عنوان المقالة:تحضير التجمعات الذاتية للمعقدات التناسقية سداسية التناسق مع مزيج جسري لمجاميع للكاربوكسيليت والازايد Formation of polymeric assemblies of six-coordinate metal complexes with mixed bridges of dicarboxylato-azido moieties
رياض محمود احمد/ jتقي الدين حمدان/ احمد ثابت نعمان حسن احمد حسن/ محمد جابر الجبوري/ هيرمان بوتجيتر
English Authors
Riyadh M. Ahmed†, Taki A. Hamdan, Ahmed T. Numan, Mohamad J. Al-Jeboori, and Herman Potgieter
Abstract
New biscarboxylato zwitterionic ligands, namely bis(N-carboxylatoethyl)-4,4-dipyridinum) L1 and bis(Ncarboxylatopropyl)-)-
4,4-dipyridinum) L2, were synthesized from the reaction of 4,4-dipyridine with
3-bromopropanoic acid and 4-bromobutanoic acid, respectively. The reaction of these ligands and the
azido coligand with some metal ions resulted in the formation of polymeric complexes of general formulae
[Cr2(Ln)(N3)4]Cl2·H2O and [M2(Ln)(N3)4] xH2O, where (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and
Cd(II); n = 1, 2; x = 1, 1, 1, 1, 0, 1, and 1, respectively.) The oxygens of the carboxylato group are coordinated
to the metal ion in a bidentate fashion. The mode of bonding and overall geometry of the complexes were
determined through IR, UV–VIS, NMR and mass spectral studies, magnetic moment measurements, elemental
analysis, metal content, chloride content and conductance. These studies revealed the formation of polymeric
assemblies of six-coordinate complexes with distorted octahedral geometries about metal centers.
رياض محمود احمد | Riyadh Mahmood Ahmed | 12226