Several　novel　acyclic　multi-site　receptors　comprising　of　imidazolium　moieties　were　synthesized　and　structurally　characterized.　All　of　these　compounds　were　characterized　through　H-1　NMR,　C-13　NMR,　MS　and　IR,　elemental　analysis.　The　crystal　structures　of　1,4-bis(1-ferrocenylmethylimidazoliumylethoxy)-benzene　hexafluorophosphate　(1)　and　1,3-bis(1-ferrocenylmethylimidazoliumylethoxy)-benzene　hexafluorophosphate　(2)　were　confirmed　by　X-ray　crystallography,　it　was　clear　that　molecules　were　linked　by　C-H　center　dot　center　dot　center　dot　F　hydrogen　bonds　interactions　between　PF6-　and　cations.　The　anion　binding　studies　were　investigated　by　electrochemistry　and　H-1　NMR　spectroscopy.　Electrochemical　behaviors　indicated　that　all　the　receptors　displayed　unique　electrochemical　sensing　property　for　F-　in　CH3CN.　H-1　NMR　titrations　demonstrated　that　all　the　receptors　have　good　fluoride　binding　ability　in　DMSO-d(6)　through　(C-H)(+)center　dot　center　dot　center　dot　X-　hydrogen　bonds.　The　flexible　receptors　1　and　2　exhibited　higher　affinity　toward　anion　than　the　rigid　receptors　3　and　4.　(C)　2014　Elsevier　B.V.　All　rights　reserved.