Simultaneous electron transfer from free and intercalated 4-benzoylpyridinium cations in cucurbit[7]uril.
N-Substituted 4-benzoylpyridinium monocations form stable host-guest complexes with cucurbit[7]uril (CB[7]) in DMSO (K(eq) approximately 0.6-1.9 x 10(3) M(-1)). Observation of simultaneous reversible and quasi-reversible e-transfer processes from the free and intercalated quests, respectively, is attributed to the pre-e-transfer host-guest equilibrium. The standard rate constant for Me-BP@CB[7] (k(s) = 1.0 x 10(-4) cm.s(-1)) reflects e-transfer across 5.7 A, corresponding to the distance of the intercalated guest from the outmost perimeter of CB[7] (5.3 A).
Thangavel
Arumugam
A
Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.
Rawashdeh
Abdel Monem M
AM
Sotiriou-Leventis
Chariklia
C
Leventis
Nicholas
N
D001952:Bridged-Ring Compounds / Q000737:chemistry*; D002412:Cations; D004579:Electron Transport; D007093:Imidazoles / Q000737:chemistry*; D015394:Molecular Structure; D011726:Pyridinium Compounds / Q000737:chemistry*; D013816:Thermodynamics; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils
D001952:Bridged-Ring Compounds; D002412:Cations; D007093:Imidazoles; D011726:Pyridinium Compounds; C456276:cucurbit(7)uril; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils