The coupling constant for ethylene and acetylene molecules have to be calculated. Concept introduction: The single 1 H NMR signal is split into multiple peaks called the multiplicity of the signal. Splitting of signals is done according to the ( N + 1 ) ) rule. N is the number of adjacent nonequivalent protons. According to the ( N + 1 ) rule, for a proton-coupled with N adjacent nonequivalent protons, the signal split into ( N + 1 ) peak. The splitting is mutual. Splitting occurs only due to nonequivalent protons that are the protons present in the different chemical environment. The distance between any two adjacent peaks is called coupling constant in hertz represented as J . The value of coupling constant for two protons coupling with each other is same. Thus the coupling constant gives vital information about the adjacent groups or protons because protons on adjacent carbons have a similar coupling constant.

Question

Predict what you expect to observe in the EPRspectrum of a species in which an unpaired electroninteracts with one 14N nucleus (I = 1) and one 1Hnucleus (I = 1/2) if the hyperfine coupling constantsare (a) A(14N) = A(1H)=30 G; (b) A(14N)= 30 G,A(1H)= 10 G.

Answer 1

Question

Chapter 13, Problem 13.25P

(a)

Interpretation Introduction

Interpretation:

The coupling constant for ethylene and acetylene molecules have to be calculated.

Concept introduction:

The single 1H NMR signal is split into multiple peaks called the multiplicity of the signal. Splitting of signals is done according to the (N+1)) rule. N is the number of adjacent nonequivalent protons. According to the (N+1) rule, for a proton-coupled with N adjacent nonequivalent protons, the signal split into (N+1) peak. The splitting is mutual. Splitting occurs only due to nonequivalent protons that are the protons present in the different chemical environment.

The distance between any two adjacent peaks is called coupling constant in hertz represented as J. The value of coupling constant for two protons coupling with each other is same. Thus the coupling constant gives vital information about the adjacent groups or protons because protons on adjacent carbons have a similar coupling constant.

(b)

Interpretation Introduction

Interpretation:

The hybridization of cyclopropane molecule coupling has to be detremined using the given data of coupling constant.

Concept introduction:

The single 1H NMR signal is split into multiple peaks called the multiplicity of the signal. Splitting of signals is done according to the (N+1)) rule. N is the number of adjacent nonequivalent protons. According to the (N+1) rule, for a proton-coupled with N adjacent nonequivalent protons, the signal split into (N+1) peak. The splitting is mutual. Splitting occurs only due to nonequivalent protons that are the protons present in the different chemical environment.

The distance between any two adjacent peaks is called coupling constant in hertz represented as J. The value of coupling constant for two protons coupling with each other is same. Thus the coupling constant gives vital information about the adjacent groups or protons because protons on adjacent carbons have a similar coupling constant.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

Predict what you expect to observe in the EPRspectrum of a species in which an unpaired electroninteracts with one 14N nucleus (I = 1) and one 1Hnucleus (I = 1/2) if the hyperfine coupling constantsare (a) A(14N) = A(1H)=30 G; (b) A(14N)= 30 G,A(1H)= 10 G.

Consider HCN, which has three features in its IR spectrum: 946, 2380, and -1 3386 cm¹. (a) Sketch the motions of each normal mode and denote any degeneracies. (b) Assign each feature in the IR spectrum to a normal mode of the molecule. (c) Determine the zero-point energy of HCN.

Use a group theoretical argument to decide which of the following transitions are electric-dipole allowed: (a) the π* ← π transition in ethene, (b) the π* ← n transition in a carbonyl group in a C2v environment.