| Popis: |
The crystal and molecular structures of two oligomeric aromatic ether-imides PhOArN(OC) 2 Ar′XAr′(CO) 2 NArOPh [X = SO 2 (4) or C(CF 3 ) 2 (5); Ar = a 1,4- and Ar′ = a 1,3,4-substituted aromatic residue] have been determined by single crystal X-ray diffraction. Crystal data for 4 , C 40 H 24 N 2 O 8 S.0.25 H 2 O: orthorhombic, Pbnm ; a = 5.628(1), b = 24.903(8), c = 47.175(17) A . Crystal data for 5 , C 43 H 24 F 6 N 2 O 6 : monoclinic, P2 1 c ; a = 6.919(1), b = 11.977(2), c = 43.203(9) A , β = 94.23(2)°. Molecules of the sulfone-bridged oligomer 4 pack in discrete chevron-like lamellae, within which complementary, parallel ring-stacking ( ∼3.5 A interplanar separation) occurs between aminophenol (NC 6 H 4 O) and arene-imide [Ar(CO) 2 NAr′] residues. In contrast, the hexafluoroisopropylidene-bridged oligomer 5 packs in a linearly displaced, non-lamellar fashion in the crystal, the structure showing no evidence for adjacent stacking of electronically complementary molecular sub-units. |
