Self-assembly of halogenated cobaltacarborane compounds: boron-assisted C--H...X--B hydrogen bonds?
Full structural characterisation and complete synthetic procedures for three monohalogenated cobaltacarborane compounds closo-[3-Co(eta5-C5H5)-8-X-1,2-C2B9H10] (X=Cl (1), Br (2), I (3)) and the dibromo derivative closo-[3-Co(eta5-C5H5)-8,9-Br2-1,2-C2B9H9] (4) are reported. The supramolecular structures of 1, 3, and 4 reveal the existence of intermolecular C--HX--B interactions. The role of these interactions has been investigated through a CSD search and subsequent analysis of the reported crystalline compounds. The results show that halogens become reasonably good hydrogen-bond acceptors when bonded to boron and, in this respect, are comparable in strength to metal-bound halogens.
Giner Planas
José
J
Institut de Ciència de Materials de Barcelona (CSIC), Campus U.A.B., 08193 Bellaterra, Spain.
Teixidor
Francesc
F
Viñas
Clara
C
Light
Mark E
ME
Hursthouse
Michael B
MB
D001895:Boron / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011166:Porphyrins / Q000737:chemistry*; D000098851:Carboranes
D001895:Boron; D011166:Porphyrins; C515487:cobaltacarborane; D000098851:Carboranes