TY - JOUR
T1 - Supramolecular Cages Based on a Silver Complex as Adaptable Hosts for Poly-Aromatic Hydrocarbons
AU - Sun, Na
AU - Wang, Shi Qiang
AU - Andaloussi, Yassin H.
AU - Liu, Guorui
AU - Fu, Tonghuan
AU - Xu, Jialiang
AU - Zaworotko, Michael J.
AU - Bu, Xian He
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/11/26
Y1 - 2020/11/26
N2 - In this work, an L-shaped silver complex, AgLClO4 (L = 2,3-bis[3-(pyridin-2-yl)-1H-pyrazol-1-yl·methyl]quinoxaline), M, is found to be adaptable enough to host a range of medium and large aromatic hydrocarbons including several polycyclic aromatic hydrocarbons (PAHs). The transformation of M from as-synthesized closed (nonporous) crystalline to at least three types of open phase structures in the presence of different aromatic hydrocarbons enables the adaptable binding of M to these aromatics. In essence, M can rearrange its cavities to fit the different sizes and shapes of the guest molecules in the manner that is infeasible with cage compounds or coordination networks. Single-crystal and powder X-ray diffraction confirm the adaptable structures of the resulting host–guest complexes, M·nG (G = guest, n = 0.5 or 0.75). Detailed 1D and 2D nuclear magnetic resonance spectra, along with the fluorescence spectroscopy, reveal that the host–guest complexes feature similar chemical compositions in the solution, but are in the states of rapid exchange in and outside the cages. Such an adaptability of M provides insights into the strength of host–guest interactions and enables a new class of adsorptive molecular materials that can bind a large number of aromatics, specifically PAHs.
AB - In this work, an L-shaped silver complex, AgLClO4 (L = 2,3-bis[3-(pyridin-2-yl)-1H-pyrazol-1-yl·methyl]quinoxaline), M, is found to be adaptable enough to host a range of medium and large aromatic hydrocarbons including several polycyclic aromatic hydrocarbons (PAHs). The transformation of M from as-synthesized closed (nonporous) crystalline to at least three types of open phase structures in the presence of different aromatic hydrocarbons enables the adaptable binding of M to these aromatics. In essence, M can rearrange its cavities to fit the different sizes and shapes of the guest molecules in the manner that is infeasible with cage compounds or coordination networks. Single-crystal and powder X-ray diffraction confirm the adaptable structures of the resulting host–guest complexes, M·nG (G = guest, n = 0.5 or 0.75). Detailed 1D and 2D nuclear magnetic resonance spectra, along with the fluorescence spectroscopy, reveal that the host–guest complexes feature similar chemical compositions in the solution, but are in the states of rapid exchange in and outside the cages. Such an adaptability of M provides insights into the strength of host–guest interactions and enables a new class of adsorptive molecular materials that can bind a large number of aromatics, specifically PAHs.
KW - crystal rearrangement
KW - host–guest interaction
KW - molecular recognition
KW - polycyclic aromatic hydrocarbon capture
UR - http://www.scopus.com/inward/record.url?scp=85096543115&partnerID=8YFLogxK
U2 - 10.1002/smll.202001377
DO - 10.1002/smll.202001377
M3 - Article
C2 - 33140550
AN - SCOPUS:85096543115
SN - 1613-6810
VL - 16
SP - e2001377
JO - Small
JF - Small
IS - 47
M1 - 2001377
ER -