posted on 2021-11-24, 19:36authored byBrian
J. Eckstein, Loren C. Brown, Bruce C. Noll, Michael P. Moghadasnia, Gary J. Balaich, C. Michael McGuirk
The manner of bonding between constituent
atoms or molecules invariably
influences the properties of materials. Perhaps no material family
is more emblematic of this than porous frameworks, wherein the namesake
modes of connectivity give rise to discrete subclasses with unique
collections of properties. However, established framework classes
often display offsetting advantages and disadvantages for a given
application. Thus, there exists no universally applicable material,
and the discovery of alternative modes of framework connectivity is
highly desirable. Here we show that chalcogen bonding, a subclass
of σ-hole bonding, is a viable mode of connectivity in low-density
porous frameworks. Crystallization studies with the triptycene tris(1,2,5-selenadiazole)
molecular tecton reveal how chalcogen bonding can template high-energy
lattice structures and how solvent conditions can be rationalized
to obtain molecularly programmed porous chalcogen-bonded organic frameworks
(ChOFs). These results provide the first evidence that σ-hole
bonding can be used to advance the diversity of porous framework materials.