Département de chimie moléculaire

An innovative coordination polymer based on a tritopic ligand having the bis-terpyridine cyclam (CHTT) unit is explored. Homo- or heteronuclear 1-dimensional coordination polymers can be formed with bivalent metal ions such as Co(II) and Ni(II) in solvent DMF. Creep-recovery curves of the (CoII)2CHTT gels formed from 1-dimensional coordination polymers were analyzed with the Burgers model and demonstrated an original self-healing property, unusual in the class of mol. gels. The influence of the metal type was studied through the structural features using small-angle neutron scattering (SANS) expts. In gels, the corresponding network involves genuine fibers (R ≈ 35 {\AA}), bundles of these fibers and also a fraction of finite size aggregates (rods with aspect ratio f ≈ 3-5). The distribution of these latter structural components is sensitive to the metal ions type. Such tritopic 1-dimensional coordination polymers exhibit a range of original structural features and a facile control of the developed structures in solns. and gels by tuning their thermodn. parameters. The versatility assocd. to the intrinsic dynamic ability of the systems should pave the way to original properties for mol. devices. [on SciFinder(R)]