已经制备了富勒烯取代的联吡啶配体的rh(I)和钌(II)配合物。电化学研究表明,富勒烯亚基与金属络合部分之间存在一些基态电子相互作用,而Re(I)则不存在。通过在CH2Cl2溶液中的稳态和时间分辨UV / Vis-NIR发光光谱和纳秒激光闪光光解研究了光物理性质,并与相应的模型化合物进行了比较。在二元组中的亚甲基富勒烯部分的激发不会导致激发态组分间的相互作用。代替,金属络合单元的激发表明,以Re(I)或Ru(II)型单元为中心的最低三重态金属到配体电荷转移的激发态((3)MLCT)被淬灭常数约为2.5 x 10(8)s(-1)。淬灭归因于电子转移(ElT)过程,该过程导致碳球的还原,这是通过Ru(II)二元组的发光光谱确定的。由于金属络合部分相对于富勒烯单元的不利吸收,阻止了在Re(I)二聚体中电子转移的实验检测。但是,可以基于能量/动力学论证并与Ru(II)型数组进行比较。最初的ElT工
Fullerene-functionalized dendrons containing a C-60 Sphere at each branching unit have been prepared by a convergent approach using successive DCC-mediated esterifications followed by cleavage of a t-butyl ester moiety under acidic conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.
The synthesis of fullerene-functionalized dendritic branches (fullerodendrons) containing C60 spheres at each branching unit has been carried out by a convergent approach using successive esterification and deprotection steps. The tert-butyl protected fullerodendrons containing one, three or seven methanofullerene subunits can be characterized by ESMS owing to their reduction in the electrospray source