School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK.
Dalton Trans. 2012 Nov 7;41(41):12839-46. doi: 10.1039/c2dt31740k.
The butyl and isopropyl derivatives (4I, 5Br) of chiral pool derived bis-imidazolium dehydrohexitol salts have been prepared. The ditopic N-heterocyclic carbenes 4 and 5 form dinuclear Ag(I) and Pt(II) complexes. All compounds were fully characterised by multinuclear NMR spectroscopy. The bis-imidazolium salt 4I and platinum complexes cis-[Pt(2)(μ-2)(dmso)(2)Cl(4)] and cis-[Pt(2)(μ-4)(dmso)(2)Cl(4)] were characterised by X-ray crystallography. In the case of the Pt(II) complexes, the carbene ring is positioned in a sterically preferred orientation, approximately perpendicular to the platinum coordination plane. The (1)H, (13)C, (15)N and (195)Pt NMR spectra of the platinum complexes show the presence of rotamers due to hindered rotation about the carbene-metal bond.
已制备出由手性池衍生的双咪唑𬭩去氢己糖醇盐的丁基和异丙基衍生物（4I、5Br）。双齿 N-杂环卡宾 4 和 5 形成双核 Ag（I）和 Pt（II）配合物。所有化合物均通过多核 NMR 光谱进行了充分表征。双咪唑𬭩盐 4I 和铂配合物顺式-[Pt(2)(μ-2)(dmso)(2)Cl(4)]和顺式-[Pt(2)(μ-4)(dmso)(2)Cl(4)]通过 X 射线晶体学进行了表征。对于 Pt(II)配合物，卡宾环处于空间位阻优先取向，几乎垂直于铂配位平面。铂配合物的 (1)H、(13)C、(15)N 和 (195)Pt NMR 谱表明，由于卡宾-金属键的旋转受阻，存在旋转异构体。
