A unique trimeric triphenylene radical cation: stacking aggregation, bonding, and stability.

A new and unique π-stacking triphenylene trimer cation radical unit appears in the crystal structure of a newly synthesized salt with an oligomeric gallium(iii) chloride, [(CH)]˙(GaCl), which is the first triphenylene aggregate observed. The structure is attributed to a shared electron distributed over the trimer displaying π-stacking pancake bonding. Computational modeling rationalizes the appearance of a "chain-shaped" rather than a "star-shaped" gallium chloride anion as well as the reasons why the trimer, rather than a radical cation aggregate of different size, is preferred in this system.

Structure and Bonding in π-Stacked Perylenes: The Impact of Charge on Pancake Bonding.

Perylene (PER) is a prototype of polycyclic aromatic hydrocarbons (PAHs), which play a pivotal role in various functional and electronic materials due to favorable molecule-to-molecule overlaps, which enhance electronic transport. This study provides guidelines regarding the impact of molecular charge on pancake bonding, a form of strong π-stacking interaction. Pancake bonding significantly boosts interaction energies within the monopositive dimer ([(CH)] or PER), crucial for stabilizing aggregation and crystal formation.

Experiences of people living with Parkinson's disease and key stakeholders in dance-based programs: a systematic review and meta-ethnography.

Purpose: To identify and synthesize qualitative literature on the experiences of participants and key stakeholders in dance programs for people living with Parkinson's disease. Synthesizing the available literature can generate new insights into participant experience to inform current and future programs.

Materials And Methods: Qualitative and mixed methods studies were identified via a systematic search of six databases: CINAHL, Web of Science, Scopus, SPORTDiscus, PsycInfo, and MEDLINE.

Evidence for the Predator Attraction Hypothesis in an amphibian predator-prey system.

Many species possess damage-released chemical alarm cues that function in alerting nearby individuals to a predator attack. One hypothesis for the evolution and/or maintenance of such cues is the Predator Attraction Hypothesis, where predators, rather than prey, are the "intended" recipients of these cues. If a predator attack attracts additional predators, these secondary predators might interfere with the predation event, providing the prey with a better chance to escape.