Charge-transfer interaction of bithienyls and some thiophene derivatives with electron acceptors

Abstract

The charge transfer complexes of 2,2′-bithienyl, 5,5′-dimethyl-2,2′-bithienyl, and some thiophene derivatives as donors with tetracyanoethylene as an acceptor have been studied spectrophotometrically. In addition, complexes of the first donor with chloranil and iodine have been studied. The formation constants and extinction coefficients of the molecular complexes formed have been determined by graphical as well as iterative methods. From measurements at different temperatures, the thermodynamic functions of the complex formation have been calculated. The ionization potentials of the donors have been obtained from the energies of the charge transfer transitions.

Charge-Transfer Complexes of Some Metal 2,4-Pentanedionates with Picric Acid as π-Acceptor

“…In these measurements, concentration of [M(acac) n ] was kept fixed, while the concentration of the accep- The 1 : 1 modified Benesi-Hildebrand equation 18 was used in calculating the values of the equilibrium constant K (l mol -1 ) and the extinction coefficient, ε (l mol…”

Spectral, thermal and kinetic studies of charge-transfer complexes formed between the highly effective antibiotic drug metronidazole and two types of acceptors: σ- and π-acceptors

“…1) [21] for the (1:1) CT complexes (with DDQ, CHL and PA acceptors) or the 1:2 modified Benesi-Hildebrand equation (Eq. 2) [22] for the (1:2) CT complexes (with iodine acceptor). C a and C d are the initial concentrations of the acceptor and donor, respectively, and A is the absorbance of the CT band.…”

IR, 1H NMR, mass, XRD and TGA/DTA investigations on the ciprofloxacin/iodine charge-transfer complex

“…The appearance of the two absorption bands around ≈333, 281 and 250 nm is well known to be characteristic for the formation of the tri-iodide ion (I 3 − ) [26][27][28]. Accordingly, the formed CT follows [29].…”