After a four-year hiatus, the powerhouse K-pop septet* BTS has returned with a new album, “Arirang,” a raucous* test of its creative mettle* amid rapidly changing genre norms.
時隔四年，實力強勁的韓國流行音樂七人組合 BTS 攜新專輯《阿里郎》回歸，這張專輯在快速變化的音樂類型規範中，對他們的創作實力進行了一次激烈的考驗。septet
/sɛpˈtɛt/
noun
- a group of seven people playing music or singing together.
- a composition for a septet.
raucous
/ˈrɔːkəs/
adjective
- making or constituting a disturbingly harsh and loud noise."raucous youths"
mettle
/ˈmɛtl/
noun
- a person's ability to cope well with difficulties; spirit and resilience."the team showed their true mettle in the second half"
在化學中，七重峰是指核磁共振波譜中出現的七線分裂訊號，顯示一個質子與六個等價的相鄰質子相鄰（
，根據
規則）。這些譜線具有特徵性的強度比 1:6:15:20:15:6:1。這常見於異丙基（例如，2-溴丙烷或異丙醇），其中 CH 質子被兩個相鄰的甲基（6 個質子）分裂。
Chemistry LibreTexts +2
七重峰的關鍵面向：核磁共振訊號的多重性：七重峰是一種多重峰，它是 1H-NMR 譜中分裂的訊號，顯示存在自旋-自旋耦合。
n+1 規則：如果一個原子核與六個等價的自旋相鄰（
），則信號將分裂成
條譜線。
強度比：根據帕斯卡三角形，這七條譜線的強度比為 1:6:15:20:15:6:1。
常見例子：與異丙基相連的碳原子上的質子通常呈現七重態。
其他語境：在一些較高級、較不常見的應用中，它也可以指具有六個未配對電子的狀態，即七重態基態。AI Overview
A septet in chemistry is a 7-line split signal in NMR spectroscopy, indicating a proton is adjacent to six equivalent neighboring protons (
, using the
rule). The lines have a characteristic 1:6:15:20:15:6:1 intensity ratio. This is commonly seen in isopropyl groups (e.g., in 2-bromopropane or isopropyl alcohol), where the CH proton is split by two neighboring methyl groups (6 protons).
Chemistry LibreTexts +2
Key Aspects of a Septet:NMR Signal Multiplicity: The septet is a type of multiplet, which is a split signal in 1H-NMR spectrum indicating the presence of spin-spin coupling.
n+1 Rule: If a nucleus is adjacent to six equivalent spins (
), the signal will split into
lines.
Intensity Ratio: Due to Pascal's triangle, the intensity ratio of the seven lines is 1:6:15:20:15:6:1.
Common Example: The proton on the carbon atom connected to a isopropyl group often appears as a septet.
Other Contexts: In advanced, less common applications, it can refer to a state with six unpaired electrons, known as a septet ground state.
13.6: Spin-Spin Splitting in ¹H NMR SpectraOct 3, 2024 — * In the 1H NMR spectra we've seen thus far, each different kind of proton in a molecule has given rise to a single peak. It often...
Chemistry LibreTexts
NMR - Interpretation - Chemistry LibreTextsJan 29, 2023 — Spin-Spin Splitting. Spin-Spin splitting means that an absorbing peak is split by more than one “neighbor” proton. Splitting signa...
Chemistry LibreTexts
Illustrated Glossary of Organic Chemistry - SeptetIllustrated Glossary of Organic Chemistry - Septet. Septet: In NMR spectroscopy, a split signal composed of seven lines, close tog...
www.chem.ucla.edu
Show all
A septet in chemistry is a 7-line split signal in NMR spectroscopy, indicating a proton is adjacent to six equivalent neighboring protons (, using the rule). The lines have a characteristic 1:6:15:20:15:6:1 intensity ratio. This is commonly seen in isopropyl groups (e.g., in 2-bromopropane or isopropyl alcohol), where the CH proton is split by two neighboring methyl groups (6 protons). Chemistry LibreTexts +2Key Aspects of a Septet:NMR Signal Multiplicity: The septet is a type of multiplet, which is a split signal in 1H-NMR spectrum indicating the presence of spin-spin coupling.
n+1 Rule: If a nucleus is adjacent to six equivalent spins (
), the signal will split into lines.Intensity Ratio: Due to Pascal's triangle, the intensity ratio of the seven lines is 1:6:15:20:15:6:1.
Common Example: The proton on the carbon atom connected to a isopropyl group often appears as a septet.
Other Contexts: In advanced, less common applications, it can refer to a state with six unpaired electrons, known as a septet ground state.
13.6: Spin-Spin Splitting in ¹H NMR SpectraOct 3, 2024 — * In the 1H NMR spectra we've seen thus far, each different kind of proton in a molecule has given rise to a single peak. It often...
Chemistry LibreTexts
NMR - Interpretation - Chemistry LibreTextsJan 29, 2023 — Spin-Spin Splitting. Spin-Spin splitting means that an absorbing peak is split by more than one “neighbor” proton. Splitting signa...
Chemistry LibreTexts
Illustrated Glossary of Organic Chemistry - SeptetIllustrated Glossary of Organic Chemistry - Septet. Septet: In NMR spectroscopy, a split signal composed of seven lines, close tog...
www.chem.ucla.edu
Show all
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