TY - JOUR
T1 - CCIQS-1: A Dynamic Metal-Organic Framework with Selective Guest-Triggered Porosity Switching
AU - Velasquez-Hernandez, Miriam de J.
AU - Lopez-Cervantes, Valeria B.
AU - Martinez-Ahumada, Eva
AU - Tu, Min
AU - Hernandez-Balderas, Uvaldo
AU - Martinez-Otero, Diego
AU - Williams, Daryl R.
AU - Martis, Vladimir
AU - Sanchez-Gonzalez, Eli
AU - Chang, Jong-San
AU - Lee, Ji Sun
AU - Balmaseda, Jorge
AU - Ameloot, Rob
AU - Ibarra, Ilich A.
AU - Jancik, Vojtech
PY - 2022/1/25
Y1 - 2022/1/25
N2 - The synergy between porosity and soft properties in metal-organic frameworks (MOFs) can result in materials with adaptability of the pore size/shape to the adsorbate. Herein, we present a new guest-responsive flexible MOF: CCIQS-1. This material consists of threefold interpenetrated subnetworks comprising [Sc3(μ3-O)(H2O)2(OH)(μ-O2CR)6] nodes interconnected by 4,4′-(9,10-anthracenediyl)dibenzoate ligands. This arrangement gives rise to the formation of hydrophilic and hydrophobic channels. Although the activated material is permanently porous, a crystal-to-crystal phase transition takes place upon solvent removal, leading to the contraction of the hydrophobic pores while 1D hydrophilic channels remain open. As a result, CCIQS-1 exhibits a higher affinity for guests with moderate polarity [tetrahydrofuran (THF), MeOH, and acetone] than for non-polar ones (toluene, cyclohexene, and hexane). X-ray diffraction studies on the contracted-pore phase (cp-CCIQS-1) after exposure to different solvents indicate that only adsorbates with a suitable polarity and molecular size trigger the recovery of the open-pore phase (op-CCIQS-1) via the combination of a breathing effect and subnetwork displacement.
AB - The synergy between porosity and soft properties in metal-organic frameworks (MOFs) can result in materials with adaptability of the pore size/shape to the adsorbate. Herein, we present a new guest-responsive flexible MOF: CCIQS-1. This material consists of threefold interpenetrated subnetworks comprising [Sc3(μ3-O)(H2O)2(OH)(μ-O2CR)6] nodes interconnected by 4,4′-(9,10-anthracenediyl)dibenzoate ligands. This arrangement gives rise to the formation of hydrophilic and hydrophobic channels. Although the activated material is permanently porous, a crystal-to-crystal phase transition takes place upon solvent removal, leading to the contraction of the hydrophobic pores while 1D hydrophilic channels remain open. As a result, CCIQS-1 exhibits a higher affinity for guests with moderate polarity [tetrahydrofuran (THF), MeOH, and acetone] than for non-polar ones (toluene, cyclohexene, and hexane). X-ray diffraction studies on the contracted-pore phase (cp-CCIQS-1) after exposure to different solvents indicate that only adsorbates with a suitable polarity and molecular size trigger the recovery of the open-pore phase (op-CCIQS-1) via the combination of a breathing effect and subnetwork displacement.
UR - http://www.scopus.com/inward/record.url?scp=85122782473&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.1c03388
DO - 10.1021/acs.chemmater.1c03388
M3 - Article
SN - 0897-4756
VL - 34
SP - 669
EP - 677
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 2
ER -