Charge-transfer character of halogen bonding: Molecular structures and electronic spectroscopy of carbon tetrabromide and bromoform complexes with organic σ- and π-donors

✍ Scribed by S. V. Rosokha; I. S. Neretin; T. Y. Rosokha; J. Hecht; J. K. Kochi

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 262 KB
• Volume: 17
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.20264

✦ Synopsis

Carbon tetrabromide and bromoform are employed as prototypical electron acceptors to demonstrate the charge-transfer nature of various intermolecular complexes with three different structural types of electron donors represented by (1) halide and pseudohalide anions, (2) aromatic (πbonding) hydrocarbons, and (3) aromatics with (nbonding) oxygen or nitrogen centers. UV-Vis spectroscopy identifies the electronic transition inherent

to such [1:1] complexes; and their Mulliken correlation with the donor/acceptor strength verifies the relevant charge-transfer character. X-ray crystallography of CBr 4 /HCBr 3 complexes with different types of donors establishes the principal structural features of halogen bonding.