2D flexible metal–organic frameworks with [Cd2(μ2-X)2](X = Cl or Br) units exhibiting selective fluorescence sensing for small molecules

Two isomorphous 2D flexible metal-organic frameworks with [Cd(2)(μ(2)-X)(2)] (X = Cl or Br) units and dynamic 1D channels, which show tunable or switchable fluorescence signals in response to the loss of guest water molecules, have been synthesized and characterized. Especially, the chloride-bridged complex is found to be a selective fluorescence sensor for MeCN.