Tetrathiafulvaleno-Annelated Porphyrins We gratefully acknowledge financial support from Carlsbergfondet and Bengt Lundquists Minnesfond for a post-doctoral position to T. B., the University of Odense for a Ph.D. scholarship to J. O. J. and the French Embassy Copenhagen for a travel grant to J. B. We thank HASYLAB at DESY, Hamburg for beam time at beam line BW1 and DANSYNC for financial support. The gift of Jan Skov Peterson's FORTRAN program LSQREFL is gratefully acknowledged. Finally, we thank Prof. K. S. Murray, University of Monash, Australia for helpful discussions.