Solvent Switching of Intramolecular Energy Transfer in Bichromophoric Systems: Photophysics of (2,2‘-Bipyridine)tetracyanoruthenate(II)/Pyrenyl Complexes
作者:M. T. Indelli、M. Ghirotti、A. Prodi、C. Chiorboli、F. Scandola、N. D. McClenaghan、F. Puntoriero、S. Campagna
DOI:10.1021/ic034185x
日期:2003.9.1
The supramolecular systems [Ru(Pyr(n)bpy)(CN)(4)](2-) (n = 1, 2), where one and two pyrenyl units are linked via two-methylene bridges to the [Ru(bpy)(CN)(4)](2-) chromophore, have been synthesized. The photophysical properties of these systems, which contain a highly solvatochromic metal complex moiety, have been investigated in water, methanol, and acetonitrile. In all solvents, prompt and efficient
超分子系统[Ru(Pyr(n)bpy)(CN)(4)](2-)(n = 1,2),其中一个和两个pyr烯单元通过两个亚甲基桥连接到[Ru(bpy) )(CN)(4)](2-)发色团已合成。已在水,甲醇和乙腈中研究了这些系统的光物理性质,这些系统包含高度溶剂化的金属络合物部分。在所有溶剂中,迅速,有效的单重态-单重态能量转移都发生在从moiety到无机部分的过程中。另一方面,三重态水平下的能量转移显着地取决于溶剂。在水中,Ru基发色团的金属至配体电荷转移(MLCT)发射被完全淬灭,并且在超快光谱学中检测到快速(对于n = 1为200 ps)不可逆的三重态能量转移至to单元。在乙腈中 the基发色团的存在实际上不影响MLCT的发射,这意味着不存在任何组分间三重态能量转移。在甲醇中,三重态能量转移会导致激发的发色团之间达到平衡,从而大大延长了MLCT的寿命。对[Ru(Pyr(n)bpy)(CN)