A　series　of　new　heteroleptic　copper(i)　complexes　[Cu(NN)(P＜^＞P)][BF4]　(1-6),　where　N＜^＞N　is　a　pyrazole-substituted　2,2＇-bipyridine　(5-(1H-pyrazol-4-yl)-2,2＇-bipyridine　(5-pzbpy,　L-1),　4,4　&　PRIME;-di(1H-pyrazol-4-yl)-2,2＇-bipyridine　(4,4　&　PRIME;-pz(2)bpy,　L-2),　5,5　&　PRIME;-di(1H-pyrazol-4-yl)-2,2＇-bipyridine　(5,5＇-pz(2)bpy,　L-3),　and　3,8-di(1H-pyrazol-4-yl)-1,10-phenanthroline　(3,8-pz(2)phen,　L-4))　and　PP　is　either　oxybis(2,1-phenylene)bis(diphenylphosphane)　(POP)　or　1,3-bis(diphenylphosphanyl)propane　(dppp),　were　successfully　prepared　and　investigated.　The　crystal　structures　of　1,　2,　3　and　6　were　determined　by　single　X-ray　diffraction.　The　novel　copper(i)　complexes　1,　2　and　3　show　turn-on　emission　sensing　for　halogen　ions.　The　fluorescence　enhancement　of　the　copper(i)　complexes　increases　in　the　order　of　F-　＜　I-　＜　Br-　＜　Cl-,　and　the　differences　in　fluorescence　intensity　could　be　easily　distinguished　with　the　naked　eye　under　UV　light　illumination.　The　H-1　NMR　titration　indicated　that　the　interaction　involves　hydrogen-bond　formation　between　the　halide　(Cl-,　Br-　and　I-)　and　the　acidic　H　of　the　pyrazole　group,　with　N-H　deprotonation　occurring　at　increasing　F-　concentrations.　The　result　was　further　confirmed　by　carrying　out　theoretical　calculations.