C=n — Puncak serapan FTIR dan tugasan

Jawapan pantas

C=n biasanya ditetapkan dengan mencari kelompok berulang puncak ciri dan bukan satu nombor tepat buku teks. Jadual di bawah menunjukkan di mana literatur paling kerap meletakkan kumpulan ini dalam FTIR, yang disusun mengikut bukti terkumpul.

Puncak FTIR ciri untuk C=n

Menunjukkan 30 puncak terbaik disokong daripada 227 jumlah untuk C=n.

Logik spektrum

Tugasan kumpulan berfungsi menjadi lebih yakin apabila beberapa jalur yang dijangkakan muncul bersama. Gunakan halaman ini untuk mencari puncak yang paling disokong, kemudian sahkan bahawa sampel yang sama menunjukkan corak yang koheren dan bukannya satu hit terpencil.

Penggunaan dunia sebenar

Halaman-halaman ini berguna untuk analisis bahan yang tidak diketahui, penjelasan puncak dalam laporan, penyelesaian masalah polimer, dan mengesahkan sama ada keluarga bahan calon adalah boleh dipercayai secara kimia.

Kesilapan biasa

• Menggunakan satu halaman kumpulan berfungsi sebagai keputusan bahan lengkap tanpa memeriksa spektrum yang lain.
• Dengan menganggap jalur yang paling kuat sentiasa menjadi yang paling diagnostik.
• Melupakan bahawa pemprosesan, bahan tambahan, penuaan, dan campuran boleh mengalihkan atau melebarkan puncak yang dijangkakan.

Nasihat pengesahan

Gunakan DSC, GC-MS, atau TGA apabila beberapa keluarga bahan berkongsi jalur yang serupa atau apabila kesan campuran menyebabkan tugasan FTIR tidak pasti.

Literatur di sebalik penetapan ini

• 1489 cm⁻¹ keyakinan 1.0

  “cm-1 absorbance of the IR band at 3604 The decrease of the absorbance of the IR band at 1489 indicates a -C=N-benzene smaller weight of the ring vibrational mode after the interaction of the GO sheets with PDITC, this being in good agreemen”

  Baibarac 等 - 2019 - Adsorption of 1,4-phenylene diisothiocyanate onto DOI: 10.1038/s41598-019-48314-x
• 1519 cm⁻¹ keyakinan 1.0

  “The bands centered at 1519 and 1454 are assigned to C=N stretching of quinoid and C-N stretching of benzenoid rings, respectively;”

  Synthesis of novel conducting polyaniline composites based on seaweed Enteromorpha compressa macro-alga powder DOI: 10.1007/s00289-020-03191-7
• 1627 cm⁻¹ keyakinan 1.0

  “cm-1, For quantification, absorbance of C=O stretch cantered at 1754 between wave number of 1750 - cm-1 cm-1, 1730 was selected for Aspirin and absorbance of C=N stretch cantered at 1627 between 1690 cm-1 - 1620 was used for Omeprazole.”

  Chandarana 和 Kapupara - 2020 - Fourier Transform Infrared Spectrophotometry An E DOI: 10.30744/brjac.2179-3425.AR-25-2020
• 1605 cm⁻¹ keyakinan 1.0

  “LLM confirmed rule peak-group candidate”

  Synthesis, crystal structures, quantum chemical studies and corrosion inhibition potentials of 4-(((4-ethylphenyl)imino)methyl)phenol and (E)-4-((naphthalen-2-ylimino) methyl) phenol Schiff bases DOI: 10.1016/j.molstruc.2017.06.104
• 1497 cm⁻¹ keyakinan 1.0

  “The peaks observed at 1497, 1466 and cm-1 205 1400 are attributed to C=N stretching in aromatic compounds.”

  Effect of polyaniline (PANI) on Poly(vinylidene fluoride-co-hexaflouro propylene) (PVDF-co-HFP) polymer electrolyte membrane prepared by breath figure method DOI: 10.1016/j.polymertesting.2017.03.012
• 2270 cm⁻¹ keyakinan 1.0

  “Obviously, the characteristic is interesting that the viscosity of the HTPE/HDIB system cm-1 peak height at 2270 corresponding to-N=C=O”

  Curing reaction kinetics of HTPE polymer studied by simultaneous rheometry and FTIR measurements DOI: 10.1007/s10973-016-5485-8
• 1800 cm⁻¹ keyakinan 1.0

  “cm-1 The IR absorption bands in the region between 1800 and 1500 were mainly assigned to the C=C, C=N, and C=O stretching vibrations (Banyay et al., 2003;”

  A novel FTIR discrimination based on genomic DNA for species-specific analysis of meat and bone meal DOI: 10.1016/j.foodchem.2019.05.088
• 1602 cm⁻¹ keyakinan 1.0

  “cm-1 cm-1 1086 C-N stretching in amines, 1530 C=C Authors' contributions cm-1 stretching, 1602 C=N stretching (in ring),”

  Hanif 和 Zaman - 2017 - Thiolation of arabinoxylan and its application in DOI: 10.1186/s40199-017-0172-2