{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T11:18:45Z","timestamp":1788434325204,"version":"build-2803163510"},"reference-count":39,"publisher":"American Chemical Society (ACS)","issue":"34","license":[{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"},{"start":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T00:00:00Z","timestamp":1787184000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-045"}],"funder":[{"DOI":"10.13039\/100007567","name":"City University of Hong Kong","doi-asserted-by":"publisher","award":["6953015"],"award-info":[{"award-number":["6953015"]}],"id":[{"id":"10.13039\/100007567","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003452","name":"Innovation and Technology Commission","doi-asserted-by":"publisher","award":["MHP\/104\/21"],"award-info":[{"award-number":["MHP\/104\/21"]}],"id":[{"id":"10.13039\/501100003452","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Near-infrared (NIR) electrogenerated chemiluminescence (ECL) offers superior tissue penetration and reduced background for bioimaging, yet stable, efficient NIR luminophores remain rare. This study investigates the photophysical dynamics and ECL mechanisms of two donor\u2013acceptor\u2013donor platinum\u2013acetylide oligomers, Pt2DTB and Pt2BTDEDOT. Using femtosecond transient absorption spectroscopy, we identify an ultrafast intersystem crossing process (\u03c4ISC \u2248 0.5\u20131.2 ps) driven by strong spin\u2013orbit coupling, which establishes a robust triplet reservoir. Temperature-dependent TRPL and oxygen-quenching measurements support a triplet-mediated delayed-emission channel, while density functional theory calculations reveal large singlet\u2013triplet energy gaps, \u0394EST &amp;gt; 0.6 eV, that disfavor efficient TADF. These observations are consistent with a Singlet-Initiated ISC\u2013Triplet pathway involving Triplet\u2013Triplet Annihilation (SIT\u2013TTA). While electrochemical analysis shows that the radical anions of these oligomers are unstable, leading to weak annihilation ECL, the use of tripropylamine (TPrA) as a coreactant bypasses this instability, enhancing ECL intensity by 2\u20133 orders of magnitude. The resulting emission is significantly red-shifted, indicating a stabilized lower-energy emissive manifold. These findings provide critical design principles for organometallic NIR emitters, demonstrating that coreactant strategies are essential for leveraging triplet reservoirs in high-sensitivity optoelectronics.<\/jats:p>","DOI":"10.1021\/acs.analchem.6c03420","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T13:02:04Z","timestamp":1787230924000},"page":"25233-25242","source":"Crossref","is-referenced-by-count":0,"title":["Triplet Reservoir\nDynamics and Near-Infrared Electrochemiluminescence\nof Platinum\u2013Acetylide Oligomers"],"prefix":"10.1021","volume":"98","author":[{"given":"Chun Hong","family":"Mak","sequence":"first","affiliation":[{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]},{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5223-1352","authenticated-orcid":true,"given":"Yaojia","family":"Ai","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Jinan, China, 250100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Xu","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dingqin","family":"Hu","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liangliang","family":"Yue","sequence":"additional","affiliation":[{"name":"The Hong Kong Polytechnic University Hung Hom , , , ,","place":["Kowloon, Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7929-6964","authenticated-orcid":true,"given":"Xunjin","family":"Zhu","sequence":"additional","affiliation":[{"name":"The Hong Kong Polytechnic University Hung Hom , , , ,","place":["Kowloon, Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6850-2857","authenticated-orcid":true,"given":"Fang-Fang","family":"Li","sequence":"additional","affiliation":[{"name":"Huazhong University of Science and Technology , , 1037 Luoyu Road , ,","place":["Wuhan, China, 430074"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0662-782X","authenticated-orcid":true,"given":"Jiun-Tai","family":"Chen","sequence":"additional","affiliation":[{"name":"National Yang Ming Chiao Tung University , , ,","place":["HsinChu, Taiwan, 300093"]},{"name":"National Yang Ming Chiao Tung University , , ,","place":["Hsinchu, Taiwan, 300093"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4263-2175","authenticated-orcid":true,"given":"Chunyan","family":"Tan","sequence":"additional","affiliation":[{"name":"Tsinghua University , , ,","place":["Shenzhen, P. R. China, 518055"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3295-3848","authenticated-orcid":true,"given":"Guizheng","family":"Zou","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Jinan, China, 250100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Duu-Jong","family":"Lee","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5931-271X","authenticated-orcid":true,"given":"Hsien-Yi","family":"Hsu","sequence":"additional","affiliation":[{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]},{"name":"City University of Hong Kong , , Kowloon Tong, ,","place":["Hong Kong, China, 999077"]},{"name":"Shenzhen Research Institute of City University of Hong Kong , ,","place":["Shenzhen, China, 518057"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,20]]},"reference":[{"issue":"20","key":"2026090306454544500_cit1","doi-asserted-by":"publisher","first-page":"4126","DOI":"10.1021\/ac9704570","article-title":"Electrogenerated\nchemiluminescence. 