A　novel　cadmium　complexes　of　{[Cd(H2biim)2(SO4)]　·3H2O}n　(1)　(H2biim=2,　2＇-biimidazole)　was　synthesized　by　hydrothermal　reaction　of　3CdSO4·8H2O　and　2,　2＇-biimidazole　ligand.　The　complex　was　built　up　by　[Cd(H2biim)2]2+　units　bridged　sequentially　by　SO42-　anions　to　form　1D　zigzag　chains　parallel　to　the　c-axis.　The　H2biim　ligands　were　attached　to　the　1D　chain　as　branches　of　the　chain　by　coordinating　to　Cd2+　at　two　sides　of　the　chain.　The　chains　were　held　together　by　π-π　interaction　and　O-HO　interactions,　thus　yielding　a　3D　extended　supramolecular　network.　The　responses　of　symmetric　stretching　vibration　of　SO42-,　N-C　single　bond,　NC　double　bond　and　anti-symmetric　stretching　vibration　of　N-C　single　bond　were　detected　in　2D　IR　correlation　spectra　under　thermal　perturbation.　The　complex　exhibited　strong　blue　emission　peak　at　498　nm　(λex=397　nm)　that　can　be　assigned　to　a　ligand-to-metal　charge-transfer　(LMCT)　band.