Structural adjustment of bipyridinium-bearing Cu(II) coordination polymers and the adsorption properties toward methanol, water and ethanol vapors

Abstract Two bipyridinium-bearing Cu(II) coordination polymers, [Cu(BCbpy)(ox)(H 2 O)]·H 2 O ( 1 ) and [Cu 2 (BCbpy) 2 (ox) 2 ]·3H 2 O·DMF ( 2 ), have been synthesized and structurally characterized. Upon solvent modulation, the structure transformation from a closely-packed 1D chain to a 2D laminar network with parallelogram-shaped channels can be achieved. More interestingly, the charge separated skeleton of BCbpy ligand incorporated in compound 2 makes the pore space polarized, endowing it with different adsorption abilities for methanol, water and ethanol vapors.