What absorbs at 740 cm⁻¹ in an FTIR spectrum?
A band near 740 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
빠른 답변
A band near 740 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
가능한 작용기 할당
| 작용기 | 지원 사실 | 인용 출처 | 최고 신뢰도 |
|---|---|---|---|
| Alkyl C-H | 7 | 7 | 1.0 |
| Aromatic ring | 5 | 5 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Fatty acid | 2 | 2 | 1.0 |
| Ester | 2 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Guanidine core | 1 | 1 | 1.0 |
| Metal oxo | 1 | 1 | 0.9 |
| Metal oxygen | 1 | 1 | 0.9 |
순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.
스펙트럼 로직
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 740 cm⁻¹ is usually not enough for material identification by itself.
실제 사용
이러한 유형의 질의는 고분자 식별, 미지 플라스틱 스크리닝, QC 문제 해결, 재활용 재료 검증 및 문헌 기반 피크 할당 검토에서 일반적입니다.
일반적인 실수
- 하나의 고립된 밴드를 재료의 증거로 취급하고 최소 하나 또는 두 개의 지원 피크를 확인하지 않는 것.
- 겹침 무시: 여러 작용기가 동일한 파수 근처에서 기여할 수 있습니다.
- 첨가제, 혼합물, 산화 또는 오염이 스펙트럼을 왜곡할 수 있는 경우 검증을 건너뜁니다.
검증 조언
모호성이 남아 있는 경우, 특히 혼합물, 분해된 시료 및 충전 폴리머의 경우 DSC, GC-MS 또는 TGA로 가설을 검증하십시오.
이 할당의 배경이 되는 문헌
-
Guanidine core 신뢰도 1.0
“The guanidine peak is lower compared to 740 between modifi ed and untreated materials in relation to others.”
Uner 等 - 2016 - Wood Waste Turned Into Value Added Products Therm DOI: 10.5552/drind.2016.1534 -
Fatty acid 신뢰도 1.0
“3 cm-1 2,800 and of the C = O absorption around 1,740 cm-1 was found to slightly increase, while the complex Fatty acid quantification by gas chromatography cm-1 absorption between 1,250 and 1,000 GC is the most used technique to evaluate l”
Ami 等 - 2014 - Fourier transform infrared spectroscopy as a metho DOI: 10.1186/1754-6834-7-12 -
Fatty acid 신뢰도 1.0
“Infact, theester 1,740cm-1 in our experiments are most The response of the fatty acid ester bands in the same experiment band maxima at around (Figure 3B) likely representativeof asituationin which thesolventenvironment is coherent with thi”
Baserga 等 - 2022 - Membrane Protein Activity Induces Specific Molecul DOI: 10.3389/fmolb.2022.915328 -
Hydroxyl (O-H) 신뢰도 1.0
“1442 and 1352 to the regions under 830 According to Liang, Marchessault Liang and Marchessault cm-1 [31, 32], these regions correspond to the O-H bending [31] suggested that the regions near 740 and 800 cm-1) in-plane vibration (1442 and th”
Rapid estimation of sugar release from winter wheat straw during bioethanol production using FTIR-photoacoustic spectroscopy DOI: 10.1186/s13068-015-0267-2 -
Ring structure 신뢰도 1.0
“cm(cid:2)1 ThespectrumofO.Xappliiessentialoil(Figure3E)depictsfingerprint -CH 943 [14,15], 804 (TOH out of plane vibration) [14, 15] cm(cid:2)1 Carvat1254,1175,1116,995,937,864and813cm(cid:2)1[14,15] peaksof and 740 (TOH phenolic ring vibra”
Detection of carvacrol in essential oils by electrochemical polymerization DOI: 10.1016/j.heliyon.2020.e03714 -
Alkyl C-H 신뢰도 1.0
“1E, 1F) record the appearcm-1 cm-1), and 1,660 aroC=O stretching (around 1,740 cm-1, cm-1, 780 and ance of some absorption peaks at 1,318 cm-1), and C-H matic ring skeleton vibration (around 1,545”
Ch'ng 等 - 2016 - Vasorelaxation Study and Tri-Step Infrared Spectro DOI: 10.3831/KPI.2016.19.016 -
Ring structure 신뢰도 1.0
“At 670 °C, the degradation of the PI-2 occurs and in the FTIR spectrum, it can be observed only at the following absorption bands: 3430 cm-1 (-OH), 1584 cm-1 (C=C), 1445 cm-1 (P-Ar), 1384 cm-1 (C-H), 1117 cm-1 (P=O), 987 cm-1 (P-O-Ar) and 7”
Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units DOI: 10.3390/ijms232113174 -
Aromatic ring 신뢰도 1.0
“(1996) claimed that stronger 3 740cm-1) ] and SNS at around the peak of benzene ring interaction between ether groups and cations causes a larger s cm-1).”
Kim 等 - 2020 - Lithium Salt Dissociation in Diblock Copolymer Ele DOI: 10.3389/fenrg.2020.569442
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FTIR 스펙트럼을 업로드하면 몇 초 안에 전체 해석 보고서(문헌 인용이 포함된 피크 할당, 라이브러리 매칭, 신뢰도 평가 증거 체인)를 받을 수 있습니다.