Synthesis and Crystal Structures of Cadmium(II) Cyanide with Branched-Butoxyethanol

Two novel 3D cadmium(II) cyanide coordination polymers with branched-butoxyethanol compounds (iBucel = iso-butoxyethanol, tBucel = tert-butoxyethanol), [{Cd(CN)(2)(iBucel)(2)}{Cd(CN)(2)(H2O)(iBucel)}(2){Cd(CN)(2)}(6) center dot 2(iBucel)](n) I and [{Cd(CN)(2)(H2O)(1.06)(tBucel)(0.94)}{Cd(CN)(2)(tBucel)}(2){Cd(CN)(2)}(2)center dot 1.06(tBucel)](n) II, were synthesized and characterized by structural determination. Complex I contains two distinct Cd(II) coordination geometries: octahedral and tetrahedral. In contrast, complex II contains three distinct Cd(II) coordination geometries: octahedral, square-pyramidal, and tetrahedral. In the two complexes, branched-butoxyethanol molecules behave as both a ligand and a guest in the Cd(CN)(2) cavities. The framework in I contains octahedral and tetrahedral Cd(II) in a 3:6 ratio. In I, the coordination environments of octahedral Cd(II) are cis-O-Cd-O. The framework in II contains octahedral, square-pyramidal, and tetrahedral Cd(II) in a 1:2:2 ratio. In II, the coordination environment of octahedral Cd(II) is disordered trans-O-Cd-O and the axial oxygen ligand is either a water or tBucel molecule. In II, the square-pyramidal Cd(II) geometry is formed by one tBucel ligand and four cyanide ligands. The Cd(CN)(2) frameworks of the two complexes exhibit different structures.