Abstract
Tetraphenylphthalic anhydride has been structurally characterized by X-ray crystallography: triclinic,P¯1,a=13.386(4),b=13.563(4),c=16.185(6) A,α=71.70(3),β=109.32(3), λ=116.17(3)°,V=2439(1) A3,Z=4,Dx=1.23 g cm−3,μ=0.73 cm−1,T=295 K, andR=0.065 for 3910 observed reflections. The asymmetric unit consists of two crystallographically independent molecules of tetraphenylphthalic anhydride (TPPA). Crowding from four adjacent phenyl substituents produces large average displacements of the substituents from the central ring (av. ~0.08 A, max. 0.17 A) and distortions in the central aromatic ring. The torsion angles relating the plane of the substituent phenyl rings to the central ring plane (av. ∼62°) is consistent with other polyphenylated aromatic structures.
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