Ligand Triplet Energy Escape in Lanthanide Complexes for Developing Luminescent Molecular Thermometers

Ligand Triplet Energy Escape in Lanthanide Complexes for Developing Luminescent Molecular Thermometers | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Ligand Triplet Energy Escape in Lanthanide Complexes for Developing Luminescent Molecular Thermometers Yuichi Kitagawa, Yusaku Yamaguchi, Takuma Nakai, Shun Omagari, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6678504/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 01 Sep, 2025 Read the published version in Communications Chemistry → Version 1 posted You are reading this latest preprint version Abstract Luminescent lanthanide complexes exhibit temperature-sensitive metal-centered emission due to energy transfer quenching from the lanthanide to the ligand triplet states, which have been promising application in emission lifetime-based thermometers. However, the long-lived ligand triplet state limits the temperature sensitivity of lanthanide emission. This study demonstrates an enhancement in the temperature sensitivity of Tb(III) emission by introducing an energy escape pathway from the ligand triplet state. A dinuclear Tb(III)–Nd(III) complex containing hexafluoroacetylacetonate (hfa) and triphenylene bridging ligands was prepared, which exhibits temperature-dependent energy transfer from the Tb(III)-emitting state to the hfa triplet state. The triplet level of the hfa ligand is similar to that of the triphenylene ligand, inducing effective energy transfer from hfa to Nd(III) via the triphenylene ligands. This energy transfer pathway provides a short-lived excited state of hfa ligands, resulting in the highest temperature sensitivity (4.4% K − 1 ) among emission lifetime-based thermometers of lanthanide complexes. Physical sciences/Chemistry/Photochemistry Physical sciences/Chemistry/Inorganic chemistry Full Text Additional Declarations There is NO Competing Interest. Supplementary Files checkcif.pdf Checkcif Table1.pdf Table 1 Table2.pdf Table 2 SIfinal.pdf Supplemental Material 2446137.cif cif file Cite Share Download PDF Status: Published Journal Publication published 01 Sep, 2025 Read the published version in Communications Chemistry → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6678504","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":463552698,"identity":"deeafb3e-c87f-40be-8f6b-d89b2d835465","order_by":0,"name":"Yuichi 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