ChemInform Abstract: CRYSTAL AND MOLECULAR STRUCTURES OF BIS(4,4′,6,6′‐TETRAMETHYL‐2,2′‐BIPYRIDYL)COPPER(I) PERCHLORATE, BIS(4,4′,6,6′‐TETRAMETHYL‐2,2′‐BIPYRIDYL)COPPER(II) DIPERCHLORATE, AND BIS(4,4′,6,6′‐TETRAMETHYL‐2,2′‐BIPYRIDYL)COPPER(II) DIPERCHLORATE DIHYDRATE. A SEARCH FOR COPPER(II) AND COPPER(I) COMPLEXES WITH A COMMON LIGAND ENVIRONMENT