compounds. At 77 K, no quenching of the Ru(II)-based excited state is observed, whereas energy transfer from excited Rh(III) to Ru(II) is observed for all complexes. At 150 K, energy transfer from excited Rh(III) to Ru(II) is again observed for all complexes, while quenching of excited Ru(II) by electron transfer to Rh(III) is observed, but only in the complex with n = 0. The reasons for the observed
                                    一系列具有通式(ttpy)Ru-tpy-(ph)(n)-tpy-Rh(ttpy)(5+)(n = 0-2)的双核Ru(II)-Rh(III)配合物合成,其中ttpy = 4'-p-tolyl-2,2':6,2“-
吡啶和tpy-(ph)(n)-tpy代表桥联
配体,其中两个2,2':6',2” -叔
吡啶单元可以直接连接在一起(n = 0),也可以通过4'位的一个(n = 1)或两个(n = 2)苯基间隔基连接。该系列络合物的特征在于(i)刚性桥结构和(ii)可变的
金属-
金属距离(n = 0时为11Å,n = 1时为15.5Å,n = 2时为20Å)。这些双核络合物的光物理性质已在4中进行了研究:分别在77 K(刚性
玻璃)和150 K(流体溶液)下的
甲醇/
乙醇溶液中,与单核[Ru(ttpy)(2)(2+)和Rh(ttpy)(2)(3+)]进行比较双核[(ttpy)Ru-tpy-tpy-Ru(ttpy)(4+)]模型化合物。在77