Conformational behaviour of dinuclear Rh(I) complexes of the open-chain tetrapyrrolic ligand 2,2′-bidipyrrin (H₂BDP)

详细信息    查看全文

• 作者：Martin Brö ; ring and Esther Có ; nsul Tejero
• 关键词：Oligopyrroles ; Conformational control ; Rhodium
• 刊名：Journal of Organometallic Chemistry
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：690
• 期：23
• 页码：5290-5299
• 全文大小：248 K

文摘

The reaction of 2,2′-bidipyrrins H₂BDP with the Rh^I complexes [Rh(COD)(μ-OMe)]₂ and [Rh(CO)₂(μ-Cl)]₂ yields the neutral species [{Rh(COD)}₂BDP] (7, 8) and [{Rh(CO)₂}₂BDP] (2, 9), respectively. Treatment of the COD complexes with carbon monoxide results in the exchange of all COD ligands against CO. Ligand exchange studies on the carbonyl complexes 2 and 9 with different phosphane donors reveal the regioselective exchange of one CO per metal ion. In most cases, the reaction is accompanied by a large conformational change of the tetrapyrrole from a syn to an anti conformation. This conformational change was resolved by a combination of NMR spectroscopy and X-ray diffraction studies.