title: Synthesis, spectroscopic and thermal studies of transition metal complexes derived from benzil and diethylenetriamine.
abstract: A macrocyclic ligand, bdta (where bdta=3,6,9,12,15,18-hexaaza-1,2,10,11-tetraphenyl-2,9,11,18-tetraenecyclododecane) has been prepared by cyclocondensation of benzil with diethylenetriamine which efficiently encapsulates transition as well as pseudo-transition metal ions leading to the formation of M(bdta)Cl2 type complexes [where M=Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II)]. The analytical, spectroscopic and magnetic moment data suggests an octahedral geometry for all the complexes. EPR spectra of Mn(II) and Cu(II) show considerable exchange interaction in the complex. They are non-conducting in DMSO. The TGA profile of the ligand and its complexes are identical and consists of two discreet stages. The voltammogram of Cu-complex exhibits a quasi-reversible one-electron transfer wave for Cu(II)/Cu(I) couple.
authors: Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
authors: Sadaf
authors: S
authors: Khan
authors: Shahab A A
authors: SA
authors: Nami
authors: K S
authors: KS
authors: Siddiqi
mesh_terms: D004121:Dimethyl Sulfoxide; D004563:Electrochemistry; D004578:Electron Spin Resonance Spectroscopy; D008024:Ligands; D008280:Magnetics; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010658:Phenylglyoxal / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D011073:Polyamines / Q000138:chemical synthesis / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D028561:Transition Elements / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011073:Polyamines; D028561:Transition Elements; C005391:diethylenetriamine; D010658:Phenylglyoxal; C006697:benzil; D004121:Dimethyl Sulfoxide