Highly selective carbon dioxide uptake by [Cu(bpy-n)2(SiF6)] (bpy-1 = 4,4'-bipyridine; bpy-2 = 1,2-bis(4-pyridyl)ethene).
A previously known class of porous coordination polymer (PCP) of formula [Cu(bpy-n)(2)(SiF(6))] (bpy-1 = 4,4'-bipyridine; bpy-2 = 1,2-bis(4-pyridyl)ethene) has been studied to assess its selectivity toward CO(2), CH(4), N(2), and H(2)O. Gas sorption measurements reveal that [Cu(bpy-1)(2)(SiF(6))] exhibits the highest uptake for CO(2) yet seen at 298 K and 1 atm by a PCP that does not contain open metal sites. Significantly, [Cu(bpy-1)(2)(SiF(6))] does not exhibit particularly high uptake under the same conditions for CH(4), N(2), and, H(2)O, presumably because of its lack of open metal sites. Consequently, at 298 K and 1 atm [Cu(bpy-1)(2)(SiF(6))] exhibits a relative uptake of CO(2) over CH(4) of ca. 10.5:1, the highest value experimentally observed in a compound without open metal sites. [Cu(bpy-2)(2)(SiF(6))] exhibits larger pores and surface area than [Cu(bpy-1)(2)(SiF(6))] but retains a high CO(2)/CH(4) relative uptake of ca. 8:1.
Department of Chemistry, CHE205, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA.
Stephen D
SD
Burd
Shengqian
S
Ma
Jason A
JA
Perman
Benjamin J
BJ
Sikora
Randall Q
RQ
Snurr
Praveen K
PK
Thallapally
Jian
J
Tian
Lukasz
L
Wojtas
Michael J
MJ
Zaworotko
D002245:Carbon Dioxide / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004980:Ethane / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
C572924:1,2-bis(4-pyridyl)ethene; D009942:Organometallic Compounds; D011725:Pyridines; D002245:Carbon Dioxide; D003300:Copper; D004980:Ethane; C034306:4,4'-bipyridyl