The single-crystal structure of [Cu{BH(N₂C₃H₃)₃}₂] has been determined by X-ray crystallography. The triclinic unit cell, space group P with a= 10.309(2), b= 13.794(3), c= 11.677(3)Å, α= 127.39(2), β= 88.46(2), and γ= 116.63(2)°, has two independent molecules with the copper(II) atoms at centres of symmetry. The tris-(pyrazolyl)borate ligands are tridentate to yield an elongated rhombic octahedral CuN₆ chromophore involving a marked distortion away from the trigonal symmetry of the free tripod ligands. The two independent CuN₆ chromophores have significantly different Cu–N bond lengths which yield tetragonalities (R_S/R_L) of 0.792 and 0.866, respectively. The polycrystalline electronic properties are shown to be consistent with the restricted tetragonal distortion of the CuN₆ chromophore imposed by the bite of the hydrotris(pyrazolyl)borate ligand. The relative tetragonalities of the two chromophores suggest that while Cu(1)N₆ involves a static stereochemistry, that of Cu(2)N₆ involves some fluxional behaviour as suggested by an analysis of the root-mean-square displacements of the CuN₆ chromophores.