Apex-dependent Frank-Kasper phases from simple second-generation dendron assemblies

The pioneering structures from molecular self-assembly demand the non-classical sphere-packing such as Frank-Kasper (FK) phases to explore self-assembly behaviors. To facilitate these phases, the simple second-generation dendrons were used to perform the rich development of FK phases. This optimal structures of dendrons allow the high potential on apex functionalities which attune the core interactions. These sphere-packing phases are measured and tracked by in-situ small-angle X-ray scattering and FT-IR spectroscopy. The electron density maps of sphere-packing phases are reconstructed from X-ray scattering data to analyze the characteristics of each phase. To establish the phase stability regime from the free energy balance of dendron assemblies, we apply enthalpic/entropic effects which accommodate the core interactions of apex functionalities. Our approach to modulating the core interactions in a basic second-generation dendron assembly envisions a feasible strategy and primitive platform for manipulating diverse sphere-packing FK assemblies and quasiperiodic arrays.