1,2,3,4-TETRAHYDRO-1,4-METHANONAPHTHALENES AS MODEL COMPOUNDS TO STUDY THE INFLUENCE OF MOLECULAR-STRUCTURE ON MOLECULAR-DYNAMICS BY C-13 NMR RELAXATION DATA

The alkyl 1,2,3,4-tetrahydro-1,4-methanonaphthalenes (THMNs) are propo sed as model compounds for studying the influence of molecular shape o n reorientational dynamics in liquids. They possess a rigid molecular frame to which different alkyl chains are attached, The synthesis of s everal alkyl THMNs is described, and the rotational motions of specifi c C-13-H-1 vectors have been evaluated by the measurement of C-13 rela xation data. The results for the differently-substituted THMNs were co mpared to each other, The velocity of the reorientational motions coul d be related to the molecular shape.