INTERACTION OF COPPER(II) PERCHLORATE WITH 3,3-DIMETHYL-3,4-DIHYDROISOQUINOLINE DERIVATIVES - STRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF DIPERCHLORATO-TETRAKIS(3,3-DIMETHYL-6,7-DIMETHOXY-3,4-DIHYDROISOQUINOLONE-1)COPPER(II)