By R. Kaptein (auth.), L. T. Muus, P. W. Atkins, K. A. McLauchlan, J. B. Pedersen (eds.)

ISBN-10: 9401012652

ISBN-13: 9789401012652

ISBN-10: 9401012679

ISBN-13: 9789401012676

Magnetic resonance has continually been in a position to shock with its skill to show new phenomena. simply whilst apparently to be coming into a quiet heart age it bursts into task with a few new manifestation of its versatility. This occurred many years in the past, whilst observations on anomalous intensities have been checked out extra heavily, and the pursuit of motives and extra facts laid the principles of the themes taken care of during this quantity. In organizing the NATO complex examine Institute we tried to assemble a host, yet on no account all, of these who had contributed considerably to the topic, and to acquire from them a finished and exact exposition of the topic. We have been relatively apprehensive to prevent a suite of lectures that dealt completely with the idea of the topic, simply because a lot of the curiosity in chemically caused magnetic polarization is because of its usefulness in purposes to chemical difficulties: it's a actual chemical tech­ nique, not only an fun diversion for theoreticians. We set approximately organizing the direction with the assumption of constructing it precious to those that desired to use the approach (for, finally, when it comes to nuclear polarization, CIDNP, the approach can be utilized in any laboratory with minor amendment of normal equipment).

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Extra info for Chemically Induced Magnetic Polarization: Proceedings of the NATO Advanced Study Institute held at Sogesta, Urbino, Italy, April 17–30, 1977

Sample text

Secondly, cancellation may occur because the reaction partners may be regenerated via two independent pathways. In-cage electron return will regenerate the reactants and transfer to them a characteristic polarization pattern; degenerate electron exchange between "free" radical ions and their diamagnetic precursors will transfer the opposite polarization to the reactants. In most cases, the in-cage polarization, which is transferred to the reactant-product without loss, will outweigh the escape polarization.

2 1 Pure multiplet effect, H Figure lB shows the spectrum of ethyl iodide obtained as a scavenging product during the decomposition of dipropionyl peroxide in ortho-dichlorobenzene (ODCB) saturated with 12 at 120 0 • (CH 3CH 2C0 2 ) 2 ---'r 2CH 3CH Aoi. = _ A~ = * 12 i ----"'~~ CH -*CH-I €. ~ _ 2 + rme + J = 0-= (AE) ---H+ = AE + The radical coupling product, butane, exhibits a multiplet effect too complicated to fit the simple rules and the disproportionation products ethane and ethylene both have single line nmr spectra which cannot exhibit a multiplet effect.

In this system, the degree of broadening reflects the spin density distribution in the radical ion derived from DET. 35G). 38 Figure 5 shows the temperature dependence and the effect of quencher concentration on the pmr spectrum of the methoxy signal of DMB during the electron transfer quenching of 3DFB*. Clearly, the degree of broadening shows a negative temperature coefficient and increases with decreasing quencher concentration. These results are compatible with rapid electron exchange between DMB and its radical cation.

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Chemically Induced Magnetic Polarization: Proceedings of the NATO Advanced Study Institute held at Sogesta, Urbino, Italy, April 17–30, 1977 by R. Kaptein (auth.), L. T. Muus, P. W. Atkins, K. A. McLauchlan, J. B. Pedersen (eds.)

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