Ruthenium(II)-cored polythiophene dendrimers

Suxiang Deng; Greg Krueger; Prasad Taranekar; Saengrawee Sriwichai; Ruifa Zong; Randolph P. Thummel; Rigoberto C. Advincula

doi:10.1021/cm200228p

Ruthenium(II)-cored polythiophene dendrimers

Suxiang Deng, Greg Krueger, Prasad Taranekar, Saengrawee Sriwichai, Ruifa Zong, Randolph P. Thummel, Rigoberto C. Advincula^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal-polythiophene dendrimers investigated here are [Ru(bpy) ₂(phen3T)]²⁺, [Ru(bpy)₂(phen7T)]²⁺, [Ru(phen3T)₃]²⁺, and [Ru(phen7T)₃] ²⁺. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. The MLCT emission is extraordinarily red-shifted (∼165 nm) because of their planar excited states. The core of the dendrimers shows an electrochemical behavior typical of encapsulated metal electroactive units.

Original language	English
Pages (from-to)	3302-3311
Number of pages	10
Journal	Chemistry of Materials
Volume	23
Issue number	14
DOIs	https://doi.org/10.1021/cm200228p
Publication status	Published - 2011 Jul 26
Externally published	Yes

Keywords

dendrimers
metal-to-ligand charge transfer
oligothiophene
ruthenium

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm200228p

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title = "Ruthenium(II)-cored polythiophene dendrimers",

abstract = "We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal-polythiophene dendrimers investigated here are [Ru(bpy) 2(phen3T)]2+, [Ru(bpy)2(phen7T)]2+, [Ru(phen3T)3]2+, and [Ru(phen7T)3] 2+. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. The MLCT emission is extraordinarily red-shifted (∼165 nm) because of their planar excited states. The core of the dendrimers shows an electrochemical behavior typical of encapsulated metal electroactive units.",

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author = "Suxiang Deng and Greg Krueger and Prasad Taranekar and Saengrawee Sriwichai and Ruifa Zong and Thummel, {Randolph P.} and Advincula, {Rigoberto C.}",

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AU - Deng, Suxiang

AU - Krueger, Greg

AU - Taranekar, Prasad

AU - Sriwichai, Saengrawee

AU - Zong, Ruifa

AU - Thummel, Randolph P.

AU - Advincula, Rigoberto C.

PY - 2011/7/26

Y1 - 2011/7/26

N2 - We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal-polythiophene dendrimers investigated here are [Ru(bpy) 2(phen3T)]2+, [Ru(bpy)2(phen7T)]2+, [Ru(phen3T)3]2+, and [Ru(phen7T)3] 2+. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. The MLCT emission is extraordinarily red-shifted (∼165 nm) because of their planar excited states. The core of the dendrimers shows an electrochemical behavior typical of encapsulated metal electroactive units.

AB - We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal-polythiophene dendrimers investigated here are [Ru(bpy) 2(phen3T)]2+, [Ru(bpy)2(phen7T)]2+, [Ru(phen3T)3]2+, and [Ru(phen7T)3] 2+. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. The MLCT emission is extraordinarily red-shifted (∼165 nm) because of their planar excited states. The core of the dendrimers shows an electrochemical behavior typical of encapsulated metal electroactive units.

KW - dendrimers

KW - metal-to-ligand charge transfer

KW - oligothiophene

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Ruthenium(II)-cored polythiophene dendrimers

Abstract

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