{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T16:38:55Z","timestamp":1791823135145,"version":"4.3.4"},"reference-count":23,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"5687","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Science"],"published-print":{"date-parts":[[2004,8,20]]},"abstract":"<jats:p>\n            Unlike mercury, which has an extensive +1 oxidation state chemistry, zinc usually adopts the +2 oxidation state. Decamethyldizincocene, Zn\n            <jats:sub>2<\/jats:sub>\n            (\u03b7\n            <jats:sup>5<\/jats:sup>\n            -C\n            <jats:sub>5<\/jats:sub>\n            Me\n            <jats:sub>5<\/jats:sub>\n            )\n            <jats:sub>2<\/jats:sub>\n            , an organometallic compound of Zn(I) formally derived from the dimetallic [Zn\u2013Zn]\n            <jats:sup>2+<\/jats:sup>\n            unit, has been isolated from the low-temperature (\u201310\u00b0C) reaction of Zn(C\n            <jats:sub>5<\/jats:sub>\n            Me\n            <jats:sub>5<\/jats:sub>\n            )\n            <jats:sub>2<\/jats:sub>\n            and Zn(C\n            <jats:sub>2<\/jats:sub>\n            H\n            <jats:sub>5<\/jats:sub>\n            )\n            <jats:sub>2<\/jats:sub>\n            in diethyl ether. X-ray studies show that it contains two eclipsed Zn(\u03b7\n            <jats:sup>5<\/jats:sup>\n            -C\n            <jats:sub>5<\/jats:sub>\n            Me\n            <jats:sub>5<\/jats:sub>\n            ) fragments with a Zn\u2013Zn distance (\u00b1 standard deviation) of 2.305(\u00b13) angstroms, indicative of a metal-metal bonding interaction.\n          <\/jats:p>","DOI":"10.1126\/science.1101356","type":"journal-article","created":{"date-parts":[[2004,8,20]],"date-time":"2004-08-20T17:58:40Z","timestamp":1093024720000},"page":"1136-1138","source":"Crossref","is-referenced-by-count":553,"title":["Decamethyldizincocene, a Stable Compound of Zn(I) with a Zn-Zn Bond"],"prefix":"10.1126","volume":"305","author":[{"given":"Irene","family":"Resa","sequence":"first","affiliation":[{"name":"Instituto de Investigaciones Qui\u0301micas\u2013Departamento de Qui\u0301mica Inorga\u0301nica, Universidad de Sevilla, Consejo Superior de Investigaciones Cienti\u0301ficas, Ame\u0301rico Vespucio 49, 41092 Sevilla, Spain."},{"name":"Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cienti\u0301ficas, Campus de Cantoblanco, 28049 Madrid, Spain."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ernesto","family":"Carmona","sequence":"additional","affiliation":[{"name":"Instituto de Investigaciones Qui\u0301micas\u2013Departamento de Qui\u0301mica Inorga\u0301nica, Universidad de Sevilla, Consejo Superior de Investigaciones Cienti\u0301ficas, Ame\u0301rico Vespucio 49, 41092 Sevilla, Spain."},{"name":"Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cienti\u0301ficas, Campus de Cantoblanco, 28049 Madrid, Spain."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enrique","family":"Gutierrez-Puebla","sequence":"additional","affiliation":[{"name":"Instituto de Investigaciones Qui\u0301micas\u2013Departamento de Qui\u0301mica Inorga\u0301nica, Universidad de Sevilla, Consejo Superior de Investigaciones Cienti\u0301ficas, Ame\u0301rico Vespucio 49, 41092 Sevilla, Spain."},{"name":"Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cienti\u0301ficas, Campus de Cantoblanco, 28049 Madrid, Spain."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Angeles","family":"Monge","sequence":"additional","affiliation":[{"name":"Instituto de Investigaciones Qui\u0301micas\u2013Departamento de Qui\u0301mica Inorga\u0301nica, Universidad de Sevilla, Consejo Superior de Investigaciones Cienti\u0301ficas, Ame\u0301rico Vespucio 49, 41092 Sevilla, Spain."},{"name":"Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cienti\u0301ficas, Campus de Cantoblanco, 28049 Madrid, Spain."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_1_2_2","unstructured":"F. A. Cotton G. Wilkinson C. A. Murillo M. Bochmann Advanced Inorganic Chemistry (Wiley New York ed. 6 1999) chap. 15."},{"key":"e_1_3_1_3_2","unstructured":"N. Wiberg Ed. Holleman-Wiberg Inorganic Chemistry (Academic Press New York ed. 34 2001) chap. XXIII."},{"key":"e_1_3_1_4_2","first-page":"517","volume":"1986","year":"1986","unstructured":"R. Faggiani, R. J. Gillespie, J. E. Vekris, J. Chem. Soc. Chem. Commun.1986, 517 (1986).","journal-title":"J. Chem. Soc. Chem. Commun."},{"key":"e_1_3_1_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00075a085"},{"key":"e_1_3_1_6_2","first-page":"1122","volume":"1967","year":"1967","unstructured":"D. H. Kerridge, S. A. Tariq, J. Chem. Soc. A1967, 1122 (1967).","journal-title":"J. Chem. Soc. A"},{"key":"e_1_3_1_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1387-1811(98)00154-1"},{"key":"e_1_3_1_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja0343757"},{"key":"e_1_3_1_9_2","unstructured":"P. O'Brien in Comprehensive Organometallic Chemistry II G. Wilkinson F. G. A. Stone E. Abel Eds. (Pergamon Oxford UK 1995) vol. 3 chap. 4."},{"key":"e_1_3_1_10_2","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1002\/recl.19881070330","volume":"107","year":"1988","unstructured":"J. T. B. H. Jastrzebski, J. Boersma, G. van Koten, W. J. J. Smeets, A. L. Spek, Recl. Trav. Chim. Pays-Bas107, 263 (1988).","journal-title":"Recl. Trav. Chim. Pays-Bas"},{"key":"e_1_3_1_11_2","first-page":"113","volume":"40","year":"1986","unstructured":"R. Blomet al., Acta Chem. Scand. A40, 113 (1986).","journal-title":"Acta Chem. Scand. A"},{"key":"e_1_3_1_12_2","unstructured":"Data were identified by x-ray powder diffraction."},{"key":"e_1_3_1_13_2","unstructured":"Materials and methods are available as supporting material on Science Online."},{"key":"e_1_3_1_14_2","unstructured":"Two x-ray crystallographic analyses were carried out. The first made use of Bruker-Siemens Smart 1K charge-coupled device (CCD) diffractometer with a graphite monochromated Mo- K \u03b1 (\u03bb = 0.71073 \u00c5) radiation. Crystal data for 1 was as follows: C 20 H 30 Zn 2 ; molecular weight = 401.18; triclinic; space group P 1; Z = 2; T 173 (\u00b12) K; a = 6.9329 (\u00b13) \u00c5 b = 10.8831 (\u00b15) \u00c5 c = 13.8384 (\u00b17) \u00c5 \u03b1 = 109.777 (\u00b11)\u00b0 \u03b2 = 101.603 (\u00b11)\u00b0 \u03b3 = 94.201 (\u00b11)\u00b0 and V = 951.09 (\u00b18) \u00c5 3 ; goodness of fit = 0.988; R1[ I > 2\u03c3( I )] = 0.031; wR2 = 0.076 (all data). Atomic coordinates bond lengths and angles and other important parameters have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication CCDC 233010. Details of the x-ray crystallographic analysis are also available on Science Online. The second analysis was carried out at \u2013173\u00b0C (100 K) with the use of Cu- K \u03b1 (\u03bb = 1.54184 \u00c5) radiation on a Bruker Smart 6000 CCD system equipped with a rotating anode. The results of the two determinations are very similar. Data from the second analysis can be obtained from the authors upon request."},{"key":"e_1_3_1_15_2","unstructured":"A compound initially formulated as Co 2 (\u03b7 5 -C 5 Me 5 ) 2 by J. J. Schneider R. Goddard S. Werner and C. Kr\u00fcger [ Angew. Chem. Int. Ed. Engl. 30 1124 (1991)] was subsequently shown to be Co 2 (\u03b7 5 -C 5 Me 5 ) 2 (\u03bc-H) 3 20 ."},{"key":"e_1_3_1_16_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199213411"},{"key":"e_1_3_1_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr941099t"},{"key":"e_1_3_1_18_2","unstructured":"L. Pauling The Nature of the Chemical Bond (Cornell Univ. Press Ithaca NY ed. 3 1960) chap. 7."},{"key":"e_1_3_1_19_2","first-page":"466","volume":"1971","year":"1971","unstructured":"E. Dorn, J. Chem. Soc. Chem. Commun.1971, 466 (1971).","journal-title":"J. Chem. Soc. Chem. Commun."},{"key":"e_1_3_1_20_2","first-page":"1118","volume":"2001","year":"2001","unstructured":"H. Haoet al., Chem. Commun.2001, 1118 (2001), and references therein.","journal-title":"Chem. Commun."},{"key":"e_1_3_1_21_2","unstructured":"In this refinement the data with large 2\u03b8 angles were given higher weights followed by a difference electron density synthesis with reflections with sin\u03b8\/\u03bb."},{"key":"e_1_3_1_22_2","first-page":"717","volume":"1991","year":"1991","unstructured":"R. Han, I. B. Gorrell, A. G. Looney, G. Parkin, J. Chem. Soc. Chem. Commun.1991, 717 (1991).","journal-title":"J. Chem. Soc. Chem. Commun."},{"key":"e_1_3_1_23_2","first-page":"1233","volume":"1967","year":"1967","unstructured":"G. E. Coates, P. D. Roberts, J. Chem. Soc. A1967, 1233 (1967).","journal-title":"J. Chem. Soc. A"},{"key":"e_1_3_1_24_2","unstructured":"In memoriam of Professor Roberto Fern\u00e1ndez de Caleya. We thank A. Justo (x-ray powder diffraction) M. A. Avil\u00e9s (Raman spectra) and R. Fern\u00e1ndez for their valuable help and R. A. Andersen (University of California Berkeley) for obtaining the mass spectrum of compound 1 . Supported by the Ministry of Science and Technology of Spain (to E.C. Project BQU2001-1995; and to I.R. for a research studentship)."}],"container-title":["Science"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.science.org\/doi\/pdf\/10.1126\/science.1101356","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,1,10]],"date-time":"2024-01-10T03:29:50Z","timestamp":1704857390000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.science.org\/doi\/10.1126\/science.1101356"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,8,20]]},"references-count":23,"journal-issue":{"issue":"5687","published-print":{"date-parts":[[2004,8,20]]}},"alternative-id":["10.1126\/science.1101356"],"URL":"https:\/\/doi.org\/10.1126\/science.1101356","relation":{},"ISSN":["0036-8075","1095-9203"],"issn-type":[{"value":"0036-8075","type":"print"},{"value":"1095-9203","type":"electronic"}],"subject":[],"published":{"date-parts":[[2004,8,20]]}}}