170471-06-4Relevant academic research and scientific papers
Effects of an axial amino ligand on the spectroscopic and electrochemical properties of amino(methoxo)-(tetraphenylporphyrinato)antimony(V) complexes
Tsunami, Shin-Ichiro,Tanaka, Kousuke,Matsumoto, Jin,Shiragami, Tsutomu,Yasuda, Masahide
experimental part, p. 583 - 589 (2009/04/11)
We investigated the effects of an axial amino ligand on the spectroscopic and electrochemical properties of alkylamino(methoxo)(tetraphenylporphyrinato) antimony(V) bromide 1 and anilino(methoxo)(tetraphenylporphy-rinato)antimony(V) bromide 2. Fluorescence measurements of 1 and 2 showed that their fluorescence quantum yields were lower than that of dihydroxo(tetraphenylporphyrinato) antimony(V) bromide (3) due to intramolecular electron transfer (ET) from the axial amino ligand to the excited porphyrin ring. Fluorescence was enhanced by the addition of a proton, which was caused by the protonation of the axial nitrogen atom, thereby preventing ET. From the titration curves of fluorescence quantum yield (φf)versus proton concentration, we estimated the acid dissociation constants (pKa) for the conjugate acid of the axial amino ligand of 1 to be 4.41-5.03. The reduction potentials (E 1/2red) of 2 depended strongly on the electronic effect of the p-substituents (X) on the axial aniline group whereas the E 1/2red methoxo(p-substituted-phenoxo) (tetraphenylporphyrinato)antimony(V) bromide was little affected by the p-substituents on the phenoxo ligand. These observations were interpreted as reflecting the participation of the axial amino ligand in the LUMO, calculated for 2 by the PM3 method.
Water-soluble porphyrin easily derived from tetraphenylporphyrin: alkyloxo(methoxo)porphyrinatoantimony bromides
Matsumoto, Jin,Shiragami, Tsutomu,Yasuda, Masahide
, p. 886 - 887 (2008/12/22)
In order to develop water-soluble porphyrins, alkyloxo-(methoxo) porphyrinatoantimony bromides (alkyl = decyl, dodecyl, and octadecyl) were prepared. These complexes have more than 200 mg/100 g of solubility in aqueous solution. From the analysis of absor
