Halogens and noble gases

Advances in Synthetic Applications of Hypervalent Iodine Compounds

“…Benziodoxoles have found an important synthetic application as reagents for various oxidative functionalizations of organic substrates. The higher thermal stability of five-membered heterocyclic iodine­(III) reagents made possible the preparation of stable benziodoxole derivatives with I–F, − I–Br, , I–OOR, ,− I–N 3 , − I–CN, ,− and I–CF 3 bonds. ,,, These substituted benziodoxoles have found application as the “atom-transfer” reagents for organic synthesis . The chemistry of benziodoxoles has been summarized in several reviews. ,,, …”

The role of charge assisted arylhalogen–halide ion interactions in the structures of the dibromopyridinium halide salts

“…Our interest, as well as others, has focused on the role of charge assisted halogen-halide ion interactions in halopyridinium salts of halometallate ions, as well as their physical nature [17][18][19][20][21][22][23][24][25][26][27]. The charge assisted interaction is defined as the halogen bond between halide anion and halogen atom attached to positively charge species.…”

Effect of intermolecular interactions on the molecular structure; theoretical study and crystal structures of 4-bromopyridinium tetrafluoroborate and diaqua(3-bromopyridine)difluorocopper(ii)

“…crystal engineering, nanotechnology, drug design, chemical separation, stabilizing three dimensional structures of proteins and DNA etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] One important type of these interactions is halogen bonding. A halogen bond is a noncovalent interaction between a covalently bound halogen atom and nucleophiles, D-Y … Nu (D-Y = halogen donor; Nu = nucleophile).…”

“…Halogen bonding has been the subject of many reviews as well as a book. [3][4][5]7,9,17,18 One significant type of halogen bonding is the C-Y … X-A interaction, where C-Y is the halogen donor and X-A is the halogen acceptor. The halogen acceptor can be a wide range of different species.…”

“…These interactions are controlled mainly by electrostatics, even though dispersion and charge transfer cannot be ignored. 5,7,[19][20][21][37][38][39][40] Theoretical calculations have shown that the strength of these interactions span from weak interactions, ca. 1 KJ mol 21 for C-Cl … Cl-C interactions, to very strong interactions of ca.…”