A mechanistic and non-mechanistic approach on the solid state thermal decomposition of transition metal complexes of 3-(3-furan-2-yl-acryloyl)- 4-hydroxy-6-methyl-pyran-2-one

Department of Chemistry, Post Graduate and ~esearch Centre, Shri Chhatrapati Shivaji College, Omerga, Dist. Osmanabad-413 606, Maharashtra, India Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad-431 004, Maharashtra, India E-mail : abr_chem@yahoo.co.in Manuscript received 1 November 2007. revised 14 May 2008, accepted 16 May 2008 The thermal decomposition of MnII , FeIII, CuII , NiII and CuII chelates of 3-(3-furan-2-yl-acryloyl)-4-hydroxy6-methyl-pyran-2-one was studied by TG-DTA and X-ray powder diffraction methods. The thermal stability of the complexes was studied using thermogravimetry and the decomposition schemes of the complexes were given. The mechanism of the decomposition has been established from TG data. The kinetic parameters i.e. n (order of reaction), E (energy of activation), Z (pre-exponential factor), ΔS (entropy change) and ΔG (free energy change) were calculated from the TG curve using mechanistic (Sestak-Berggren and Satava) and non-mechanistic (Coats-Redfern, MacCallumTanner and Horowitz-Metzger) intl·gral equations