. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. The Resolution of Crystal Lattices 89. Fig. 3. Crystal habit ofcoppcr plitlialocsanine (after Robert- son, 1934). with intermediate molecular weights. Among these the phthalocyanines appeared a promising group to study and most of our work so far has been carried out on copper and platinum phthalocyanine. The metal phthalocyanines have a number of favourable properties. The molecule of platinum phthalocyanine is shown in figure I, and the unit cell of the crystal lattice in figure 2. From thes
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956. Electron microscopy. The Resolution of Crystal Lattices 89. Fig. 3. Crystal habit ofcoppcr plitlialocsanine (after Robert- son, 1934). with intermediate molecular weights. Among these the phthalocyanines appeared a promising group to study and most of our work so far has been carried out on copper and platinum phthalocyanine. The metal phthalocyanines have a number of favourable properties. The molecule of platinum phthalocyanine is shown in figure I, and the unit cell of the crystal lattice in figure 2. From these it is apparent that we may idealise the structure into widely spaced planes of heavy metal atoms (^^o,,, A) embedded in a matrix of the light elements carbon, nitrogen and hydrogen. We would expect to obtain strong diffracted beams from these planes even in very thin crystals since the scattering from the heavy metal atoms swamps that from the organic parts of the unit cell. The crystals grow as long thin ribbons with (001) as the habit plane of the ribbon surface as shown in figure 3, so that crystals sup- ported on a specimen grid will be oriented with (001) perpendicular to the electron beam and (20T) almost. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original European Regional Conference on Electron Microscopy (1st : 1956 : Stockholm); Sjöstrand, Fritiof S. (Fritiof Stig), 1912-; Rhodin, Johannes A. G. New York : Academic Press
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