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

Abstract

Abstract: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 (H 2 O)(iBucel)} 2 {Cd(CN) 2 } 6 ·2(iBucel)] n I and [{Cd(CN) 2 (H 2 O) 1.06 (tBucel) 0.94 } {Cd(CN) 2 (tBucel)} 2 {Cd(CN) 2 } 2 ·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.