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|標題:||Preparation and characterization of tricobalt methylidyne clusters: X-ray crystal structures of Co-3(CO)(9)(mu 3-CR) (R = CH2CH3, CH2C(=O)NH2, CH2C(=O)CH3) and CO3(CO)(7)(mu-P,P-PPh2CH2PPh2)(mu(3)-CCH2C6H4NH2)||作者:||Hong, F.E.
|關鍵字:||tricobalt methylidyne clusters;alkynamines;alkyne-bridged dicobalt;complexes;bis(diphenylphosphino)methane;butterfly cluster;complexes;carbonyl||Project:||Applied Organometallic Chemistry||期刊/報告no：:||Applied Organometallic Chemistry, Volume 17, Issue 6-7, Page(s) 458-464.||摘要:||
A small quantity of the tricobalt methylidyne cluster [Co-3(CO)(9)(mu(3)-CCH2CH3)] (2) was obtained, along with the major product, [([Co-2(CO)(6)(mu-HC=C-)]-CH2NH)(2)C=O] (1), from the reaction of HC=-CCH2NH2 with Co-2(CO)(8) in tetrahydrofuran at 45degreesC for 5 h. The crystal structure of 2 showed that the amino group was unexpectedly detached from the propargylamine. The reactions of two related amines, HC=CC6H4NH2 and HC=CC(=O)NH2, with Co-2(CO)(8) gave two tricobalt methylidyne clusters, [Co-3(CO)(9)(mu(3)-CCH2C6H4NH2)] (5) and [Co-3(CO)(9)(mu(3)-CCH2C(=O)NH2)] (7), respectively. Further reaction of 5 with bis(diphenylphosphino)methane (DPPM) resulted in the formation of the DPPM-bridged tricobalt methylidyne cluster [Co-3(CO)(7)(mu-P,P-PPh2CH2PPh2)(mu(3)-CCH2C6H4NH2)] (6). Similar procedures were followed for the reaction of HC=C-C(=O)CH3 with Co-2(CO)(8); two compounds, [Co-3(CO)(9)(mu(3)-CCH2C(=O)CH3)] (8) and [Co-2(CO)(6)(mu(2)-eta(2)-HC=CC(=O)CH3)] (9), were obtained. All these compounds were characterized by spectroscopic means; the crystal structures of 2, 5, 6, and 7 were also determined. Copyright (C) 2003 John Wiley Sons, Ltd.
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