A synthetic strategy is described to obtain supramolecular dendritic structures of nanometric dimensions made of metal complex units which absorb light all over the UV and visible spectral region. Specific metal and/or ligands can be placed in designed sites of the supramolecular array by an appropriate choice of the building blocks. A made-to-order control of the patterns of electronic energy transfer can thus be achieved. Supramolecular species containing up to 22 metal atoms have been prepared and their light absorption, luminescence, and energy transfer properties have been investigated.