Photophysics and acid-base chemistry of Re(CH3bpyCOOH)(CO) 3X (X=CI-, and imidazole) complexes

Ren Jay Lin, I-Jy Chang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Rhenium tricarbonyl (4′-methyl-2,2′-bipyridine-4-carboxylic acid) X (where X is Cl- and imidazole) complexes have been prepared. These two complexes exhibit similar spectroscopic properties. The metal-to-ligand charge-transfer (MLCT) absorption and the corresponding emission are observed. This charge transfer band is highly solvent dependent. Due to the stronger electron-withdrawing ability of the -COOH (in comparison to the -COO- group), the MLCT band has red-shifted during protonation. Emission quantum yields are dramatically reduced while lifetime remains similar upon protonation. These behaviors are typical in static quenching mechanism by protons. The ground state pKa of Re(CO)3(CH 3bbpyCOOH)Cl obtained from the pH titration curve of the complex absorption at 409 nm was 2.5.

Original languageEnglish
Pages (from-to)161-164
Number of pages4
JournalJournal of the Chinese Chemical Society
Volume49
Issue number2
DOIs
Publication statusPublished - 2002 Jan 1

Fingerprint

Charge transfer
Protonation
Acids
Metals
Rhenium
Ligands
Quantum yield
Carboxylic Acids
Titration
Ground state
Protons
Quenching
Electrons
imidazole
carboxyl radical

Keywords

  • Acid-base
  • Electronic excited-states
  • Rhenium tricarbonyl diimine complexes

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Photophysics and acid-base chemistry of Re(CH3bpyCOOH)(CO) 3X (X=CI-, and imidazole) complexes. / Lin, Ren Jay; Chang, I-Jy.

In: Journal of the Chinese Chemical Society, Vol. 49, No. 2, 01.01.2002, p. 161-164.

Research output: Contribution to journalArticle

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N2 - Rhenium tricarbonyl (4′-methyl-2,2′-bipyridine-4-carboxylic acid) X (where X is Cl- and imidazole) complexes have been prepared. These two complexes exhibit similar spectroscopic properties. The metal-to-ligand charge-transfer (MLCT) absorption and the corresponding emission are observed. This charge transfer band is highly solvent dependent. Due to the stronger electron-withdrawing ability of the -COOH (in comparison to the -COO- group), the MLCT band has red-shifted during protonation. Emission quantum yields are dramatically reduced while lifetime remains similar upon protonation. These behaviors are typical in static quenching mechanism by protons. The ground state pKa of Re(CO)3(CH 3bbpyCOOH)Cl obtained from the pH titration curve of the complex absorption at 409 nm was 2.5.

AB - Rhenium tricarbonyl (4′-methyl-2,2′-bipyridine-4-carboxylic acid) X (where X is Cl- and imidazole) complexes have been prepared. These two complexes exhibit similar spectroscopic properties. The metal-to-ligand charge-transfer (MLCT) absorption and the corresponding emission are observed. This charge transfer band is highly solvent dependent. Due to the stronger electron-withdrawing ability of the -COOH (in comparison to the -COO- group), the MLCT band has red-shifted during protonation. Emission quantum yields are dramatically reduced while lifetime remains similar upon protonation. These behaviors are typical in static quenching mechanism by protons. The ground state pKa of Re(CO)3(CH 3bbpyCOOH)Cl obtained from the pH titration curve of the complex absorption at 409 nm was 2.5.

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