Synthesis, Transient Absorption, and Transient Resonance Raman Spectroscopy of Novel Electron Donor−Acceptor Complexes: 5,15-Bis[(4‘-nitrophenyl)ethynyl-10,20- diphenylporphinato]copper(II) and 5-[[4‘-(Dimethylamino)phenylethynyl]-15-(4‘‘-nitrophenyl)ethynyl-10,20-diphenylporphinato]copper(II)