Synthesis, characterization, and redox behavior of new selenium coronands and of copper(I) and copper(II) complexes of selenium coronands.

The synthesis and characterization of new selenium coronands and of copper(I) and copper(II) complexes of selenium coronands are reported. Molecular structures in the solid state have been determined by X-ray crystallography. The molecular structures of 6,7,13,14-dibenzo-1,5,8,12-tetraselenacyclotetradecane (dibenzo-14Se4 (1)) and 1,5,9-triselenacyclododecane (12Se3 (2)) adopt conformations which maximize the number of possible gauche C−Se−C−C bond torsion angles. 1:  T = 190 K; orthorhombic, space group Pca21; fw = 552.19; Z = 4; a = 9.645(3) A; b = 12.679(6) A; c = 15.332(4) A; V = 1874.9 A3; RF = 0.027 for 1732 data (Io ≥ 2.5σ(Io)) and 200 variables. 2:  T = 190 K; orthorhombic, space group Pn21a; fw = 363.12; Z = 4; a = 14.943(4) A; b = 5.638(2) A; c = 14.229(3) A; V = 1198.8 A3; RF = 0.026 for 862 data (Io ≥ 2.5σ(Io)) and 111 variables. The molecular structures of 1,5-diselena-9,13-dithiacyclohexadecane (16Se2S2 (3)) and [Cu(16Se2S2)][SO3CF3]2 (4) correspond to those displayed by both of the analogou...