  
Solvent Molecules ◽  
Bonding Patterns

Since 6-aminouracil derivatives show diversified use in various fields of application, we crystallized 6-aminouracil to examine its preferred hydrogen-bonding frameworks. 6-Aminouracil shows two rigid hydrogen-bonding sites,viz.one acceptor–donor–acceptor (ADA) site and one donor–donor–acceptor (DDA) site. During various crystallization attempts, we obtained three structures, namely two dimethylacetamide monosolvates, C4H5N3O2·C4H9NO, and a 1-methylpyrrolidin-2-one monosolvate, C4H5N3O2·C5H9NO. In all three structures,R21(6) N—H...O hydrogen-bonding patterns link the molecules to their respective solvent molecules. The formation ofR22(8) N—H...O hydrogen-bond motifs between 6-aminouracil molecules can only be found in two-dimensional frameworks, whereasR33(14) N—H...O patterns are present when zigzag chzins of 6-aminouracil molecules are formed.

Cascade energy transfer and tunable emission from nanosheet hybrids: locating acceptor molecules through chiral doping

2017 ◽  
Vol 53 (52) ◽  
pp. 7072-7075 ◽  
Author(s):  
Goudappagouda Goudappagouda ◽  
Vivek Chandrakant Wakchaure ◽  
Kayaramkodath Chandran Ranjeesh ◽  
Chalona Antony Ralph Abhai ◽  
Sukumaran Santhosh Babu
Keyword(s):  
Energy Transfer ◽  
Intramolecular Energy Transfer ◽  
Acceptor Doping ◽  
Chiral Induction ◽  
Cascade Energy ◽  
Donor Acceptor ◽  
Tunable Emission ◽  
Acceptor Molecules

A donor–acceptor–donor triad with excellent intramolecular energy transfer (99%) exhibits cascade energy transfer in the presence of second acceptors leading to tunable emission colours. Chiral acceptor doping enables chiral induction and to locate acceptors in the donor scaffold.

Cocrystals of 6-methyl-2-thiouracil: presence of the acceptor–donor–acceptor/donor–acceptor–donor synthon

2015 ◽  
Vol 71 (3) ◽  
pp. 229-238 ◽  
Author(s):  
Wilhelm Maximilian Hützler ◽  
Ernst Egert
Keyword(s):  
Hydrogen Bonding ◽  
Antithyroid Drug ◽  
Two Dimensional ◽  
Orientational Disorder ◽  
One Dimensional ◽  
Donor Acceptor ◽  
Hydrogen Bonding Network ◽  
Hydrogen Bonding Site ◽  
Uracil Base ◽  
Bonding Site

The results of seven cocrystallization experiments of the antithyroid drug 6-methyl-2-thiouracil (MTU), C5H6N2OS, with 2,4-diaminopyrimidine, 2,4,6-triaminopyrimidine and 6-amino-3H-isocytosine (viz.2,6-diamino-3H-pyrimidin-4-one) are reported. MTU features anADA(A= acceptor andD= donor) hydrogen-bonding site, while the three coformers show complementaryDADhydrogen-bonding sites and therefore should be capable of forming anADA/DADN—H...O/N—H...N/N—H...S synthon with MTU. The experiments yielded one cocrystal and six cocrystal solvates, namely 6-methyl-2-thiouracil–2,4-diaminopyrimidine–1-methylpyrrolidin-2-one (1/1/2), C5H6N2OS·C4H6N4·2C5H9NO, (I), 6-methyl-2-thiouracil–2,4-diaminopyrimidine (1/1), C5H6N2OS·C4H6N4, (II), 6-methyl-2-thiouracil–2,4-diaminopyrimidine–N,N-dimethylacetamide (2/1/2), 2C5H6N2OS·C4H6N4·2C4H9NO, (III), 6-methyl-2-thiouracil–2,4-diaminopyrimidine–N,N-dimethylformamide (2/1/2), C5H6N2OS·0.5C4H6N4·C3H7NO, (IV), 2,4,6-triaminopyrimidinium 6-methyl-2-thiouracilate–6-methyl-2-thiouracil–N,N-dimethylformamide (1/1/2), C4H8N5+·C5H5N2OS−·C5H6N2OS·2C3H7NO, (V), 6-methyl-2-thiouracil–6-amino-3H-isocytosine–N,N-dimethylformamide (1/1/1), C5H6N2OS·C4H6N4O·C3H7NO, (VI), and 6-methyl-2-thiouracil–6-amino-3H-isocytosine–dimethyl sulfoxide (1/1/1), C5H6N2OS·C4H6N4O·C2H6OS, (VII). Whereas in cocrystal (I) anR22(8) interaction similar to the Watson–Crick adenine/uracil base pair is formed and a two-dimensional hydrogen-bonding network is observed, the cocrystals (II)–(VII) contain the triply hydrogen-bondedADA/DADN—H...O/N—H...N/N—H...S synthon and show a one-dimensional hydrogen-bonding network. Although 2,4-diaminopyrimidine possesses only oneDADhydrogen-bonding site, it is, due to orientational disorder, triply connected to two MTU molecules in (III) and (IV).

Intramolecular Triplet Energy Transfer in Donor–Acceptor Molecules Linked by a Crown Ether Bridge

2006 ◽  
Vol 12 (20) ◽  
pp. 5238-5245 ◽  
Author(s):  
Xiao-He Xu ◽  
Xiao-Gang Fu ◽  
Li-Zhu Wu ◽  
Bin Chen ◽  
Li-Ping Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Crown Ether ◽  
Triplet Energy ◽  
Ether Bridge ◽  
Donor Acceptor ◽  
Triplet Energy Transfer ◽  
Acceptor Molecules

scholarly journals Star-shaped fluorene–BODIPY oligomers: versatile donor–acceptor systems for luminescent solar concentrators

2017 ◽  
Vol 5 (8) ◽  
pp. 1952-1962 ◽  
Author(s):  
Nathaniel J. L. K. Davis ◽  
Rowan W. MacQueen ◽  
Saul T. E. Jones ◽  
Clara Orofino-Pena ◽  
Diego Cortizo-Lacalle ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Concentrators ◽  
Luminescent Solar Concentrators ◽  
Donor Acceptor ◽  
Acceptor Molecules

Energy transfer in star-shaped donor–acceptor molecules reduces self-absorption in luminescent solar concentrators.

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