Analysis of vibrational spectra of 3-halo-1-propanols CH2XCH2CH2OH (X is Cl and Br)

Rapid monitoring of bisphenol‒A diglycidyl ether formation through byproduct estimation: A study by Fourier transform infra‐red spectroscopy

“…Above characteristic infrared absorption frequency bands are used for detection and quantitative estimation of the above components present in the polymerizing mixture. It is also noted that the symmetric stretching of CCl bond in EP appears at 735 cm −1 due to its stable conformer,24 whereas symmetric stretching of CCl bond in Cl‐DGEBPA appears at 773 cm −1 23. Though, these frequencies are close to each other, but the transmittance peak at 773 cm −1 is sufficient for identification of CCl bond in Cl‐DGEBPA resin.…”

“…Benzene was found to be suitable solvent for standardization of EP, BPA, DGEBPA, Cl‐DGEBPA, and α‐DGEBPA in infra‐red region 10. Following characteristic infrared transmittance frequency bands of EP, BPA, DGEBPA, Cl‐DGEBPA, and α‐DGEBPA were considered for the calibration10, 20–24: EP: 925 cm −1 (in phase stretching frequency due to ring breathing vibration in EP of CC, CO, and CO bonds), BPA: 3448 cm −1 (asymmetric stretching vibration of OH group), DGEBPA: 1344 cm −1 (in phase stretching frequency due to the ring breathing vibration of CC, CO, and CO bonds in DGEBPA), Cl‐DGEBPA: 773 cm −1 (symmetric stretching of CCl bond), and α‐DGEBPA: 3641 cm −1 (OH stretching deformation in the nonbonded primary alcohol). …”

“…Due to rapid development of reliable instrumentation technique and computerized data processing facilities, now‐a‐days, Fourier transform infra‐red spectroscopy (FT‐IR) is becoming a very powerful tool for detection and quantitative estimation of compounds,16, 17 and this technique is applied for quantitative estimation of epoxy resin curing frequently 10, 18, 19. Due to the well‐defined characteristic FT‐IR transmittance peaks of EP and BPA polymerizing mixture10, 20–24 [i.e., epoxy ring (EP), glycidyl group (mono‐ and diglycidyl ether), hydroxyl group (BPA and α‐glycol), and chlorine group (Cl‐DGEBPA)], FT‐IR technique can be used for rapid reaction monitoring through identification and quantification during epoxy resin formation.…”

Coulomb explosion imaging: a robust method for distinguishing molecular structures and tracking structural changes in photochemical reactions

“…This open-chain structure is "floppy" which means that the single bonds can be rotated using very little energy, leading to the existence of multiple conformers with low energy barriers. [25][26][27] In certain cases, identifying the preferred conformation of the isolated molecule in the gas phase could be a challenge both experimentally and theoretically. 28 Our simulations show that these conformers give distinctly different momentum patterns.…”