Synthesis of fluorinated ReCI(4,4′-R 2-2,2′- bipyridine)(CO) 3 complexes and their photophysical characterization in CH 3CN and supercritical CO 2

Mark D. Doherty, David Grills, Etsuko Fujita

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28 Citations (Scopus)

Abstract

Two new CO 2-soluble rhenium(l) bipyridine complexes bearing the fluorinated alkyl ligands 4,4′-(C 6F 13CH 2CH 2CH 2) 2-2,2′-bipyridine (1a), and 4,4′-(C 8F 17CH 2CH 2CH 2) 2-2,2′-bipyridine (1b) have been prepared and their photophysical properties investigated in CH 3CN and supercritical C0 2. Electrochemical and spectroscopic characterization of these complexes in CH 3CN suggests that the three methylene units effectively insulate the bipyridyl rings and the rhenium center from the electron-withdrawing effect of the fluorinated alkyl chains. Reductive quenching of the metal-to-ligand charge-transfer excited states with triethylamine reveals quenching rate constants in supercritical C0 2 that are only 6 times slower than those in CH 6CN.

Original languageEnglish
Pages (from-to)1796-1798
Number of pages3
JournalInorganic Chemistry
Volume48
Issue number5
DOIs
Publication statusPublished - Mar 2 2009

Fingerprint

Rhenium
Carbon Monoxide
Quenching
Bearings (structural)
rhenium
methylidyne
Ligands
2,2'-Dipyridyl
synthesis
quenching
Excited states
Charge transfer
Rate constants
ligands
Metals
methylene
Electrons
charge transfer
rings
metals

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "Synthesis of fluorinated ReCI(4,4′-R 2-2,2′- bipyridine)(CO) 3 complexes and their photophysical characterization in CH 3CN and supercritical CO 2",
abstract = "Two new CO 2-soluble rhenium(l) bipyridine complexes bearing the fluorinated alkyl ligands 4,4′-(C 6F 13CH 2CH 2CH 2) 2-2,2′-bipyridine (1a), and 4,4′-(C 8F 17CH 2CH 2CH 2) 2-2,2′-bipyridine (1b) have been prepared and their photophysical properties investigated in CH 3CN and supercritical C0 2. Electrochemical and spectroscopic characterization of these complexes in CH 3CN suggests that the three methylene units effectively insulate the bipyridyl rings and the rhenium center from the electron-withdrawing effect of the fluorinated alkyl chains. Reductive quenching of the metal-to-ligand charge-transfer excited states with triethylamine reveals quenching rate constants in supercritical C0 2 that are only 6 times slower than those in CH 6CN.",
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T1 - Synthesis of fluorinated ReCI(4,4′-R 2-2,2′- bipyridine)(CO) 3 complexes and their photophysical characterization in CH 3CN and supercritical CO 2

AU - Doherty, Mark D.

AU - Grills, David

AU - Fujita, Etsuko

PY - 2009/3/2

Y1 - 2009/3/2

N2 - Two new CO 2-soluble rhenium(l) bipyridine complexes bearing the fluorinated alkyl ligands 4,4′-(C 6F 13CH 2CH 2CH 2) 2-2,2′-bipyridine (1a), and 4,4′-(C 8F 17CH 2CH 2CH 2) 2-2,2′-bipyridine (1b) have been prepared and their photophysical properties investigated in CH 3CN and supercritical C0 2. Electrochemical and spectroscopic characterization of these complexes in CH 3CN suggests that the three methylene units effectively insulate the bipyridyl rings and the rhenium center from the electron-withdrawing effect of the fluorinated alkyl chains. Reductive quenching of the metal-to-ligand charge-transfer excited states with triethylamine reveals quenching rate constants in supercritical C0 2 that are only 6 times slower than those in CH 6CN.

AB - Two new CO 2-soluble rhenium(l) bipyridine complexes bearing the fluorinated alkyl ligands 4,4′-(C 6F 13CH 2CH 2CH 2) 2-2,2′-bipyridine (1a), and 4,4′-(C 8F 17CH 2CH 2CH 2) 2-2,2′-bipyridine (1b) have been prepared and their photophysical properties investigated in CH 3CN and supercritical C0 2. Electrochemical and spectroscopic characterization of these complexes in CH 3CN suggests that the three methylene units effectively insulate the bipyridyl rings and the rhenium center from the electron-withdrawing effect of the fluorinated alkyl chains. Reductive quenching of the metal-to-ligand charge-transfer excited states with triethylamine reveals quenching rate constants in supercritical C0 2 that are only 6 times slower than those in CH 6CN.

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