TY - JOUR
T1 - Redox-Responsive Covalent Organic Nanosheets from Viologens and Calix[4]arene for Iodine and Toxic Dye Capture (vol 24, pg 8648, 2018)
T2 - Redox-Responsive Covalent Organic Nanosheets from Viologens and Calix[4]arene for Iodine and Toxic Dye Capture
AU - Skorjanc, Tina
AU - Shetty, Dinesh
AU - Sharma, Sudhir Kumar
AU - Raya, Jesus
AU - Traboulsi, Hassan
AU - Han, Dong Suk
AU - Lalla, Jayesh
AU - Newlon, Ryan
AU - Jagannathan, Ramesh
AU - Kirmizialtin, Serdal
AU - Olsen, John Carl
AU - Trabolsi, Ali
N1 - Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/10/12
Y1 - 2018/10/12
N2 - Owing to their chemical and thermal stabilities, high uptake capacities, and easy recyclability, covalent organic polymers (COPs) have shown promise as pollutant sponges. Herein, we describe the use of diazo coupling to synthesize two cationic COPs, COP1++ and COP2++, that incorporate a viologen‐based molecular switch and an organic macrocycle, calix[4]arene. The COPs form nanosheets that have height profiles of 6.00 nm and 8.00 nm, respectively, based on AFM measurements. The sheets remain morphologically intact upon one‐ or two‐electron reductions of their viologen subunits. MD simulations of the COPs containing dicationic viologens indicate that the calix[4]arenes adopt a partial cone conformation and that, in height, the individual 2D polymer layers are 5.48 Å in COP1++ and 5.65 Å in COP2++, which, together with the AFM measurements, suggests that the nanosheets are composed of 11 and 14 layers, respectively. Whether their viologens are in dicationic, radical cationic, or neutral form, the COPs exhibit high affinity for iodine, reaching up to 200 % mass increase when exposed to iodine vapor at 70 °C, which makes the materials among the best‐performing nanosheets for iodine capture reported in the literature. In addition, the COPs effectively remove Congo red from solution in the pH range of 2–10, reaching nearly 100 % removal within 15 minutes at acidic pH.
AB - Owing to their chemical and thermal stabilities, high uptake capacities, and easy recyclability, covalent organic polymers (COPs) have shown promise as pollutant sponges. Herein, we describe the use of diazo coupling to synthesize two cationic COPs, COP1++ and COP2++, that incorporate a viologen‐based molecular switch and an organic macrocycle, calix[4]arene. The COPs form nanosheets that have height profiles of 6.00 nm and 8.00 nm, respectively, based on AFM measurements. The sheets remain morphologically intact upon one‐ or two‐electron reductions of their viologen subunits. MD simulations of the COPs containing dicationic viologens indicate that the calix[4]arenes adopt a partial cone conformation and that, in height, the individual 2D polymer layers are 5.48 Å in COP1++ and 5.65 Å in COP2++, which, together with the AFM measurements, suggests that the nanosheets are composed of 11 and 14 layers, respectively. Whether their viologens are in dicationic, radical cationic, or neutral form, the COPs exhibit high affinity for iodine, reaching up to 200 % mass increase when exposed to iodine vapor at 70 °C, which makes the materials among the best‐performing nanosheets for iodine capture reported in the literature. In addition, the COPs effectively remove Congo red from solution in the pH range of 2–10, reaching nearly 100 % removal within 15 minutes at acidic pH.
UR - http://www.scopus.com/inward/record.url?scp=85053428016&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053428016&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/corrigendum-redoxresponsive-covalent-organic-nanosheets-viologens-calix4arene-iodine-toxic-dye-captu
U2 - 10.1002/chem.201804498
DO - 10.1002/chem.201804498
M3 - Comment/debate
C2 - 30311997
AN - SCOPUS:85053428016
SN - 0947-6539
VL - 24
SP - 15392
EP - 15392
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 57
ER -