Abstract
This chapter discusses spin labeling and membrane structure. The molecular structure of membranes and model membranes is being investigated with a variety of spectroscopic approaches. One of the interesting and potentially important spectroscopic methods is the use of electron spin resonance (ESR) in conjunction with paramagnetic reporter molecules (spin labels). The N—O group contains the unpaired electron that renders the molecule paramagnetic and, hence, suitable for detection by ESR. The alkyl side chains are necessary to stabilize the free radical. The choice of phase and scan direction results in four possible permutations of the same spectrum. Although all four can be found in the spin labeling literature, the presentation most consistent with current trends in spectroscopy involves positive phase and increasing from left to right. The shape of an ESR spectrum is markedly dependent upon the rotational mobility of the nitroxide. Anisotropic motion in the broadest sense refers to any molecular reorientation that does not occur with equal probability in all directions.
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