61. Near-IR electrogenerated chemiluminescence,\nelectrochemistry, and spectroscopic properties of a heptamethine cyanine\ndye in MeCN","volume":"69","author":"Lee","year":"1997","journal-title":"Anal. Chem."},{"issue":"20","key":"2026090306454544500_cit2","doi-asserted-by":"publisher","first-page":"6380","DOI":"10.1021\/jacs.6b03037","article-title":"Near-infrared\nelectrogenerated chemiluminescence from aqueous soluble lipoic acid\nAu nanoclusters","volume":"138","author":"Wang","year":"2016","journal-title":"J. Am. Chem. Soc."},{"issue":"24","key":"2026090306454544500_cit3","doi-asserted-by":"publisher","first-page":"9603","DOI":"10.1021\/jacs.9b02547","article-title":"Near infrared electrochemiluminescence of rod-shape\n25-atom AuAg nanoclusters that is hundreds-fold stronger than that\nof Ru (bpy) 3 standard","volume":"141","author":"Chen","year":"2019","journal-title":"J. Am. Chem. Soc."},{"issue":"35","key":"2026090306454544500_cit4","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202509884","article-title":"Entire Near-Infrared-I\nElectrochemiluminescence Enhancement of Gold Nanoclusters","volume":"64","author":"Shen","year":"2025","journal-title":"Angew. Chem., Int. Ed."},{"issue":"11","key":"2026090306454544500_cit5","doi-asserted-by":"publisher","first-page":"109622","DOI":"10.1016\/j.cclet.2024.109622","article-title":"Recent advances in near infrared (NIR) electrochemiluminescence\nluminophores","volume":"35","author":"Zhou","year":"2024","journal-title":"Chin. Chem. 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Interfacial\nElectrochem."},{"issue":"43","key":"2026090306454544500_cit19","doi-asserted-by":"publisher","first-page":"9958","DOI":"10.1021\/ja990875h","article-title":"Molecular structure\u2013 property\nrelationships for electron-transfer rate attenuation in redox-active\ncore dendrimers","volume":"121","author":"Gorman","year":"1999","journal-title":"J. Am. Chem. Soc."},{"key":"2026090306454544500_cit20","doi-asserted-by":"publisher","first-page":"3246","DOI":"10.1039\/b704936f","article-title":"A neutral state green\npolymer with a superior transmissive light blue oxidized state","volume":"31","author":"Durmus","year":"2007","journal-title":"Chem. 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Soc."},{"issue":"3","key":"2026090306454544500_cit23","doi-asserted-by":"publisher","first-page":"1060","DOI":"10.1021\/jp807176y","article-title":"Ultrafast intersystem\ncrossing: Excited state dynamics of platinum acetylide complexes","volume":"113","author":"Ramakrishna","year":"2009","journal-title":"J. Phys. Chem. C"},{"issue":"13\u201314","key":"2026090306454544500_cit24","doi-asserted-by":"publisher","first-page":"1491","DOI":"10.1016\/j.ccr.2004.11.020","article-title":"The triplet state in Pt-acetylide oligomers, polymers\nand copolymers","volume":"249","author":"Silverman","year":"2005","journal-title":"Coord. Chem. Rev."},{"key":"2026090306454544500_cit25","doi-asserted-by":"publisher","first-page":"14","DOI":"10.1039\/df9500900014","article-title":"Characterization\nof electronic transitions in complex molecules","volume":"9","author":"Kasha","year":"1950","journal-title":"Discuss. 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Chem."},{"issue":"16","key":"2026090306454544500_cit33","doi-asserted-by":"publisher","first-page":"4053","DOI":"10.1021\/ic0102182","article-title":"Photophysics of\ndiimine platinum (II) bis-acetylide complexes","volume":"40","author":"Whittle","year":"2001","journal-title":"Inorg. Chem."},{"issue":"2","key":"2026090306454544500_cit34","doi-asserted-by":"publisher","first-page":"187","DOI":"10.1002\/wcms.83","article-title":"Spin\u2013orbit\ncoupling and intersystem crossing in molecules","volume":"2","author":"Marian","year":"2012","journal-title":"Wiley Interdiscip. Rev.: Comput. Mol. Sci."},{"issue":"5","key":"2026090306454544500_cit35","doi-asserted-by":"publisher","first-page":"929","DOI":"10.1021\/jp065892p","article-title":"Triplet Excited\nState in Platinum\u2013 Acetylide Oligomers: Triplet Localization\nand Effects of Conformation","volume":"111","author":"Glusac","year":"2007","journal-title":"J. Phys. Chem.\nB"},{"issue":"5","key":"2026090306454544500_cit36","doi-asserted-by":"publisher","first-page":"836","DOI":"10.1063\/1.1699044","article-title":"A theory\nof sensitized luminescence in solids","volume":"21","author":"Dexter","year":"1953","journal-title":"J. Chem.\nPhys."},{"issue":"38","key":"2026090306454544500_cit37","doi-asserted-by":"publisher","first-page":"9412","DOI":"10.1021\/ja010986s","article-title":"The energy gap law\nfor triplet states in Pt-containing conjugated polymers and monomers","volume":"123","author":"Wilson","year":"2001","journal-title":"J. Am. Chem. Soc."},{"issue":"15","key":"2026090306454544500_cit38","doi-asserted-by":"publisher","first-page":"3899","DOI":"10.1021\/jp010187w","article-title":"Spin\u2013orbit coupling\nand intersystem crossing in conjugated polymers: A configuration interaction\ndescription","volume":"105","author":"Beljonne","year":"2001","journal-title":"J. Phys. Chem. A"},{"issue":"1","key":"2026090306454544500_cit39","doi-asserted-by":"publisher","first-page":"150","DOI":"10.1021\/am800104k","article-title":"Low-band-gap\nplatinum acetylide polymers as active\nmaterials for organic solar cells","volume":"1","author":"Mei","year":"2009","journal-title":"ACS Appl.\nMater. 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