Multidimensional solid state NMR: A unique tool for the characterisation of complex materials

A survey is given on new developments in multidimensional solid state NMR which evolves as an indispensable tool of materials characterisation. After a short introduction NMR is compared with other techniques, in particular X-ray and neutron scattering. The unique information available by solid state NMR is demonstrated by specific examples of structural studies of chain conformation, advanced aspects of chain dynamics, phase separation and interfacial effects as well as non-linear plastic deformation in polymers. Emphasis is placed on the new development of high resolution multiple quantum NMR spectroscopy of abundant nuclei in solids with first experimental examples on the location of hydrogen positions in organic solids, structure of inorganic glasses and chain order in polymer melts and elastomers.