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The development of innovative triplet materials plays a significant role in various applications. Although effective tuning of triplet formation by intersystem crossing (ISC) has been well established in solution, the modulation of ISC processes in the solid state remains a challenge due to the presence of other exciton decay channels through intermolecular interactions. The cyclic structure of cycloparaphenylenes (CPPs) offers a unique platform to tune the intermolecular packing, which leads to controllable exciton dynamics in the solid state. Herein, by integrating an electron deficient coronene diimide (CDI) unit into the CPP framework, a donor‐acceptor type of conjugated macrocycle (CDI‐CPP) featuring intramolecular charge‐transfer (CT) interaction was designed and synthesized. Effective intermolecular CT interaction resulting from a slipped herringbone packing was confirmed by X‐ray crystallography. Transient spectroscopy studies showed that CDI‐CPP undergoes ISC in both solution and the film state, with triplet generation time constants of 4.5 ns and 238 ps, respectively. The rapid triplet formation through ISC in the film state can be ascribed to the cooperation between intra‐ and intermolecular charge‐transfer interactions. Our results highlight that intermolecular CT interaction has a pronounced effect on the ISC process in the solid state, and shed light on the use of the characteristic structure of CPPs to manipulate intermolecular CT interactions. [ABSTRACT FROM AUTHOR]

Background: Despite the benefits of physical activity, children’s compliance with physical activity recommendations is very low and this situation worsened during the COVID-19 pandemic. Physical literacy has been theorised as a factor that can enhance and sustain children’s engagement with physical activity. This study aimed to investigate whether physical literacy is associated with children’s adherence to the physical activity guidelines during COVID-19.Methods: Data for this cross-sectional study were collected from 648 Australian children (60% boys) aged 7–12 years (M = 10 years; SD = 1.7) and their parents/carers. Recruitment was conducted through social media and panel sampling. Self-perceived physical literacy was measured using the pictorial Physical Literacy in Children Questionnaire. Children’s adherence to physical activity guidelines was collected using a two-item questionnaire asking parents/guardians about the number of days their children were active for at least 60 min in a typical week before and during COVID-19. The association between physical literacy (predictor) and physical activity (binary outcome: meeting/not meeting guidelines before/during COVID-19) was tested with logistic regressions while adjusting for relevant confounders.Results: Most parents spoke English at home (91%), over half had a university education (62%) and three quarters had paid employment (75%). Children’s physical literacy scores ranged from 32–120 (M = 94; SD = 16). Physical literacy overall score was associated with significantly higher odds of meeting the physical activity recommendations during COVID-19 (OR = 1.03, 95% CI [1.02; 1.05]). Each of the physical literacy subdomains (i.e. physical, psychological, social, cognitive) was also significantly associated with children’s adherence to the physical activity guidelines (ORs = 1.07–1.22).Conclusions: These findings indicate that physical literacy is a predictor of physical activity and may act as a protective factor of such behaviour during limiting events, such as the COVID-19 pandemic. Further research could confirm this relationship using objective measures of physical activity and exploring whether interventions designed to improve physical literacy can benefit physical activity. [ABSTRACT FROM AUTHOR]

Singlet fission (SF) is a spin–allowed process in which a higher–energy singlet exciton is converted into two lower‐energy triplet excitons via a triplet pair intermediate state. Implementing SF in photovoltaic devices holds the potential to exceed the Shockley–Queisser limit of conventional single‐junction solar cells. Although great progress has been made in exploiting the underlying mechanism of SF over the past decades, the scope of materials capable of SF, particularly polymeric materials, remains poor. SF–capable polymer is one of the most potential candidates in the implementation of SF into devices due to their distinct superiorities in flexibility, solution processability and self‐assembly behavior. Notably, recent advancements have demonstrated high‐performance SF in isolated donor‐acceptor (D‐A) copolymer chains. This review provides an overview of recent progress in the development of SF‐capable polymeric materials, with a significant focus on elucidating the mechanisms of SF in polymers and optimizing the design strategies for SF‐capable polymers. Additionally, the paper discusses the challenges encountered in this field and presents future perspectives. It is expected that this comprehensive review will offer valuable insights into the design of novel SF‐capable polymeric materials, further advancing the potential for SF implementation in photovoltaic devices. [ABSTRACT FROM AUTHOR]

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