[2]Pseudorotaxane Formation with FRET Based Luminescence Response: Demonstration of Boolean Operations through Self-Sorting on Solid Surface.
Binary pseudorotaxane formation between an aza crown derivative as host (H) and two different imidazolium derivatives as guests (G1and G2) have been studied in detail by NMR (1H NMR, 2D NOESY), optical (steady state electronic and emission spectroscopy), and mass spectroscopy. Binding stoichiometry (1:1), association constant for the respective [2]pseudorotaxane formation (KaH.G1= (2.61 ± 0.015) × 103M-1and KaH.G2= (1.27 ± 0.16) × 103M-1), and associated thermodynamic parameters are also evaluated based on isothermal titration calorimetric (ITC) studies. FRET based luminescence ON responses are observed on formation of the binary pseudorotaxane (H.G1and H.G2) in a nonpolar medium like dichloromethane. The thermodynamic feasibility of such an energy transfer process is also examined. The higher affinity of H and 18-crown-6 toward K+, as compared to those toward G1or G2, and the reversibility in the host-guest binding process are utilized in demonstrating the self-sorting phenomena with associated changes in luminescence responses that could be correlated for Boolean operators like YES, INHIBIT, OR, and AND gates.
Organic Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India.
Monalisa
M
Gangopadhyay
Organic Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India.
Arunava
A
Maity
Organic Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India.
Ananta
A
Dey
Organic Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India.|CSIR-Central Salt & Marine Chemicals Research Institute , Gijubhai Badheka Marg, Bhavnagar,Gujarat 364002, India.
Amitava
A
Das