title: Influence of steric factors on exciplex energy and magnetic field effect.
abstract: With the advent of spin chemistry, magnetic field effect (MFE) on exciplex luminescence has emerged as an important domain of research. MFE is a diffusion controlled phenomenon and hence is solvent dielectric (epsilon) dependent. It maximizes at a particular epsilon (epsilon(max)) for a specific exciplex system. Various attempts have been made to explain the variation of this epsilon(max) from one exciplex to another. In our present work we have succeeded for the first time to enmark the energy of exciplex (E(ex)) as the prime factor in determining the epsilon(max). We have indicated a definite inverse correlation (1:1) between epsilon(max) and E(ex). We have also tried to correlate some parameters that are important in exciplex formation, e.g. Charton's steric constant (nu(c)), repulsive energy (R(e)) and E(ex).
authors.affiliation: Serampore College, West Bengal, India.
authors.forename: Suchandra
authors.initials: S
authors.lastname: Chatterjee
authors.forename: Sharmistha Dutta
authors.initials: SD
authors.lastname: Choudhury
authors.forename: Samita
authors.initials: S
authors.lastname: Basu
authors.forename: Nandita
authors.initials: N
authors.lastname: Ghosh
authors.forename: Manas
authors.initials: M
authors.lastname: Chakrabarty
mesh_terms: D002227:Carbazoles / Q000737:chemistry; D003486:Cyanides / Q000737:chemistry; D004574:Electromagnetic Fields; D007700:Kinetics; D008280:Magnetics; D008956:Models, Chemical; D013053:Spectrophotometry / Q000379:methods*; D013696:Temperature; D013816:Thermodynamics
chemical_list: D002227:Carbazoles; D003486:Cyanides; C062319:1,4-dicyanobenzene