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While the copper complexes form ligand\u2010bridged dimers, the zinc compounds are monomeric. Due to different steric demand of the ligand the arrangement of the ligands within the dimeric complexes varies. Similar to the structurally related iminophosphonamide complexes of alkali metals and calcium, the steady\u2010state and time\u2010resolved photoluminescence (PL) of four of the seven compounds studied here as solids in a temperature range of 5\u2013295\u2005K can be described within the scheme of thermally activated delayed fluorescence (TADF). Accordingly, they exhibit bright blue\u2010green phosphorescence at low temperatures (&lt;100\u2005K), which turns into delayed fluorescence by increasing the temperature. However, unusually, the fluorescence is practically absent in two copper complexes which otherwise still conform to the TADF scheme. In these cases, the excited singlet states decay essentially non\u2010radiatively and their thermal population from the corresponding low\u2010lying triplet states efficiently quenches PL (phosphorescence). Three other copper and zinc complexes only exhibit prompt fluorescence, evidencing a wide variation of photophysical properties in this class of compounds. The excited states of the copper complex with especially pronounced phosphorescence quenching were also investigated by low\u2010temperature time\u2010resolved infrared spectroscopy and quantum chemical calculations.<\/jats:p>","DOI":"10.1002\/chem.202101247","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T06:39:55Z","timestamp":1619419195000},"page":"15110-15119","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Thermally Activated Delayed Fluorescence and Phosphorescence Quenching in Iminophosphonamide Copper and Zinc Complexes"],"prefix":"10.1002","volume":"27","author":[{"given":"Bhupendra","family":"Goswami","sequence":"first","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT)  Engesserstrasse 15 76131 Karlsruhe Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9278-0678","authenticated-orcid":false,"given":"Thomas J.","family":"Feuerstein","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT)  Engesserstrasse 15 76131 Karlsruhe Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ravi","family":"Yadav","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT)  Engesserstrasse 15 76131 Karlsruhe Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sergei","family":"Lebedkin","sequence":"additional","affiliation":[{"name":"Institute of Nanotechnology Karlsruhe Institute of Technology (KIT)  Hermann-von-Helmholtz-Platz\u20051 76344 Eggenstein-Leopoldshafen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pit J.","family":"Boden","sequence":"additional","affiliation":[{"name":"Fachbereich Chemie und Forschungszentrum OPTIMAS TU Kaiserslautern  67663 Kaiserslautern Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sophie T.","family":"Steiger","sequence":"additional","affiliation":[{"name":"Fachbereich Chemie und Forschungszentrum OPTIMAS TU Kaiserslautern  67663 Kaiserslautern Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gereon","family":"Niedner\u2010Schatteburg","sequence":"additional","affiliation":[{"name":"Fachbereich Chemie und Forschungszentrum OPTIMAS TU Kaiserslautern  67663 Kaiserslautern Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Gerhards","sequence":"additional","affiliation":[{"name":"Fachbereich Chemie und Forschungszentrum OPTIMAS TU Kaiserslautern  67663 Kaiserslautern Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1199-1730","authenticated-orcid":false,"given":"Manfred M.","family":"Kappes","sequence":"additional","affiliation":[{"name":"Institute of Nanotechnology Karlsruhe Institute of Technology (KIT)  Hermann-von-Helmholtz-Platz\u20051 76344 Eggenstein-Leopoldshafen Germany"},{"name":"Institute of Physical Chemistry Karlsruhe Institute of Technology (KIT)  Fritz-Haber Weg 2 76131 Karlsruhe Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0915-3893","authenticated-orcid":false,"given":"Peter W.","family":"Roesky","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT)  Engesserstrasse 15 76131 Karlsruhe Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,6]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0010-8545(02)00012-7"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/c2cs35180c"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9DT04532E"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202013622"},{"key":"e_1_2_9_4_2","first-page":"4101","volume":"8","year":"2021","journal-title":"Angew. 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