Static and Dynamic Jahn-Teller Distortions in CuN6 Complexes. Crystal Structures and EPR Spectra of Complexes Between Copper(II) and Rigid, Tridentate cis,cis-l,3,5-Triaminocyclohexane (tach): Cu(tach)2(ClO4)2 , Cu(tach)2(NO3)2. Cryst