Abstract
Incoherent neutron scattering (INS) experiments have been performed on various polycrystalline derivatives of decylammonium manganese tetrachloride. This compound displays a solid state phase transition, often referenced as a ‘chain melting process’, quite similar to that observed in lipid membranes. The quasi-elastic profiles obtained on high and medium resolution spectrometers (1–600 ps time scale) were analysed in the 240–370 K range, in particular at near, below and above the phase transition temperature (308 K). In the high temperature phase, the results clearly indicate that there is a gradient in the dynamical disorder of the -CH2- units in going from the NH3-polar heads anchored to the inorganic matrix to the methyl end groups. Because of the crystalline modifications, the chains can adopt a stabilized ‘kink’ defect (t4gtg′t) located near the methyl end and perform fast motions related to both conformational interconversions and cooperative torsions running along the main molecular axis. We then d...
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