• 最佳库匹配: 2-fluoro-7-nitro-9H-fluorene #25501

• Direct evidence citations attribute the 839 cm⁻¹ band to β‑phase PVDF and the 1092 cm⁻¹ band to Si–O stretching in Si₃N₄; those literature systems are incompatible with the methacrylate/ester direction and are considered inapplicable.
• The top‑1 library candidate (2‑fluoro‑7‑nitro‑9H‑fluorene) contains nitro and fluorene functionalities for which no spectral evidence (e.g., NO₂ symmetric/asymmetric stretches, fluorene C–F) is observed, arguing against its identification as the sample identity.
• The absence of a clear carbonyl band prevents definitive confirmation of an ester; a copolymer or blend with silicate/ siloxane components cannot be excluded given the silane candidates in the library.
• The exact aromatic substitution pattern remains unknown; further structural features (e.g., aromatic C–H out‑of‑plane bends) are not clearly resolved.

推荐的后续步骤: Acquire a spectrum over the full mid‑IR range (4000‑400 cm⁻¹) to capture potential carbonyl (~1720 cm⁻¹) and aromatic ring modes (~1600, 1500 cm⁻¹). Consider complementary techniques such as ¹³C NMR or pyrolysis‑GC/MS to confirm methacrylate/acrylate moieties and identify aromatic building blocks. Compare with spectra of known methacrylate copolymers (e.g., poly(methyl methacrylate) or methacrylate‑functionalized siloxanes) to further narrow the composition.