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• W2890178360 endingPage "814" @default.
• W2890178360 startingPage "798" @default.
• W2890178360 abstract "Thiophene nucleus has shown various biological activities like antibacterial, analgesic, antitumor, anti-inflammatory and used as building blocks for synthesis of agrochemicals. It has applications as metal chelating agents and in the development of insecticides. Due to excellent chelation, studies on metal chelates with Schiff bases of thiophene nucleus have received good attention. In the present study, the complexes of Co (II), Ni (II), Cu (II) and Zn (II) with Schiff base 3-(2-(thiophen-2-yl methylene) hydrazinyl)-2H-benzo [b] [1,4] oxazin-2-one (TM-HBO) derived from Thiophene-2-carboxaldehyde and 3-Hydrazino-1,4-benzoxazine-2-one (HBO) have been synthesized. The ligand acts as bis-bidentate ONNN/ONNS donor. The characterization of the ligand was done by LC-MS, IR, 1H NMR and electronic spectral studies. Characterization of the complexes was done by elemental analysis, molar conductivity studies, magnetic susceptibility studies, thermal studies, IR, electronic, ESR spectral studies etc. The geometrical structures have been found to be octahedral and square planar/octahedral. Degradation pattern of the compounds is shown by thermal studies. Thermal stabilities of Co (II), Ni (II), Cu (II) and Zn (II) complexes of TM-HBO were calculated by TGA analysis. The Kinetic parameters-energy of activation (Ea), enthalpy (ΔH), entropy (ΔS) and free energy changes (ΔG) have been determined by thermogravimetric data. Coats-Redfern integration method with thirteen kinetic models was used to calculate the kinetic and thermodynamic parameters for the degradation of all the complexes. The stability of the ligand and Cu (II) complex were obtained from their molecular orbital structures from which the quantum chemical parameters were calculated using the HOMO-LUMO energies." @default.
• W2890178360 created "2018-09-27" @default.
• W2890178360 creator A5011638713 @default.
• W2890178360 creator A5043342565 @default.
• W2890178360 date "2019-01-01" @default.
• W2890178360 modified "2023-09-26" @default.
• W2890178360 title "Transition metal complexes supported by ONNN/ONNS bis-bidentate benzoxazine Schiff base: Synthesis, characterization, geometry optimization and non-isothermal kinetic parameters" @default.
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• W2890178360 doi "https://doi.org/10.1016/j.molstruc.2018.09.042" @default.
• W2890178360 hasPublicationYear "2019" @default.
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