Synthesis, electrochemistry and structural characterization of new dimeric cobalt η2-alkyne carbonyl complexes
| Autor: | Wai Yeung Wong, Hoi Yan Lam, Siu Ming Lee |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Ligand Organic Chemistry chemistry.chemical_element Alkyne Crystal structure Fluorene Electrochemistry Biochemistry Inorganic Chemistry Crystallography chemistry.chemical_compound chemistry Materials Chemistry Molecule Physical and Theoretical Chemistry Cyclic voltammetry Cobalt |
| Zdroj: | Journal of Organometallic Chemistry. 595:70-80 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(99)00574-4 |
| Popis: | New dimeric η 2 -diyne complexes of cobalt [{Co 2 (CO) 6 } 2 (diyne)] (diyne=Me 3 SiC 2 (C 13 H 8 )C 2 SiMe 3 ( 1 ), Me 3 SiC 2 (C 13 H 6 O)C 2 SiMe 3 ( 2 ), Me 3 SiC 2 (C 4 H 2 S) 2 C 2 SiMe 3 ( 3 ), Me 3 SiC 2 (C 14 H 7 Fc)C 2 SiMe 3 (Fc=ferrocenyl) ( 4 ), HC 2 (C 13 H 8 )C 2 H ( 5 ), HC 2 (C 13 H 6 O)C 2 H ( 6 ), HC 2 (C 4 H 2 S) 2 C 2 H ( 7 ) and HC 2 (C 14 H 7 Fc)C 2 H ( 8 )) have been prepared in good yields from the reaction of [Co 2 (CO) 8 ] with half an equivalent of the appropriate diyne ligands Me 3 SiCCRCCSiMe 3 and HCCRCCH, respectively (R=2,7-fluorenediyl, 2,7-fluoren-9-onediyl, 2,2′-bithiophene-5,5′-diyl, 9-ferrocenylmethylenefluorene-2,7-diyl). All the compounds 1 – 8 have been characterized by IR and 1 H-NMR spectroscopies and mass spectrometry. The redox chemistry of these cobalt–alkyne molecules has been studied by cyclic voltammetry. The molecular structures of 2 , 5 , 6 , 7 and 8 have been determined by single-crystal X-ray diffraction methods. Structurally, each of these displays two ‘Co 2 C 2 ’ cores adopting the usual pseudo-tetrahedral geometry with the alkyne bond lying essentially perpendicular to the CoCo vector. The original linearity of the diyne ligand is lost. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect