文档介绍：Chapter 11 Spectroscopy(波谱)
Introduction
(A) The instrumental Methods of
structure determination anic
compounds
(B) Property of ic
radiation
(C) Relationship between the molecular
structure and absorption spectrum
Infrared spectroscopy
(A) Infrared Spectroscopy (IR)
(B) Modes of molecular vibrations
(C) Factors to affect frequency
of molecular stretching vibration
and its location in an IR spectrum
(D) Treatment of the sample
(E) Interpreting of IR spectra
Nuclear ic Resonance
(NMR) Spectroscopy
Shielding and deshielding of
protons
The chemical shift
The chemical shift
The relation of molecular structure
with 1H chemical shift
Interpretting 1H NMR spectra
Diastereotopic hydrogens
Enantiotopic hydrogens
Signal splitting: spin-spin coupling
Coupling constant nJab
Splitting role –(n + 1)role
Reciprocity of coupling constants
Splitting patterns
13C NMR Spectroscopy
Introduction
The function of 13C NMR
The great advantage of 13C
spectroscopy
Decoupling techniques
13C chemical shifts
The factors that most affect 13C
chemical shifts
(A) The principal instrumental methods of
structure determination pounds
Nuclear ic
Resonance Spectroscopy
核磁共振谱
Infrared Spetroscopy
红外光谱
IR
Key functional groups
Ultraviolet-Visible
Spectroscopy
紫外可见光谱
UV-VIS
Electron distribution
in the Mole. With
Conjugated π systems
Mass Spectrometry
质谱
MS
Molecular weight and
Formula of the mole. and
the structure units in it.
Absorption
spectrum
1. Carbon skeleton
2. The Environments of
the hydrogens atta-
ched to carbon or
other atoms
Methods
Abbrevia-
tion
Information
NMR
(B) Property of ic radiation:
E= h υ= hc/ λ
h- Planck' s constant: × 10-34 J. s
υ- Frequency( Hz), υ= c ·σ
λ- Wavelength (nm)
c – The speed of light: 3 × 10 8 m. s-1
σ-The wave counts /cm
The properties of both particles and waves
The greater the frequency, the shorter the
wavelengt