Superparamagnetic Photonic Crystals

tion. Conversely, a semi-rigid, optimized acentric organization results in coherent second harmonic emission at the supramolecular level, the corresponding intensity from the dendrimer solution being almost proportional to Nmonomerábmonomerñ. The Nmonomer dependence assumes a linear additive model, whereby the individual sub-units follow an interaction-free oriented gas behavior. We have, therefore, clear evidence of quasi-optimized octupolar ordering in a dendrimer made of highly nonlinear ruthenium complexes. This is, to the best of our knowledge, the most efficient type of self-assembled supramolecular octupolar order reported to date. The availability of nonlinear octupolar dendrimers creates attractive possibilities for nanoscale photonic applications with other photonic functionalities, such as pertain to luminescence.