Synthesis and Characterization of Vanadyl Complex (VO2+) with 4,7 diazadecanediamide ligand
Friska Hasugian (a*), Djulia Onggo (a)
Department of Chemistry, Bandung Institute of Technology
Ganesha Street 10, Bandung 40132, Indonesia friskahasugian100[at]gmail.com
Abstract
4,7 diazadecanediamide ligand is a ligand that has 4 Nitrogen atoms and 2 Oxygen atoms as donor atoms. This ligand has two amide groups which are capable of rearranging from Ni-O to Ni-N when reacting with the central ion Ni (II) so that it can form 2 different complex structures namely [Ni(C8H18N4O2)(H2O)2]2+and [Ni(C8H16N4O2)].3H2O. This ligand also reacts with central ion Cu (II) to form complexes [Cu(C8H18N4O2)(Cl)]+ and [Cu2 (C8H18N4O2)2(C2H8N2)2]Cl4. Then synthesizing the VO (II) complex with 4,7 diazadecanediamide ligand by mixing 0,95 g (4,37 mmol) solid of VOSO4.3H2O in 1 ml of water and 0,9 g (4,45 mmol) ligand in 20 ml hot ethanol. The green complex precipitate formed was filtered, washed and dried in a desiccator containing silica gel and then weighed and obtained a precipitated mass of 1,22 g. The precipitate was analyzed and obtained data on levels of C, H, N and S as follows: C 17,55% (17,02); H 4,80% (3,90); N 10,10% (9,92) and S 9,71% (11,34). Data in parentheses are theoretical calculation data from the complex VO(II). The result of the TGA measurement shows complexes containing two hydrate molecules. The result of FTIR spectrum measurement indicates the presence of new bond formed in the complex, namely the V-N bond observed at wave number 603 cm-1. The vanadyl complex formed has a chemical formula [(VO)2(C8H18N4O2SO4).2H2O], Mr=564 g/mol). The complex is paramagnetic, with a spin only magnetic moment value of 2.02 BM.
Keywords: vanadyl, diazadecanediamide
Topic: Minerals and Complex Materials