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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. 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)
4. 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)
5. π-Face strapped monomers enable self-stabilized hyperbranched π-conjugated polymer particles

   https://doi.org/10.1039/D3PY01158E  

   Mohanan, Manikandan; Zhang, Xinran; Gavvalapalli, Nagarjuna (January 2024, Polymer Chemistry)

   π-Conjugated polymers that extend the π-conjugation in more than one dimension are highly sought after for various organic electronic and energy applications. However, the synthesis of solution processable higher dimensional π-conjugated materials is still at its infancy because of strong interchain π–π interactions. The conventional strategy of using linear alkyl pendant chains does not help overcome the strong interchain π–π interactions in higher dimensional π-conjugated materials as they do not directly mask the π-face of the repeat units. While the miniemulsion technique has been employed to generate hyperbranched π-conjugated polymer particles stabilized by surfactants, this approach does not address the molecular level challenges. We have proposed that π-face masking straps mask the π-face of the polymer backbone and therefore help to control π–π interchain interactions in higher dimensional π-conjugated materials at the molecular level. Herein, we have shown that when a strapped aryl dialdehyde monomer (A2) is reacted with a trifunctional 1,3,5-benzenetriamine (B3) using dynamic imine chemistry, a solution dispersible and processable hyperbranched polymer with a degree of branching of 0.46 is generated. Also, by varying the reaction conditions (catalyst, monomer concentration, and solvent), solution dispersible polymer particles of varying diameters ranging from 60 to 300 nm are generated. It is worth noting that despite having the suitable monomer architectures for the formation of ordered frameworks, a hyperbranched polymer is generated because the straps effectively hinder interlayer π–π stacking interactions, thereby preventing the formation of crystalline aggregates that are required for the growth of the former. Since straps stabilize the chains against π–π interactions at the molecular level, they will not only provide synthetic control over the architecture but also remove typical synthetic limitations associated with the miniemulsion technique including functional group intolerance and monomer miscibility. 

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