title: Tetra- and hexadentate Schiff base ligands and their Ni(II), Cu(II) and Zn(II) complexes. Synthesis, spectral, magnetic and thermal studies.
abstract: Tetradentate N(2)O(2), N(4) Schiff bases, 1,2-bis(4-oxopent-2-ylideneamino) benzene (BOAB), 1-(4-oxopent-2-ylideneamino-2-[(2-hydroxyphenyl)ethylideneamino] benzene (OAHAB), 7,16-bis(4-chlorobenzylidene)-6,8,15,17-tetra-methyl-7,16-dihydro -5,9,14,18-tetraza-dibenzo[a,h] cyclo tetradecene (BCBDCT), 7,16-bis(2-hydroxy-benzylidene)-6,8,15,17-tetramethyl-7,16-dihydro-5,9,14,18-tetraza-dibenzo [a,h] cyclo tetradecene (BHBDCT) and hexadentate N(4)O(2) Schiff bases, 2,4-bis {2-[1-(2-hydroxyphenyl) ethylideneamino] phenylimino}-3-(2-hydroxybenzylidene) pentane (BHAPHP), 2,4-bis {2-[1-(2-hydroxyphenyl) ethylideneamino] phenylimino}-3-(4-chlorobenzylidene) pentane (BHAPCP) were prepared and characterized by elemental analysis, IR, UV-Vis, (1)H NMR and mass spectra. The solid complexes of the prepared Schiff base ligands with Ni(II), Cu(II) and Zn(II) ions were isolated and characterized by elemental and thermal analyses, IR, electronic and ESR spectra as well as conductance and magnetic susceptibility measurements. The results showed that most complexes have octahedral geometry but few can attain the tetrahedral arrangement. The TG analyses suggest high stability for most complexes followed by thermal decomposition in different steps. The kinetic and thermodynamic parameters for decomposition steps in Cu(II) complexes thermograms have been calculated.
authors: Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt. tarek.ismail70@yahoo.com
authors: Tarek M A
authors: TM
authors: Ismail
authors: Akila A
authors: AA
authors: Saleh
authors: Mosad A
authors: MA
authors: El Ghamry
mesh_terms: D000042:Absorption; D003300:Copper / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D008024:Ligands; D008280:Magnetics; D013058:Mass Spectrometry; D009532:Nickel / Q000737:chemistry*; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry*; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013818:Thermogravimetry; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; D012545:Schiff Bases; D012996:Solutions; D003300:Copper; D009532:Nickel; D015032:Zinc