TRANSITION METAL COMPLEXES WITH THE BIDENTATE LIGAND 2,11‐BIS(DIPHENYLPHOSPHINOMETHYL)BENZO(C)PHENANTHRENE (L). X. PREPARATION AND D SPECTROSCOPIC PROPERTIES OF CIS‐(PTCL2(L)) TRANS‐ AND CIS‐(PTH(PPH3)(L))(BF4) AND CRYSTAL AND MOLECULAR STRUCTURE OF CIS‐(PTCL2(L)).CHCL3