Multifunctional and Reactive Enantiopure Organometallic Helicenes: Tuning Chiroptical Properties by Structural Variations of Mono- and Bis(platinahelicene)s
作者:Emmanuel Anger、Mark Rudolph、Lucie Norel、Samia Zrig、Chengshuo Shen、Nicolas Vanthuyne、Loïc Toupet、J. A. Gareth Williams、Christian Roussel、Jochen Autschbach、Jeanne Crassous、Régis Réau
DOI:10.1002/chem.201101866
日期:2011.12.9
helicene derivatives that exhibit large and tuneable chiroptical properties that can be rationalized theoretically and compared to the parent [6]‐ and [7]carbohelicenes. Furthermore, they are red phosphors at room temperature and their large chiroptical properties can be modulated by oxidation of the metal center to PtIV. Hetero‐ and homochiral diastereomeric bis(metallahelicene)s that possess a rare
乙酰丙酮乙酰铂[6]和铂[7]螺旋酮是由2-吡啶基取代的苯并菲配体通过两步环铂反应制得的。已测量了拆分对映异构体的光物理性质(紫外可见吸收和发射行为)和手性(圆二色性和摩尔旋转)。这些金属二十二烯构成了一个易于获得的新的烯类衍生物家族,这些衍生物具有较大且可调节的手性,可在理论上进行合理化,并与母体[6]-和[7]碳硼烷烯进行比较。此外,它们在室温下为红色磷光体,可通过将金属中心氧化为四价铬来调节其较大的手性。。杂合子和纯手性非对映体的双(metallahelicene),其具有一个罕见的Pt小号III 铂III支架桥接由benzoato也已制备的配体。结果表明,杂手性(P,M)-bis (Pt III – [6]螺旋)9 a 1可以异构化为同手性的(P,P)-和(M,M)-bis(Pt III- [6] [helicene)9 a 2。借助依赖于时间的密度泛函理论,对这些系统进行了光谱