{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T22:27:22Z","timestamp":1783031242396,"version":"3.54.6"},"reference-count":0,"publisher":"American Scientific Publishers","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["j nanosci nanotechnol"],"published-print":{"date-parts":[[2008,3,1]]},"abstract":"<jats:p>A supersensitivity of the formation and stabilization of transition-metal nanoclusters to the initial nanocluster concentration and temperature synthesis conditions is reported, then probed, herein for the specific case of prototype Ir(0)<jats:sub><jats:italic>n<\/jats:italic><\/jats:sub> nanoclusters prepared from\n the organometallic precursor [Bu<jats:sub>4<\/jats:sub>N]<jats:sub>5<\/jats:sub>Na<jats:sub>3<\/jats:sub>[(1,5-COD)Ir\u00b7P<jats:sub>2<\/jats:sub>W<jats:sub>15<\/jats:sub>Nb<jats:sub>3<\/jats:sub>O<jats:sub>62<\/jats:sub>] by reduction with H<jats:sub>2<\/jats:sub> in propylene carbonate solvent. Fully isolable, redissolvable, near-monodisperse (i.e., \u2264\u00b1 15% size\n distribution) and thus excellent Ir(0)<jats:sub><jats:italic>n<\/jats:italic><\/jats:sub> nanoclusters are formed using low temperature (22 \u00b0C) and moderate precursor concentration (1.2 mM) in propylene carbonate solvent. <jats:italic>However<\/jats:italic>, inferior, polydisperse (\u00b140% size distribution), non-redispersable nanoclusters\n are formed at the seemingly only moderately different conditions of 38 \u00b0C higher temperature (i.e., 60 \u00b0C) and 5-fold lower precursor concentration (0.24 mM). Investigation of this supersensitivity to the nanocluster synthesis conditions reveals that it derives from the dissociation\n of (1,5-COD)Ir(solvent)<jats:sup>+<\/jats:sup><jats:sub>2<\/jats:sub> from the P<jats:sub>2<\/jats:sub>W<jats:sub>15<\/jats:sub>Nb<jats:sub>3<\/jats:sub>O<jats:sup>9\u2212<\/jats:sup><jats:sub>62<\/jats:sub> polyanionic ligand\/stabilizer, subsequently resulting in a too fast, kinetically uncontrolled reduction of the quickly reduced (1,5-COD)Ir(solvent)<jats:sup>+<\/jats:sup><jats:sub>2<\/jats:sub>\n as the cause of the inferior synthesis of polydisperse, non-isolable, non-redissolvable nanoclusters. The results are significant in that they illustrate that understanding the mechanism of nanocluster formation, and then performing the nanocluster synthesis under kinetically carefully controlled,\n understood conditions, is necessary for the formation of superior nanoclusters in this, and by implication probably many other, cases.<\/jats:p>","DOI":"10.1166\/jnn.2008.089","type":"journal-article","created":{"date-parts":[[2008,3,11]],"date-time":"2008-03-11T23:28:57Z","timestamp":1205278137000},"page":"1551-1556","source":"Crossref","is-referenced-by-count":18,"title":["Supersensitivity of Transition-Metal Nanoparticle Formation to Initial Precursor Concentration and Reaction Temperature: Understanding Its Origins"],"prefix":"10.1166","volume":"8","author":[{"given":"Lisa Starkey","family":"Ott","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard G.","family":"Finke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"17","container-title":["Journal of Nanoscience and Nanotechnology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ingentaconnect.com\/content\/asp\/jnn\/2008\/00000008\/00000003\/art00085","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2020,4,16]],"date-time":"2020-04-16T04:35:05Z","timestamp":1587011705000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ingentaconnect.com\/content\/10.1166\/jnn.2008.089"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,3,1]]},"references-count":0,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2008,3,1]]}},"alternative-id":["1533-4880(20080301)8:3L.1551;1-"],"URL":"https:\/\/doi.org\/10.1166\/jnn.2008.089","relation":{},"ISSN":["1533-4880"],"issn-type":[{"value":"1533-4880","type":"print"}],"subject":[],"published":{"date-parts":[[2008,3,1]]}}}