ISOTROPIC AND ANISOTROPIC MAGNETIC EXCHANGE INTERACTIONS THROUGH MU-N-1,N-2 1,2,4-TRIAZOLE AND MU-SULFATO BRIDGES - X-RAY CRYSTAL-STRUCTURE, MAGNETIC-PROPERTIES, AND SINGLE-CRYSTAL EPR STUDY OF (MU-4-AMINO-3,5-BIS(PYRIDIN-2-YL)-1,2,4-TRIAZOLE-N',N-1,N-2,N '')(MU-SULFATO-O,O')[(SULFATO-O)AQUACOPPER(II)]TRIAQUACOPPER(II) HYDRATE