EFFECTS OF LARGER CHELATE RINGS ON THE GEOMETRY AND PROPERTIES OF COPPER(II) COMPLEXES - CRYSTAL AND MOLECULAR-STRUCTURE AND SPECTRAL PROPERTIES OF AQUO(1,1-DIFLUORO-4,5,12,13-TETRAMETHYL-1-BORA-3,6,11,14-TETRAAZA-2,15-DIOXACYCLO-PENTADECA-3,5,11,13-TETRAENATO)COPPER(II) PERCHLORATE