کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1326372 | 977427 | 2009 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Hydrogen bonding interaction of CpCo(Dithiolene) complex with monocyclic 2-pyridonyl substituent and unexpected formation of dithiolene-fused tricyclic pyridone derivative Hydrogen bonding interaction of CpCo(Dithiolene) complex with monocyclic 2-pyridonyl substituent and unexpected formation of dithiolene-fused tricyclic pyridone derivative](/preview/png/1326372.png)
One-pot reaction of [CpCo(CO)2], elemental sulfur with some heterocycle-substituted alkynes (R–CC–HET) produced [CpCo(dithiolene)] complexes with 2PyOBn (2), with both 2PyOBn and 2-hydroxy-2-propyl groups (C(OH)Me2) (5), both 2Py and C(OH)Me2 (8), both 4Py and C(OH)Me2 (11), and with 4Py substituent (13). A deprotection of benzyl group (Bn) from 2 with trimethylsilyl iodide formed [CpCo(dithiolene)] with 2-pyridonyl substituent (3). Heating reaction of 8 without any base resulted in the C(OH)Me2 group elimination to form the 2-pyridylethylenedithiolate complex (9), but 11 underwent only dehydration at the C(OH)Me2 under heating. While the preparation of 5, the benzyl free complex (6) was obtained as a main product. 6 has a dithiolene-fused tricyclic pyridone skeleton. The structures of 3, 5, 6, 8, and 11 were determined by X-ray diffraction studies. Intramolecular OH⋯N(2Py) hydrogen bondings are found in 5 and 8, and an intermolecular OH⋯N(4Py) one is found in 11 at solid state. In the 2-pyridonyl complex 3, intermolecular NH⋯O and CH(dithiolene)⋯O hydrogen bondings are observed. 8 showed an intermolecular Cp⋯Cp face-to-face interaction. The tricyclic complex 6 exhibited lower energy electronic absorption (λmax = 668 nm) compared with the others (λmax = 562–614 nm), due to an extended π-conjugation of aromatic cobaltadithiolene ring.
[CoCp(dithiolene)] complexes having 2-pyridonyl group were obtained and their X-ray structure analyses indicated dithiolene-fused tricyclic pyridone structure and NH⋯O and CH(dithiolene)⋯O hydrogen bondings. The tricyclic pyridone complex exhibited lower energy electronic absorption (λmax = 668 nm) compared with the others (λmax = 562–614 nm), due to an extended π-conjugation of aromatic cobaltadithiolene ring.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 694, Issue 18, 15 August 2009, Pages 2902–2911