Material and method for performing a separation based on halogen bonding

A stationary phase comprising a base material and at least one type of functional group, the functional group is covalently bonded to the base material, wherein the functional group is a positively charged heterocyclic aromatic group carrying at least one Cl, Br, or I residue according to (a) Formula III

• with X being independently of each other H, I, Br or Cl, and
• X′ being independently of each other H, an electron withdrawing group, or an electron donating group, whereby at least one X or X′ is Cl, Br or I;
• (b) Formula IV
• with R being H, an electron withdrawing group, or an electron donating group,
• Y being independently of each other N or P,
• X being independently of each other H, I, Br or Cl, and X′ being independently of each other H, an electron withdrawing group, or or an electron donating group, whereby at least one X or X′ is Cl, Br or I;
• (c) one of the following structures, with X being independently of each other H, a C1-C6 alkyl group, I, Br or Cl,
• and X′ and X″ being independently of each other H, an electron withdrawing group, or an electron donating group, and R being H, an electron withdrawing group, or an electron donating group, and whereby at least one X or X′ is Cl, Br or I;
• or
• (d) Formula VII
• with EW being independently of each other H, an electron withdrawing group, or an electron donating group;
• and Hal being independent of each other H, CH3, Cl, Br or I, whereby at least one Hal is Cl, Br or I.