Synthesis and Characterisation of Co (II), Cu(II) and Fe (III) Macrocyclic Complex of 2, 3, 4 -Pyridine- 1, 3, 5, 8, 11, 14- Hexaazacyclohexadeca-2-ene bonded With Cyano and Thiocyanato LigandsDownload PDF
Macrocylclic complexes axially bonded with cyano and thiocyanato ligands, synthesized and characterized using FR, UV-Visible Spectra. Macrocyclic ligand find their importance uses as model for protein-metal binding sites in biological system and selective metal extrants in hydrometallergy and study host-guest interactions (8). The Macrocyclic molecules are also widely used as catalyst for industrial application (9). Macrocylic complex show greater biocidial effect as they are potentially active against few bacteria and fungi. Recently a large number of macrocylic ligands have been synthesized using Mass spectroscopy (15-20). Curtius (23) demonstrated the case of inter conversion of a series of complex containing different degree of unsaturation. A number of membrane were prepared with ionophore, PVC, anion excluder (STB) and solvent mediators (DBP and DOP) and were equilibrated with various metal ions. The sensor assembly was used as an indicator electrode in the potentionmetric titration of Co(II) with EDTA. The practical utility of the proposed sensor was investigated in partially non-Aquous media 30% water-methanol and water ethanol mixtures. 2,6- dichloropyridine (0.01 mol, 1.42g) was dissolved in minimum amount (20 ml) of methanol and tetraethylenepentaamine (1.26 ml, 0.01 mol) was added to it. To this mixture a methanol solution of metal salt (chloride /nitrate) (0.01 mol) was added with constant stirring and heating. The mixture was refluxed for 8 h and coloured precipitate thus formed, was filtered in sintered crucible, washed with methanol and dried vacuum. The magnetic and electronic spectral values given in Table are entirely consistent with the octahedral geometry for the complexes of these metals. All the complexes are paramagnetic. 1H NMR spectrum of Fe (III) complex shows a multiplet in the region 6.28-7.89 ppm due to pyridine ring protons (3H) multiplet in the region 8.22-8.42 ppm corresponds to secondary amine protons (5H) and a broad multiplet in the region 2.64-4.32 ppm due to methylene protons (16H).
Keywords: Analytical spectra, macrocyclic complex IR, UV-Visible, CHN, Mass spectroscopy, NMR.