Nanocomposites showing superparamagnetic properties have been synthesized from imine polymers. The method for the production of the nanocomposites is very simple. The imine polymer reacts with a metal salt and the product is dried. Apparently, the reaction of polymer grains with a metal solution takes place by a surface reaction mechanism. Metal hydroxides precipitate within the polymer matrix without addition of a base or of an oxidizer since the polymer imine groups provide a basic medium. The metal oxides are formed through hydrolysis of the metal hydroxides when drying. The method works the best for imine polymers with a flexible chain and no hydrophobic branches. Several iron and cobalt salts, as well as a manganese salt, have been used in the procedure. The effect of the solvent and of the metal salt counterion on the procedure has been studied.
The preparation of tungsten iodides in large quantities is a challenge because these compounds are not accessible using an easy synthesis method. A new, remarkably efficient route is based on a halide exchange reaction between WCl6 and SiI4. The reaction proceeds at moderate temperatures in a closed glass vessel. The new compounds W3I12 (W3I8 ⋅2 I2) and W3I9 (W3I8 ⋅½I2) containing the novel [W3I8] cluster are formed at 120 and 150 °C, and remain stable in air. W3I12 is an excellent starting material for the synthesis of other metal-rich tungsten iodides. At increasing temperature these trinuclear clusters undergo self-reduction until an octahedral tungsten cluster is formed in W6I12 . The synthesis, structure, and an analysis of the bonding of compounds containing this new trinuclear tungsten cluster are presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.