Photolysis of Naphthol Green B in Aqueous Solution. Photoreduction of Fe(III) Induced by Ligand-to-Metal Charge Transfer Excitation

2003 ◽  
Vol 58 (9) ◽  
pp. 922-924 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Quantum Yield ◽  
Metal Charge ◽  
Long Wavelength ◽  
Mlct Transition ◽  
Wavelength Absorption ◽  
Charge Transfer Excitation ◽  
Naphthol Green B ◽  
Metal Charge Transfer

The intense long-wavelength absorption of Naphthol Green B at λmax = 712 nm is assigned to a ligand-to-metal charge transfer (MLCT) transition. LMCT excitation of the complex in aqueous solution leads to the reduction of Fe(III) to Fe(II) with a quantum yield of ϕ = 1.14×10−3 at λirr = 577 nm.

Photoreactivity of Titanocene Pentasulfide

1998 ◽  
Vol 53 (2) ◽  
pp. 224-226 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Charge Transfer ◽  
Electronic Spectrum ◽  
Elemental Sulfur ◽  
Reductive Elimination ◽  
Metal Charge ◽  
Long Wavelength ◽  
Wavelength Absorption ◽  
Metal Charge Transfer

Abstract The electronic spectrum of Cp2TiS5 shows a long-wavelength absorption at λ max = 492 nm which is assigned to the lowest-energy S52- → TiIV ligand-to-metal charge transfer (LMCT) transition. The photolysis of the complex in CH2CI2 leads to the formation of Cp2TiCl2 and elemental sulfur. It is suggested that LMCT excitation initiates a reductive elimination with the extrusion of S5 while the reduced titanocene is reoxidized by the solvent.

scholarly journals Notizen: Photoredox Reaction of [Hg(cyclam)]2+[Co(CO)4]⁻ Induced by Outer Sphere Charge Transfer Excitation

1993 ◽  
Vol 48 (3) ◽  
pp. 397-398 ◽  
Author(s):  
Horst Kunkely ◽  
Arnd Vogler
Keyword(s):  
Charge Transfer ◽  
Outer Sphere ◽  
Ion Pair ◽  
Metal Charge ◽  
Charge Transfer Excitation ◽  
Metal Charge Transfer

The ion pair [Hg(cyclam)]2+[Co(CO)4]- displays a Co(–I) to Hg(II) metal-to-metal charge transfer (MMCT) band at 288 nm. Upon MMCT excitation the ion pair undergoes a photoconversion to [HgCO2(CO)8].

Photochemical transformation of an iron(iii)–arsenite complex in acidic aqueous solution

2016 ◽  
Vol 15 (3) ◽  
pp. 431-439 ◽  
Author(s):  
Ivan P. Pozdnyakov ◽  
Wei Ding ◽  
Jing Xu ◽  
Long Chen ◽  
Feng Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Transformation ◽  
Acidic Aqueous Solution ◽  
Metal Charge ◽  
Metal Charge Transfer

An Fe(iii)–As(iii) complex was characterized by UV/Vis spectra and its laser flash photolysis via ligand-to-metal charge transfer resulted in the intermediate of Fe(ii)–As(iv).

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