The Origins of Signal Splitting

B Splitting Tree Diagrams and the Origin of Signal Splitting... 

The origins of signal splitting patterns. Each arrow represents an Hjj nuclear spin orientation. 

A Boussac and AW Rutherford (1992) The origin of the split S3 EPR signal in calcium-depleted photosystem II Biochemistry 34 7441-7445... 

Atisine Conformation or Configuration. An interesting controversy has developed over the origin of an apparently split methyl signal in the n.m.r. spectrum of atisine (50) in aprotic solvents. Pelletier and Oeltman suggested that this corresponds to the two conformations (51) and (52). The coalescence temperature... 

When an electric field is applied to the liquid crystalline solution of polypeptide, the proton signal of a solvent molecule such as methylene bromide or methylene chloride splits into a doublet however, the center signal is still observed in the initial position, even in the steady state (Fig. 7). The origin of the splitting wfll be mentioned in Section V, and let us pay attention only to this center signal here. This signal corresponds to disordered solvent molecules which are free from the action of molecular fields caused by the oriented molecular clusters. These free solvent molecules are more in evidence in the ratio in less concentrated (but fuUy birefringent) liquid crystalline solution. When measured soon after the removd of the external field (the... 

With this introduction to the origin of NMR signals and how spectrometers work, we return to consider further aspects of chemical shift, shielding and deshielding, and signal splitting. 

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