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

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• 作者：Raj Pal Sharma ; Rajni Sharma ; Ritu Bala ; Urszula Rychlewska ; Beata Warzajtis and Valeria Ferretti
• 关键词：Cobalt (III) ; Second-sphere coordination ; Supramolecular motifs ; Hydrogen bonding ; Crystal structure ; Fluoroanions
• 刊名：Journal of Molecular Structure
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：753
• 期：1-3
• 页码：182-189
• 全文大小：313 K

文摘

Crystals of cis-diazidobis(ethylenediamine)cobalt(III) tetrafluoroborate nitrate [cis-Co(en)₂(N₃)₂]₂ (BF₄) (NO₃) I and cis-diazidobis(ethylenediamine)cobalt(III) hexafluorosilicate, [cis-Co(en)₂(N₃)₂]₂(SiF₆) II 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, ¹H and ¹³C 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.