Pure TTF Chains in π-d Material made of Paramagnetic Transition Metal Complex Containing TTF as Ligand, [CuII(hfac)2(TTF-py)2](BF4)2.2CH2Cl2 (hfac = hexafluoroacetylacetonate and TTF-py = 4-(2-tetrathiafulvalenyl-ethenyl)pyridine)