SYNTHESIS, STRUCTURE, AND MAGNETIC PROPERTIES OF FLUORIDE-BRIDGED COPPER(II) DIMERS. CRYSTAL AND MOLECULAR STRUCTURES OF BIS(μ-FLUORO)BIS(TRIS(3,4,5-TRIMETHYLPYRAZOLE-N2)COPPER(II)) BIS(TETRAFLUOROBORATE) AND BIS(μ-FLUORO)BIS((5-METHY