Information card for entry 7227001

Structure parameters

• Common name: siprobichroman dianhydride
• Chemical name: 4,4,4',4'-tetramethyl-3,3',4,4'-tetrahydro-2,2'-spirobi[furo[3,4-g]chromene]-6,6',8,8'-tetraone
• Formula: C25 H20 O8
• Calculated formula: C25 H20 O8
• SMILES: O1c2cc3C(=O)OC(=O)c3cc2C(CC21Oc1c(C(C2)(C)C)cc2C(=O)OC(=O)c2c1)(C)C
• Title of publication: A strategy for preparing spirobichroman dianhydride from bisphenol A and its resulting polyimide with low dielectric characteristic
• Authors of publication: Tang, I-Chun; Wang, Meng Wei; Wu, Chien-Hsin; Dai, Shenghong A.; Jeng, Ru-Jong; Lin, Ching_Husuan
• Journal of publication: RSC Adv.
• Year of publication: 2016
• a: 26.146 ± 0.002 Å
• b: 10.396 ± 0.0005 Å
• c: 20.1104 ± 0.0016 Å
• α: 90°
• β: 127.778 ± 0.012°
• γ: 90°
• Cell volume: 4320.5 ± 0.9 ų
• Cell temperature: 150 ± 2 K
• Ambient diffraction temperature: 150 ± 2 K
• Number of distinct elements: 3
• Space group number: 15
• Hermann-Mauguin space group symbol: C 1 2/c 1
• Hall space group symbol: -C 2yc
• Residual factor for all reflections: 0.0883
• Residual factor for significantly intense reflections: 0.0529
• Weighted residual factors for significantly intense reflections: 0.1014
• Weighted residual factors for all reflections included in the refinement: 0.1176
• Goodness-of-fit parameter for all reflections included in the refinement: 1.024
• Diffraction radiation probe: x-ray
• Diffraction radiation wavelength: 0.71073 Å
• Diffraction radiation type: MoKα
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No