Second-sphere coordination complexes via hydrogen bonding: Synthesis, spectroscopic characterization, crystal structures and packing of cis-diazidobis(ethylenediamine)cobalt(III) cations with complex fluoroanions

摘要

Crystals of cis-diazidobis(ethylenediamine)cobalt(III) tetrafluoroborate nitrate [cis-Co(en)(2)(N-3)(2)](2) (BF4) (NO3) I and cis-diazidobis (ethylenediamine)cobalt(III) hexafluorosilicate, [cis-Co(en)(2)(N-3)(2)](2)(SiF6) Il have been obtained by slowly mixing the separately dissolved cis-diazidobis(ethylenediamine)cobalt(III) nitrate with sodium salt of tetrafluoroborate and hexafluorosilicate, in aqueous medium in 1: 1 and 2:1 molar ratio, respectively. Elemental analyses and spectroscopic techniques (IR, UV/visible, H-1 and C-13 NMR) were studied for characterizing the complex salts. Single crystal X-ray structure determinations revealed supramolecular assemblies via hydrogen bonding network between ionic groups and NH2 group of coordinated ethylenediamine molecules, i.e. second-sphere coordination. (c) 2005 Elsevier B.V. All rights reserved.