TY - JOUR
T1 - Synthesis, characterization, and electrochemical properties of a novel macrocylic ligand and its transition metal complexes
AU - Yilmaz, Ismail
AU - Kandaz, Mehmet
AU - Özkaya, Ali Riza
AU - Koca, Atif
PY - 2002
Y1 - 2002
N2 - 2,3-Dibromo-6,7,13,14,15,16,22,23-octahydro-14,15-bis-(hydroxyimino)-tribenzo [e, k, q] [ 1,4,7,10,13,16]tetraoxadiazacyclohexadecine (LH4) was prepared by condensation of 1,2-bis-(2′-aminophenoxyethoxy)-4,5-dibromobenzene with cyanogen-di-N-oxide. Mono-, di-, and tri-nuclear transition metal complexes of this ligand ((LH3)2Ni, (LH3)2Zn, (LH3)2Co, (LH3)2Cu, (LH3)2Fe, (LH3)2(UO2)2(OH)2, (LH)2Cu3, (LH)2Co3) were synthesized under basic conditions. The electrochemical properties of the mono- and dinuclear complexes were studied by cyclic voltammetry in DMSO solution containing TBAP. The results showed that all redox processes are based on the metal center and the oxime ligands stabilize the Ni(III), Fe(III), Co(III), and Cu(III) species formed during oxidation. The Fe(II) and U(VI)O2 complexes displayed a different behaviour: a reduction peak with the corresponding anodic signal during the reverse scan was observed. The oxime moiety also stabilizes U(V)O2 which forms during the reduction process of the uranyl complex. Cu(II) was adsorbed on the electrode surface upon scanning cathodically.
AB - 2,3-Dibromo-6,7,13,14,15,16,22,23-octahydro-14,15-bis-(hydroxyimino)-tribenzo [e, k, q] [ 1,4,7,10,13,16]tetraoxadiazacyclohexadecine (LH4) was prepared by condensation of 1,2-bis-(2′-aminophenoxyethoxy)-4,5-dibromobenzene with cyanogen-di-N-oxide. Mono-, di-, and tri-nuclear transition metal complexes of this ligand ((LH3)2Ni, (LH3)2Zn, (LH3)2Co, (LH3)2Cu, (LH3)2Fe, (LH3)2(UO2)2(OH)2, (LH)2Cu3, (LH)2Co3) were synthesized under basic conditions. The electrochemical properties of the mono- and dinuclear complexes were studied by cyclic voltammetry in DMSO solution containing TBAP. The results showed that all redox processes are based on the metal center and the oxime ligands stabilize the Ni(III), Fe(III), Co(III), and Cu(III) species formed during oxidation. The Fe(II) and U(VI)O2 complexes displayed a different behaviour: a reduction peak with the corresponding anodic signal during the reverse scan was observed. The oxime moiety also stabilizes U(V)O2 which forms during the reduction process of the uranyl complex. Cu(II) was adsorbed on the electrode surface upon scanning cathodically.
KW - Co(II)
KW - Electrochemistry
KW - Macrocycle
KW - U(IV)
KW - vic-Dioxime
UR - http://www.scopus.com/inward/record.url?scp=67049155538&partnerID=8YFLogxK
U2 - 10.1007/s007060200033
DO - 10.1007/s007060200033
M3 - Article
AN - SCOPUS:67049155538
SN - 0026-9247
VL - 133
SP - 609
EP - 622
JO - Monatshefte fur Chemie
JF - Monatshefte fur Chemie
IS - 5
ER -