| Abstract
| - The formation, morphology, and structure of two-dimensional Langmuir−Blodgett (LB) assemblies of octadecyltriazole (ODT)-based metal-containing oligomers presenting, in the case of iron, the spin-crossover phenomenonis studied with Brewster angle microscopy, IR dichroism, X-ray diffraction, and atomic force microscopy. Twoprocesses occurring at the air−water interface are confirmed to dominate the mechanism of formation of these LBfilms, the instability of the coordination polymers at the air−water interface and recoordination of metal ions in thesubphase at the interface during the LB deposition process. The Langmuir film allowing the LB film formation ismostly made of ODT. The films do present a lamellar structure in which the ODT molecules are tilted and incorporatecoordinated isolated metal ions and oligomers of metal ions. The morphology of the LB films is globally flat but witha rather high roughness resulting from inhomogeneities related to phenomena occurring during the LB film formation.These observations are in agreement with the relative affinity of the metal ions with ODT and the relative stabilityof the coordination polymers at the air−water interface, which have been determined for the group Cu−Fe−Co−Ni.
|
