Nanoporous Organic Alloys

Abstract

Kristall‐Tuning: Organische Moleküle können bevorzugt mit Molekülen der eigenen Sorte kristallisieren, was eine Feinabstimmung der Kristalleigenschaften durch Dotierung oder Vermischung verhindert. Nanoporöse Steroide (siehe Bild) bilden eine Ausnahme, weil sie in ihren Kanälen verschiedene Endgruppen (angedeutet durch Sechsecke und Kugeln) beherbergen können. Sie können in beliebigem Verhältnis cokristallisiert werden und liefern eine breite Spanne von chiralen, potenziell porösen kristallinen Materialien.

Porous Organic Alloys

“…These data show that CC1 , CC3 ‐ R , and CC4 ‐ R combine to form a non‐stoichiometric solid solution, or an “organic alloy”,2f,h where CC3 and CC4 can be interchanged substitutionally into half of the sites of the cubic lattice. It is therefore possible to incorporate any relative ratio of the CC3 ‐ R and CC4 ‐ R modules without affecting the basic packing mode.…”

“…There is a linear relationship between relative module composition and the lattice parameters of the cocrystals, in agreement with Vegard’s law which is more commonly associated with inorganic alloys and salts 8. Unlike other tercrystals,2h the materials are permanently, measurably porous, and the porosity can be tuned systematically by varying the relative proportions of the modules, thus producing the first truly porous “organic alloys”.…”

Rational Design of Multifunctional Nanopores by Mixing Matching Molecules

“…We can optimistically look forward to the next step of development for multifunctional pores in an even more sophisticated fashion on the basis of the contribution of Davis et al [17] …”

“…[17] All mixtures formed needle-like crystals with the same crystallographic space group P6 1 and similar unit cell parameters. In the co-crystals the occupancy of functional groups (present only in one of the precursors) roughly matched the ratio of the precursor molecules, which was further confirmed by 1 H NMR spectroscopy and electrospray mass spectrometry.…”

“…Those facts are the ideal basics for the formation of co-crystalline systems and offered Davis and coworkers the chance to mix the molecules however they liked, to create nanoporous "organic alloys" [16] with adjustable pore functionalities. [17] And indeed, it turned out that these …”