{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T01:55:21Z","timestamp":1792029321119,"version":"4.4.0"},"reference-count":42,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"5629","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Science"],"published-print":{"date-parts":[[2003,7,4]]},"abstract":"\n Dinitrogen (N\n 2<\/jats:sub>\n ) was reduced to ammonia at room temperature and 1 atmosphere with molybdenum catalysts that contain tetradentate [HIPTN\n 3<\/jats:sub>\n N]\n 3\u2013<\/jats:sup>\n triamidoamine ligands {such as [HIPTN\n 3<\/jats:sub>\n N]Mo(N\n 2<\/jats:sub>\n ), where [HIPTN\n 3<\/jats:sub>\n N]\n 3\u2013<\/jats:sup>\n is [{3,5-(2,4,6-i-Pr\n 3<\/jats:sub>\n C\n 6<\/jats:sub>\n H\n 2<\/jats:sub>\n )\n 2<\/jats:sub>\n C\n 6<\/jats:sub>\n H\n 3<\/jats:sub>\n NCH\n 2<\/jats:sub>\n CH\n 2<\/jats:sub>\n }\n 3<\/jats:sub>\n N]\n 3\u2013<\/jats:sup>\n } in heptane. Slow addition of the proton source [{2,6-lutidinium}{BAr\u2032\n 4<\/jats:sub>\n }, where Ar\u2032 is 3,5-(CF\n 3<\/jats:sub>\n )\n 2<\/jats:sub>\n C\n 6<\/jats:sub>\n H\n 3<\/jats:sub>\n ]and reductant (decamethyl chromocene) was critical for achieving high efficiency (\u223c66% in four turnovers). Numerous x-ray studies, along with isolation and characterization of six proposed intermediates in the catalytic reaction under noncatalytic conditions, suggest that N\n 2<\/jats:sub>\n was reduced at a sterically protected, single molybdenum center that cycled from Mo(III) through Mo(VI) states.\n <\/jats:p>","DOI":"10.1126\/science.1085326","type":"journal-article","created":{"date-parts":[[2003,7,3]],"date-time":"2003-07-03T19:45:48Z","timestamp":1057261548000},"page":"76-78","source":"Crossref","is-referenced-by-count":1382,"title":["Catalytic Reduction of Dinitrogen to Ammonia at a Single Molybdenum Center"],"prefix":"10.1126","volume":"301","author":[{"given":"Dmitry V.","family":"Yandulov","sequence":"first","affiliation":[{"name":"Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard R.","family":"Schrock","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_1_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00106a002"},{"key":"e_1_3_1_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr950055x"},{"key":"e_1_3_1_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1367-5931(00)00132-0"},{"key":"e_1_3_1_5_2","first-page":"89","volume":"40","year":"1996","unstructured":"D. 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