The amorphous-like carbon compound prepared by direct pyrolysis of If2-diaminopropane is found to be a stable strong magnet, the apparent saturation magnetization (M,) of which is 10.5 emu g-1 (0.022 pB per carbon atom), being comparable to ca. one-third of magnetite (Fe304, 30.7 emu g-1).
An apparent saturation magnetization (M,) of the title carbons prepared from 1,5,8,12-tetraazadodecane was found to be 2-3 times larger than those previously reported (2.56 emu 9-1; 0.005 p~ per carbon atom); the M, value is dependent on the ratio of hydrogen to carbon in the starting materials, particularly for H/C > ca. 2.There has been recent interest in the synthesis of carbon-based compounds exhibiting a spontaneous magnetization at room temperature .1-4 Our approach uses organic monomers as starting material,4 and we have now discovered a novel carbonaceous magnetic material prepared from tetraaza compounds with an apparent saturation magnetization higher than those previously reported.2-4The carbonaceous sample (aza-carbon) was prepared from the commercially available tetraaza-compound 1 or 2 according to the procedure described previously.4 The aza-compound was placed in a quartz tube, which was evacuated overnight. The tube was then heated at 950 "C and the monomer rapidly pyrolysed. The reaction time was 30 min. The tube was cooled and the resulting aza-carbon products were removed.X-Ray diffraction, laser-Raman and electron diffraction analysis of the aza-carbon showed no distinct crystalline phase, indicating an amorphous-like structure.
Electron irradiation of dilute solutions of aromatic compounds in liquid chlorinated hydrocarbon solvents results in the formation of the molecular cations of these aromatic compounds. The optical absorption spectra of the molecular cations of diphenyl, p-terphenyl, t-stilbene, and anthracene were observed by pulse-radiolysis methods, and the identity of the reactive species established from the spectra and from various scavenger effects. At room temperature the half-life of these cations in the particular solutions is on the order of a few microseconds. In solutions containing two different aromatic compounds as solutes, it was found that an electron transfer may take place between the neutral aromatic molecule of one compound and the molecular cation of the other.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.