Domanda del libro di testo
The IR and mass spectra for three different compounds are shown below. Identify each compound.
c. <IMAGE>
895
views
Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Tutti i libri di testo
Bruice 8th EditionCh. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis SpectroscopyProblema 72b
Bruice 8th EditionCh. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis SpectroscopyProblema 72bCapitolo 13, Problema 72b
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
b. 
Guida verificata passo dopo passo1
Step 1: Analyze the structures of compounds A and B. Compound A contains an amine group (-NH2) attached to a conjugated system, while compound B contains a protonated amine group (-NH3+) attached to the same conjugated system. The protonation state of the amine group affects the electronic environment of the conjugated system.
Step 2: Understand the principle of UV spectroscopy. UV spectroscopy measures the absorption of ultraviolet light by a molecule, which is influenced by the electronic transitions in conjugated systems. The presence of electron-donating or electron-withdrawing groups can shift the absorption maximum (λmax).
Step 3: Consider the effect of the amine group (-NH2) in compound A. The -NH2 group is an electron-donating group, which increases the electron density in the conjugated system. This typically results in a bathochromic shift (red shift) of the λmax, meaning the absorption occurs at a longer wavelength.
Step 4: Consider the effect of the protonated amine group (-NH3+) in compound B. The -NH3+ group is an electron-withdrawing group due to its positive charge. This decreases the electron density in the conjugated system, leading to a hypsochromic shift (blue shift) of the λmax, meaning the absorption occurs at a shorter wavelength.
Step 5: Use UV spectroscopy to distinguish between the two compounds. Measure the λmax for both compounds. Compound A will have a longer λmax due to the electron-donating -NH2 group, while compound B will have a shorter λmax due to the electron-withdrawing -NH3+ group. This difference in λmax can be used to identify and distinguish between the two compounds.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
UV Spectroscopy Principles
UV spectroscopy is a technique that measures the absorption of ultraviolet light by molecules. When a molecule absorbs UV light, electrons are excited from a ground state to a higher energy state. The specific wavelengths of light absorbed can provide information about the electronic structure of the molecule, allowing for differentiation between compounds based on their functional groups and conjugation.
Video consigliato:
Percorso guidato
2:56
The UV-Vis Spectroscopy Concept 1
Functional Groups and Their Effects
Different functional groups in organic compounds can significantly influence their UV absorption characteristics. For instance, amino groups (–NH2) and ammonium groups (–NH3+) have distinct electronic properties. The presence of a positive charge in ammonium can lead to different electronic transitions compared to neutral amino groups, affecting the UV spectrum and enabling differentiation between compounds A and B.
Video consigliato:
02:36Identifying Functional Groups
Conjugation and Electron Delocalization
Conjugation refers to the overlap of p-orbitals across adjacent double bonds or lone pairs, allowing for electron delocalization. This delocalization lowers the energy gap between the ground and excited states, resulting in absorption of longer wavelengths of UV light. The degree of conjugation in compounds A and B will affect their UV spectra, making it a key factor in distinguishing between them.
Video consigliato:
05:29Definition of Conjugation
Pratica correlata
Domanda del libro di testo
Each of the IR spectra shown below is the spectrum of one of the following compounds. Identify the compound that produced each spectrum.
a. <IMAGE>
1159
views
Domanda del libro di testo
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
a.
1164
views
Domanda del libro di testo
Each of the IR spectra shown below is the spectrum of one of the following compounds. Identify the compound that produced each spectrum.
b. <IMAGE>
1640
views
Domanda del libro di testo
How can you use UV spectroscopy to distinguish between the compounds in each of the following pairs?
c.
1720
views