title: Time Resolved Spectroscopic Studies on a Novel Synthesized Photo-Switchable Organic Dyad and Its Nanocomposite Form in Order to Develop Light Energy Conversion Devices.
abstract: UV-vis absorption, steady state and time resolved spectroscopic investigations in pico and nanosecond time domain were made in the different environments on a novel synthesized dyad, 3-(2-methoxynaphthalen-1-yl)-1-(4-methoxyphenyl)prop-2-en-1-one (MNTMA) in its pristine form and when combined with gold (Au) nanoparticles i.e., in its nanocomposite structure. Both steady state and time resolved measurements coupled with the DFT calculations performed by using Gaussian 03 suit of software operated in the linux operating system show that though the dyad exhibits mainly the folded conformation in the ground state but on photoexcitation the nanocomposite form of dyad prefers to be in elongated structure in the excited state indicating its photoswitchable nature. Due to the predominancy of elongated isomeric form of the dyad in the excited state in presence of Au Nps, it appears that the dyad MNTMA may behave as a good light energy converter specially in its nanocomposite form. As larger charge separation rate (kcs ~ 4 x 10(8) s-1) is found relative to the rate associated with the energy wasting charge recombination processes (kcR ~ 3 x 10(5) s-1) in the nanocomposite form of the dyad, it demonstrates the suitability of constructing the efficient light energy conversion devices with Au-dyad hybrid nanomaterials.
authors.forename: Gopa
authors.initials: G
authors.lastname: Dutta Pal
authors.forename: Abhijit
authors.initials: A
authors.lastname: Paul
authors.forename: Somnath
authors.initials: S
authors.lastname: Yadav
authors.forename: Munmun
authors.initials: M
authors.lastname: Bardhan
authors.forename: Asish
authors.initials: A
authors.lastname: De
authors.forename: Joydeep
authors.initials: J
authors.lastname: Chowdhury
authors.forename: Aindrila
authors.initials: A
authors.lastname: Jana
authors.forename: Tapan
authors.initials: T
authors.lastname: Ganguly
mesh_terms: D003198:Computer Simulation; D011211:Electric Power Supplies; D004735:Energy Transfer / Q000528:radiation effects; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D008956:Models, Chemical; D053761:Nanocomposites / Q000737:chemistry* / Q000528:radiation effects; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D010316:Particle Size; D011829:Radiation Dosage; D013057:Spectrum Analysis / Q000379:methods; D013499:Surface Properties; D014159:Transducers
chemical_list: D009930:Organic Chemicals; D006046:Gold