Effects of secondary ligand and excitation on the thermally induced and photoinduced valence tautomerism semiquinonate - catecholate

Pance Naumov, Alexei A. Belik

Research output: Contribution to journalArticle

Abstract

Twelve mixed cobalt dioxolene complexes with various amines or pyridyl secondary ligands were prepared and characterized, two of which exhibit thermal valence tautomeric phase transitions. When these two complexes are excited in situ with a nanosecond Nd:YAG source (532 nm) at 10 K, the magnetization of their low temperature phases exhibits a combination of heating and photoexcitation effects. Time-dependence on the applied temperature and laser intensity of the thermal decay, concentration saturation and equilibration effects was observed for the photoinduced phase. It is concluded that laser heating effects should be explicitly accounted for when studying the low-temperature photoinduced valence tautomerism.

Original languageEnglish (US)
Pages (from-to)465-469
Number of pages5
JournalInorganic Chemistry Communications
Volume11
Issue number5
DOIs
StatePublished - May 1 2008

Fingerprint

Ligands
valence
Heating
ligands
Temperature
Lasers
Hot Temperature
excitation
Laser heating
Photoexcitation
laser heating
Phase Transition
Cobalt
photoexcitation
yttrium-aluminum garnet
time dependence
Amines
Magnetization
amines
cobalt

Keywords

  • Charge transfer
  • Ligand effects
  • Magnetic properties
  • O ligands
  • Phase transitions

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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T1 - Effects of secondary ligand and excitation on the thermally induced and photoinduced valence tautomerism semiquinonate - catecholate

AU - Naumov, Pance

AU - Belik, Alexei A.

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N2 - Twelve mixed cobalt dioxolene complexes with various amines or pyridyl secondary ligands were prepared and characterized, two of which exhibit thermal valence tautomeric phase transitions. When these two complexes are excited in situ with a nanosecond Nd:YAG source (532 nm) at 10 K, the magnetization of their low temperature phases exhibits a combination of heating and photoexcitation effects. Time-dependence on the applied temperature and laser intensity of the thermal decay, concentration saturation and equilibration effects was observed for the photoinduced phase. It is concluded that laser heating effects should be explicitly accounted for when studying the low-temperature photoinduced valence tautomerism.

AB - Twelve mixed cobalt dioxolene complexes with various amines or pyridyl secondary ligands were prepared and characterized, two of which exhibit thermal valence tautomeric phase transitions. When these two complexes are excited in situ with a nanosecond Nd:YAG source (532 nm) at 10 K, the magnetization of their low temperature phases exhibits a combination of heating and photoexcitation effects. Time-dependence on the applied temperature and laser intensity of the thermal decay, concentration saturation and equilibration effects was observed for the photoinduced phase. It is concluded that laser heating effects should be explicitly accounted for when studying the low-temperature photoinduced valence tautomerism.

KW - Charge transfer

KW - Ligand effects

KW - Magnetic properties

KW - O ligands

KW - Phase transitions

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DO - 10.1016/j.inoche.2008.01.003

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JO - Inorganic Chemistry Communication

JF - Inorganic Chemistry Communication

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