Stable ?-radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) adsorbed at the elbows of 22 x ?3 reconstructed Au(111)
Sprache des Titels:
Stable organic radicals serve as model systems for investigating metal-free magnetic phenomena at (sub)nan-ometer length scales. We have investigated at the single-molecule level the stable?-radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) adsorbed at the elbow sites of the×22 3reconstructed Au(111) surface. Low-tem-perature scanning tunneling microscopy (STM) and -spectroscopy under ultrahigh vacuum conditions at 8 Kreveal structural as well as frontier-orbital related electronic details of DPPH/Au(111). A Kondo-like spectro-scopic signature indicates preservation of the unpaired electron spin state.