CEJC 2(4) 2004 553–562 Synthesis and un-isotherm kinetic study of some ferrocene acids Daniela Apreutesei 1∗ , Gabriela Lisa 1 , Natalia Hurduc 2 , Dan Scutaru 1 1 Faculty of Industrial Chemistry, ” Gh. Asachi” Technical University IASI, B-dul D. Mangeron, No. 71, 700050–IASI, Romania 2 Faculty of Chemistry, ”Al. I. Cuza” University IASI, B-dul Carol I, No. 11, 700506–IASI, Romania Received 5 April 2004; accepted 18 June 2004 Abstract: The goal of this paper is to study thermal stability of some ferrocenes with acidic functional groups. Some other kinetic characteristics such as critical temperature and the rate constant corresponding to maximal degradation speed have been also evaluated. The type of functional units adjacent to the ferrocenyl unit determines thermal stability of ferrocene compounds. Groups with a powerful withdrawing effect determine a decreasing of the temperatures at which the material starts to lose weight. If a very long alkyl chain is connected to the ferrocene unit, a shielding effect in respect to the other carboxylic group was observed, with an increase of the thermal stability. c  Central European Science Journals. All rights reserved. Keywords: Ferrocene acid, Thermogravimetry, kinetic parameters 1 Introduction Both chemical and physical properties of materials are determined, in a great extent, by the combination of structural units in its molecules. In the case of organometallic molecules, the most important factor in inducing special properties is the presence of a metal, which could bring all the different metal properties and also new shapes that cannot be found in other organic compounds. Within a few years of its discovery, a number of functionalized ferrocene molecules had been prepared, with a great applicability in the homogeneous catalysis, enantioselective synthesis, as redox active materials, radiation * E-mail: gapreot@ch.tuiasi.ro Unauthenticated Download Date | 7/26/18 2:12 PM