TAILIEUCHUNG - Lecture Organic chemistry - Chapter 10: Nuclear magnetic resonance (NMR) spectroscopy

Lecture Organic chemistry - Chapter 10: Nuclear magnetic resonance (NMR) spectroscopy. In this chapter, the following content will be discussed: What is spectroscopy? General spectrometer, the chemical shift δ, complex splitting patterns,.and other contents. | Chapter 10: Nuclear Magnetic Resonance (NMR) Spectroscopy What is spectroscopy? Molecular response to radiative stimulus is quantized (“geared”). (Molecule = nuclei + electrons). Excitation: 1. Electronic (UV-visible spectra) 2. Vibrational (IR) 3. Rotation (microwave) 4. Nuclear spin orientation in magnet (NMR) Spectrometer scans ν to find ΔE : The spectrum ΔE = hν ν = c/λ Excitation causes an “absorption”, a peak in a graph A General Spectrometer kcal mol-1 What is ∆E in NMR? Nuclei behave as tiny magnets (random orientation). In a magnetic field H0, they organize with (α, lower energy) or against (β, higher energy) the field. ∆E = hν0 resonance frequency: The frequency that matches exactly the energy difference. Protons as Tiny Magnets Line Up With and Against an External Magnetic Filed Ratio α:β ~ 1:1 Absorption of Light, Spin Flip, and Resonance Spectral Line ν0 is proportional to H0. (ν0 is specific for element/isotope) For 1H: at H0 = 21,150 gauss, ν0 = 90 MHz. ∆E (300 MHz) ~

• Hoá học
• Organic chemistry
• Lecture Organic chemistry
• Hóa học hữu cơ
• Bài giảng Hóa học hữu cơ
• Nuclear magnetic resonance
• General spectrometer
• In this workbook
• experiments are elaborated using small scale glassware and equipments from a Small Lab Kit
• developed at the Department of Chemistry
• Faculty of Science
• Chulalongkorn University in Thailand
• This Small Lab Kit was created as a result of the research project entitled “Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” sponsored by Thai Research Fund (RDG 3 07 2543)
• One of the outcomes of this project is the organic laboratory book entitled “Organic Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” written in Thai by professors from 7 universities in this project
• They compiled
• adjusted and tested the experiments taken from several traditional organic chemistry laboratory books using the prototype of Small Lab Kit
• Currently
• some selected experiments from this Thai organic chemistry laboratory text have further been modified
• rewritten and edited in English as appeared in this workbook
• Some experiments ar
• Ebook Organic chemistry
• Nucleophilic substitution
• Determining organic structures
• nucleophilic addition
• Organic structures
• Electrophilic aromatic substitution
• Principles of organic chemistry
• Methods of organic chemistry
• The methane series
• The acetylene series
• Polybasic acids
• High school
• University entrance exam
• Teaching organic chemistry
• Organic chemistry exam question
• Interdisciplinary science
• Advanced practical organic chemistry
• Functional groups
• Organic synthesis reagents
• The structure
• Reactions of organic names
• Fundamentals of organic chemistry
• Carbonyl alpha substitution reactions
• Condensation reactions
• Structure determination
• The organic chemistry
• Organic chemistry principles in context
• Starch to the principles
• The structures of organic molecules
• Mass spectrometers
• Infrared spectrometers
• Nuclear magnetic resonance spectrometers
• Modern physical organic chemistry
• Strain and stability
• Covalent binding forces
• Electronic organic materials
• Thermal pericyclic reactions
• The study of organic chemistry
• Stereochemistry and resonance
• Identification of organic compounds
• Elimination reactions
• Electrophilic addition reactions
• Electron delocalization
• Organic compounds
• Cyclic hydrocarbons
• Aromatic alcohols
• Aromatic compounds containing
• Inorganic chemistry
• A guidebook to mechanism in organic chemistry
• Aromatic systems
• Linear free energy relationships
• Symmetry controlled reactions
• Fatty acid catabolism
• The chemistry of the carbonyl group
• The industrial road toward increasing efficiency
• Chemistry of benzene
• Derivatives of benzene
• Summary of Organic Chemistry Dotoral Thesis
• Organic Chemistry Dotoral Thesis
• Natural Products Chemistry
• Biological evaluation
• Chemistry of natural compounds
• Ideas in chemistry
• Molecular sciences
• Synthetic chemistry
• Innovative processes in organic chemistry
• Predictive tools
• Organic chemical reactions
• Electronic Structure
• Electronic configurations of atoms
• Electronic configurations
• Wave properties of electrons
• Wave interactions
• Stereochemistry of alkanes
• Alkane conformations
• Chemical reactions
• Chlorination of Methane
• Chiral carbons
• Nonmobile conformers
• Alkyl Halides