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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Triphenylphosphine-based functional porous polymer as an efficient heterogeneous catalyst for the synthesis of cyclic carbonates from CO2

Fig. 2

FT-IR spectra of (a) TPDB, (b) TPDB-BP, and (c) TPDB-BP-TEA. The distinct bands corresponding to the P–C=C (1674 cm−1) in PPh3 and aromatic ring stretching vibrations (1603–1438 cm−1), as well as to the stretching vibrations of C−H in aromatic ring (916, 880, 745, 720, and 690 cm−1) indicates the presence of both PPh3 and DB groups in TPDB. TPDB-PA shows a moderate intensity broad absorption band at 3378 cm−1, which is corresponding to the stretching vibration of the –OH. After further modified by TEA, the intensity of –OH vibration at 3351 cm−1 for TPDB-BP-TEA significantly increased. Besides, the new bands appeared at 1062 and 1030 cm−1 are assigned to the stretching vibrations of C–N and C–O in TEA, respectively

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