Charge transfer complexation between Rabeprazole and 2,3-dichloro-5,6-dicyano -1,4-benzoquinone (DDQ) as an acceptor has been investigated spectrophotometrically. Based on Job's method of continuous variation plots, the obtained results indicate the formation of 1:1 Charge transfer complex with general formula [(RA) (DDQ)] and Analyses carried out using literature data for backbone 15N NMR relaxation of 20 proteins that differ widely in their sequence, structure, and function show that the segments with defined secondary structural elements are generally stiff relative to less structured or unstructured regions.