ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Single crystals of the black 1:2 donor–acceptor complex of phenothiazine with pyromellitic dianhydride, PTZ:(PMDA)2, were grown by plate sublimation at ∼163 °C from the zone-refined components. The l:1 complex is produced at lower temperatures. Crystals of the 1:2 complex are monoclinic, P21/c, Z=4, a=7.689(3), b=12.953(5), c=28.14(2) A(ring), β=104.30(2)° at T=19 °C. The structure was refined from 2863 x-ray diffraction reflection intensities for which I〉2.0σ(I) to R=0.064 and Rw=0.057. The structure consists of continuous ... DADA ... polar stacks as does the l:1 complex, but the stacks, which are parallel to the a axis, are separated in the c direction by the extra PMDA molecule. The overlap of adjacent molecules in the stack in the 1:2 complex is more closely related to the overlap of adjacent molecules in the π-molecular complex of PMDA with anthracene. The resultant angle between the stack axis and the normal to the planar molecules is 27.1°. The geometry of the individual molecules in the l:2 complex is not significantly different from those in the l:1 complex.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.448427
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