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1. Amplitude analysis of the D+ → π−π+π+ decay and measurement of the π−π+ S-wave amplitude

   https://doi.org/10.1007/JHEP06(2023)044  

   Aaij, R.; Abdelmotteleb, A. S.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; et al (June 2023, Journal of High Energy Physics)

   A bstract An amplitude analysis of the D + → π − π + π + decay is performed with a sample corresponding to 1.5 fb − 1 of integrated luminosity of pp collisions at a centre-of-mass energy $$ \sqrt{s} $$ s = 8 TeV collected by the LHCb detector in 2012. The sample contains approximately six hundred thousand candidates with a signal purity of 95%. The resonant structure is studied through a fit to the Dalitz plot where the π − π + S-wave amplitude is extracted as a function of π − π + mass, and spin-1 and spin-2 resonances are included coherently through an isobar model. The S-wave component is found to be dominant, followed by the ρ (770) 0 π + and f 2 (1270) π + components. A small contribution from the ω (782) → π − π + decay is seen for the first time in the D + → π − π + π + decay. 

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2. Structural insights into the π-π-π stacking mechanism and DNA-binding activity of the YEATS domain

   https://doi.org/10.1038/s41467-018-07072-6  

   Klein, Brianna J.; Vann, Kendra R.; Andrews, Forest H.; Wang, Wesley W.; Zhang, Jibo; Zhang, Yi; Beloglazkina, Anastasia A.; Mi, Wenyi; Li, Yuanyuan; Li, Haitao; et al (December 2018, Nature Communications)
3. Origin of the π–π Spacing Change upon Doping of Semiconducting Polymers

   https://doi.org/10.1021/acs.jpcc.8b10845  

   Liu, Wenlan; Müller, Lars; Ma, Shuangying; Barlow, Stephen; Marder, Seth R.; Kowalsky, Wolfgang; Köhn, Andreas; Lovrincic, Robert (November 2018, The Journal of Physical Chemistry C)
4. Tipping the Balance between S-π and O-π Interactions

   https://doi.org/10.1021/jacs.8b07617  

   Hwang, Jungwun; Li, Ping; Smith, Mark D.; Warden, Constance E.; Sirianni, Dominic A.; Vik, Erik C.; Maier, Josef M.; Yehl, Christopher J.; Sherrill, C. David; Shimizu, Ken D. (September 2018, Journal of the American Chemical Society)
5. Complementary, Cooperative Ditopic Halogen Bonding and Electron Donor-Acceptor π-π Complexation in the Formation of Cocrystals

   https://doi.org/10.3390/molecules27051527  

   Speetzen, Erin D.; Nwachukwu, Chideraa I.; Bowling, Nathan P.; Bosch, Eric (March 2022, Molecules)

   This study expands and combines concepts from two of our earlier studies. One study reported the complementary halogen bonding and π-π charge transfer complexation observed between isomeric electron rich 4-N,N-dimethylaminophenylethynylpyridines and the electron poor halogen bond donor, 1-(3,5-dinitrophenylethynyl)-2,3,5,6-tetrafluoro-4-iodobenzene while the second study elaborated the ditopic halogen bonding of activated pyrimidines. Leveraging our understanding on the combination of these non-covalent interactions, we describe cocrystallization featuring ditopic halogen bonding and π-stacking. Specifically, red cocrystals are formed between the ditopic electron poor halogen bond donor 1-(3,5-dinitrophenylethynyl)-2,4,6-triflouro-3,5-diiodobenzene and each of electron rich pyrimidines 2- and 5-(4-N,N-dimethyl-aminophenylethynyl)pyrimidine. The X-ray single crystal structures of these cocrystals are described in terms of halogen bonding and electron donor-acceptor π-complexation. Computations confirm that the donor-acceptor π-stacking interactions are consistently stronger than the halogen bonding interactions and that there is cooperativity between π-stacking and halogen bonding in the crystals. 

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