Femtosecond to nanosecond dynamics of 2,2′-bipyridine-3,3′-diol inside the nano-cavities of molecular containers

• DOI: 10.1039/c3cp54038c
• Publication Date: 2013-10-26T08:34:35Z
• Authors: Krishna Gavvala; Abhigyan Sengupta; Raj Kumar Koninti; Partha Hazra
• Keywords: Nanosecond; Bipyridine; Dynamics

Femtosecond fluorescence upconversion measurements are employed to elucidate the mechanism of ultrafast double proton transfer dynamics BP(OH)2 inside molecular containers (cucurbit[7]uril (CB7) and β-cyclodextrin (β-CD)). up-converted signals in water consist growth followed by a long decay component (~650 ps). The appearance (~35 ps) signal indicates presence two-step sequential process water. Surprisingly, CB7 nano-cavity does not exhibit any characteristic process. Interestingly, exists β-CD (having similar cavity size as that CB7), inferring PT nano-cavity. different features above mentioned two macrocyclic hosts may be attributed absence solvation network surrounding nano-cavities CB7, respectively. Finally, docking DFT calculations have been deciphering pictures interactions between host.