Selenoether macrocyclic chemistry–syntheses and ligand properties of new small-ring Se3- and Se2N-donor macrocycles
作者:William Levason、Joanna M. Manning、Gillian Reid、Matthew Tuggey、Michael Webster
DOI:10.1039/b900321e
日期:——
Simultaneous dropwise addition of thf/EtOH solutions of Se(CH2)3OTs}2 and o-C6H4(CH2SeCN)2 or NCSe(CH2)3SeCN to a suspension of NaBH4 in thf/EtOH at room temperature yields gram quantities of the 13- and 12-membered triselenoether macrocycles L1 and L2 respectively in high yield. The 11-membered ring L3 is obtained similarly by simultaneous dropwise addition of thf/EtOH solutions of Na2[o-C6H4Se2] (itself prepared by NaBH4reduction of the polymeric [o-C6H4Se2]n) and Se(CH2)3OTs}2 to a suspension of NaBH4 in thf/EtOH. The small-ring, potentially tridentate Se2N(pyridyl)-donor macrocycles L4 and L5 were obtained in essentially quantitative yield by simultaneous dropwise addition of thf/EtOH solutions of 2,6-bis(bromomethyl)pyridine and either o-C6H4(CH2SeCN)2 or NCSe(CH2)3SeCN to a suspension of NaBH4 in thf/EtOH at room temperature. L1âL5 have been characterised by 1H, 13C1H} and 77Se1H} NMR spectroscopy, EI MS, and for L1 and L4, by X-ray crystal structures. Reaction of PtMe3I with one mol. equiv. of L (L = L1âL5) in refluxing CHCl3 gives the ionic complexes [PtMe3(L)]I cleanly and in good yield. These were characterised by 1H, 13C1H}, 77Se1H} and 195Pt NMR spectroscopy, electrospray MS, microanalyses and by crystal structures of [PtMe3(L1)]I and [PtMe3(L4)]I, which confirm distorted octahedral coordination at Pt(IV), with fac-tridentate coordination of the macrocycle in all cases, with anionic iodide. The complexes [PtCl2(L)] (L = L1âL3) were obtained as poorly soluble yellow-orange solids by reaction of PtCl2 with L in MeCN solution. The d3Cr(III) complexes of L (L = L1âL5) were obtained by reaction with [CrCl3(thf)3] in anhydrous CH2Cl2 as distorted octahedral fac-[CrCl3(L)], as poorly soluble blue-purple through to green powdered solids, which have been characterised by microanalysis, UV-visible and IR spectroscopy and by their magnetic moments. The properties of these complexes are compared with related chalcogenoether complexes from the literature involving thioether and acyclic selenoether coordination.
在室温下,将 Se(CH2)3OTs}2 和 o-C6H4(CH2SeCN)2 或 NCSe(CH2)3SeCN 的 thf/EtOH 溶液同时滴加到 NaBH4 在 thf/EtOH 中的悬浮液中,可分别获得克级数量的 13 元和 12 元三硒醚大环 L1 和 L2,收率很高。将 Na2[o-C6H4Se2](通过 NaBH4 还原聚合物 [o-C6H4Se2]n)和 Se(CH2)3OTs}2 的 thf/EtOH 溶液同时滴加到 NaBH4 在 thf/EtOH 中的悬浮液中,同样可以得到 11 元环 L3。在室温下,将 2,6-双(溴甲基)吡啶和 o-C6H4(CH2SeCN)2 或 NCSe(CH2)3SeCN的thf/EtOH溶液同时滴加到NaBH4在thf/EtOH中的悬浮液中,基本上定量地得到了小环、潜在三叉Se2N(吡啶基)-供体大环L4和L5。L1âL5 的特征通过 1H、13C1H} 和 77Se1H}NMR 光谱、EI MS 以及 X 射线晶体结构对 L1 和 L4 进行了表征。在回流的 CHCl3 中,PtMe3I 与一摩尔当量的 L(L = L1âL5)反应,可以得到离子络合物 [PtMe3(L)]I,而且产率高。通过 1H、13C1H}、77Se1H} 和 195Pt NMR 光谱、电喷雾质谱、微量分析以及 [PtMe3(L1)]I 和 [PtMe3(L4)]I 的晶体结构对其进行了表征。PtCl2 与 L 在 MeCN 溶液中反应得到[PtCl2(L)](L = L1âL3 )配合物,它们是难溶的橘黄色固体。通过在无水 CH2Cl2 中与[CrCl3(thf)3]反应得到的 L 的 d3Cr(III)配合物(L = L1âL5)为畸变八面体面-[CrCl3(L)],为难溶的蓝紫色至绿色粉末状固体。这些配合物的特性与文献中涉及硫醚和无环烯醚配位的相关缩醛醚配合物进行了比较。