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The hexakis(N,N ‘-dimethylurea)cobalt(II) cation: A flexible building block for the construction of hydrogen bonded networks

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The hexakis(N,N ‘-dimethylurea)cobalt(II) cation: A flexible building block for the construction of hydrogen bonded networks
Papaefstathiou, GS Keuleers, R Milios, CJ Raptopoulou, CP and Terzis, A Desseyn, HO Perlepes, SP
scientific_publication_article
Επιστημονική δημοσίευση - Άρθρο Περιοδικού (EL)
Scientific publication - Journal Article (EN)
2003
The ligand N,N’-dimethylurea (DMU) is used to propagate the octahedral coordination geometry of [Co(DMU)(6)](2+) into 1D and 2D assemblies via a combination of coordinative bonds and interionic hydrogen-bonding. Compounds [Co(DMU)(6)](ClO4)(2) (1), [Co(DMU)(6)](BF4)(2) (2) and [Co(DMU)(6)](NO3)(2) (3) have been prepared from the reactions of DMU and the appropriate hydrated cobalt(II) salts in EtOH, MeCN or Me2CO (only for 1) in the presence of 2,2-dimethoxypropane. Crystal structure determinations demonstrate the existence of [Co(DMU)(6)](2+) cations and ClO4- BF4- or NO3- counterions. The great stability of the [Co(DMU)(6)](2+) cation in the solid state is attributed to a pseudochelate effect which arises from the existence of strong intracationic N-H...O(DMU) hydrogen bonds. The [Co(DMU)(6)](2+) cations and counterions self-assemble to form a hydrogen-bonded 1D architecture in 1, and different 2D hydrogen-bonded networks in 2 and 3. The precise nature of the resulting supramolecular structure is influenced by the nature of the counterion. Two main motifs of intermolecular (interionic) hydrogen bonds have been observed: N-H...O(ClO4-, NO3-) or N-H...F(BF4-) and weak C-H...F(BF4-) or C-H...O(NO3-) hydrogen bonds. The complexes were also characterized by vibrational spectroscopy (IR, far-IR, low-frequency Raman). The spectroscopic data are discussed in terms of the nature of bonding and the known structures. (EN)
Θετικές Επιστήμες
Θετικές Επιστήμες (EL)
Science (EN)
English
Σχολή Θετικών Επιστημών » Τμήμα Χημείας
https://creativecommons.org/licenses/by-nc/4.0/
University of Athens
Pergamos Digital Library
Journal Article



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