This proposal is part of a research programme at Reading which is focused on thermoresponsive supramolecular gels formed from self-assembling metallo organic polymers. These gels are thermally reversible. Interest in these novel materials is centred on the spin-crossover of the 1-d metallo-organic complex with clear technological applications. We centre attention on the gelation properties of a metallo-organic polymer of [Fe(II) (4-octadecyl - 1,2,4 - triazole) 3(ClO4)2]n in three organic solvents: toluene, cis-decalin and trans-decalin. This system exhibits a spin crossover transition at ~50C. These small-angle neutron scattering will provide much needed structural data on the self-assembly, the gelation process and their relationship to the spin crossover transition. The neutron scattering techniques will be supported by x-ray scattering, TEM, DSC and rheology.