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- W2005282324 abstract "2,3,9,10,16,17,23,24-Octapentoxyphthalocyanine and its nickel derivative have been studied by means of electron and X-ray powder diffraction. The results reveal that the metal-free compound forms monoclinic crystals (space group C2/c) with unit cell constants a = 4.202 nm , b = 0.4977 nm , c = 3.345 nm , β = 98.9 ° and Z = 4 molecules per unit cell. 2,3,9,10,16,17,23,24-Octapentoxyphthalocyaninatonickel(II) is likely to be isomorphous to its metal-free analogue, but occurs in a second phase which is also stable at room temperature. This is identified to be a crystalline primitive hexagonal phase with cell constants a = b = 2.50 nm and c = 0.33 nm . It is assumed that the molecules form a columnar structure along the c-axis, whereas the hexagonal cross-section in the ab-plane goes back to the molecular disc shape. Imaging of monoclinic crystals of 2,3,9,10,16,17,23,24-octapentoxyphthalocyanine in an energy-filtering transmission electron microscope (EFTEM) can be performed to resolve 2 nm structures only, owing to specimen damage. According to the diffraction pattern, the micrograph provides a view along [001] and shows directly that the structure can be described in terms of parallel columnar stacks of molecules along the b-axis, the distance between neighbouring stacks being [Formula: see text]. The results show that the structures of both the metal-free compound and its nickel analogue are dominated by π–π interactions between the macrocycles, which is a marked difference from the structures of 1,4,8,11,15,18,22,25-octasubstituted phthalocyanines." @default.
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- W2005282324 date "2000-01-01" @default.
- W2005282324 modified "2023-09-27" @default.
- W2005282324 title "Unit cell determination of 2,3,9,10,16,17,23,24- octapentoxyphthalocyanine and its nickel derivative using electron and X-ray powder diffraction" @default.
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- W2005282324 doi "https://doi.org/10.1002/(sici)1099-1409(200001/02)4:1<10::aid-jpp154>3.0.co;2-a" @default.
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