✦ LIBER ✦

Hexaamminecobalt(III) complexes as multiple hydrogen bond donors: Synthesis, characterization and X-ray structural study of mixed anion complexes [Co(NH3)6]Br2(BF4) and [Co(NH3)6]Cl2(HC2O4)·H2O

✍ Scribed by Ritu Bala; Raj Pal Sharma; Upendra Sharma; Andrew D. Burrows; Kevin Cassar

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 607 KB
Volume: 832
Category: Article
ISSN: 0022-2860
DOI: 10.1016/j.molstruc.2006.08.028

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✦ Synopsis

The compounds [Co(NH 3 ) 6 ]Br 2 (BF 4 ) 1 and [Co(NH 3 ) 6 ]Cl 2 (HC 2 O 4 )AEH 2 O 2 have been prepared and structurally characterised. The two crystallographically independent cations in 1 are involved in different hydrogen bonding patterns, with one forming predominantly NAHÁ Á ÁF interactions with the tetrafluoroborates and the other forming NAHÁ Á ÁBr hydrogen bonds. The supramolecular structure of 2 shows unusual hydrogen oxalate-water chains in addition to NAHÁ Á ÁO and NAHÁ Á ÁCl interactions. An analysis of crystal structures containing [Co(NH 3 ) 6 ] 3+ and mixed anions reveals that multiple hydrogen bonds between cations and anions can lead to both faceand edge-capping of the [Co(NH 3 ) 6 ] 3+ octahedron.

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