Energy transfer from the excited triplet (trip-doublet and trip-quartet) state of copper porphyrin to the lowest excited triplet state of its free-base partner was detected by measurements of T-T transient absorption of a -(CH/sub 2/)/sub 3/- covalently linked porphyrin dimer. The excited dimer with free-base in the excited singlet is partly quenched by the copper counterpart. On the other hand, the excited dimer with copper porphyrin in the trip-multiplet state is dissipated not only by the fast electronic relaxation within the copper porphyrin but also by the intramolecular energy transfer to the free-base partner.