Distant ultrafast energy transfer in a trimetallic {Ru-Ru-Cr} complex facilitated by hole delocalization

被引：14

作者：

Cadranel, Alejandro ^{[1
]}

Tate, Jaired E. ^{[2
]}

Oviedo, Paola S. ^{[1
]}

Yamazaki, Shiori ^{[2
]}

Hodak, Jose H. ^{[1
]}

Baraldo, Luis M. ^{[1
]}

Kleiman, Valeria D. ^{[2
]}

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, INQUIMAE, Dept Quim Analit Inorgan & Quim Fis, Pabellon 2,Ciudad Univ,C1428EHA, Buenos Aires, DF, Argentina

[2] Univ Florida, Dept Chem, POB 117200, Gainesville, FL 32611 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2017年 / 19卷 / 04期

基金：

美国国家科学基金会;

关键词：

RUTHENIUM(II) POLYPYRIDYL COMPLEXES; CHROMOPHORE LUMINOPHORE COMPLEXES; EXCITED-STATE PROPERTIES; PHOTOPHYSICAL PROPERTIES; ELECTRON-TRANSFER; METAL-COMPLEXES; MOLECULAR ASSEMBLIES; CYANIDE BRIDGE; GROUND-STATE; DYNAMICS;

D O I：

10.1039/c6cp06562g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Multi-metallic complexes based on {Ru-Cr}, {Ru-Ru} and {Ru-Ru-Cr} fragments are investigated for their light-harvesting and long-range energy transfer properties. We report the synthesis and characterization of [Ru(tpy)(bpy)(mu-CN)Ru(py)(4)Cl](2+) and [Ru(tpy)(bpy)(mu-CN)Ru(py)(4)(mu-NC)Cr(CN)(5)]. The intercalation of {Ru-II(py)(4)} linked by cyanide bridges between {Ru(tpy)(bpy)} and {Cr(CN)(5)} results in efficient, distant energy transfer followed by emission from the Cr moiety. Characterization of the energy transfer process based on photophysical and ultrafast time-resolved absorption suggests the delocalization of holes in the excited state, providing a pathway for energy transfer between the end moieties. The proposed mechanism opens the door to utilize this family of complexes as an appealing platform for the design of antenna compounds as the properties of the fragments could be tuned independently.

引用

页码：2882 / 2893

页数：12

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