Dithallium phthalocyanine ( Tl 2 Pc ) has been synthesized from pure Tl metal and o-phthalodinitrile. The isolated compound was characterized by elemental analysis, X-ray powder diffraction, electron diffraction and EDX spectroscopy. Based on these results, the compound synthesized by the present method was concluded to be Tl 2 Pc . The electrical conductivity of this powdery Tl 2 Pc was measured and it exhibited the semiconductive property, in contrast with a previous report.
The origin of an anomalous sawtooth-shaped feature in x-ray powder diffraction of solid C60 is explained via electron diffraction analysis. Films sublimed on holey carbon crystallize with close-packed (111) planes parallel to the surface. Rods of diffuse scattering are found along the 〈111〉 axis normal to the surface but not along other 〈111〉 axes. Powder averaging of these rods, coupled with the x-ray form factor of spherical shells with 3.5 Å radius, accounts for the sawtooth feature. We attribute this phenomenon to planar defects parallel to close-packed layers, which form during the growth of solid C60 by sublimation. A possibly related consequence of the growth mode is the observation of strong macroscopic (111) preferred orientation in films sublimed on a variety of substrates.
Structures of synthetic K2MgSi5O12 leucites by integrated X-ray powder diffraction, electron diffraction and 29Si MAS NMR methods