Charge transfer complexes of picolines with sigma- and pi-acceptors.
In the present study CT complexes of 2-, 3- and 4-Picolines with (DDQ) 2, 3-dichloro-5, 6-dicyano parabenzoquinone (pi-acceptor) and (I2) Iodine (sigma-acceptor) have been investigated spectrophotometrically in three different solvents (CCl4, CHCl3 and CH2Cl2) at six different temperatures. The formation constants of the CT complexes were determined by the Benesi-Hildebrand equation. The thermodynamic parameters were calculated by Van(')t Hoff equation. The DeltaH degrees , DeltaG degrees and DeltaS degrees values are all negative implying that the formation of studied complexes is exothermic in nature.
Razzaq
Humaira
H
Chemistry Department, Quaid-i-Azam University, 45320 Islamabad, Pakistan. hunza_pk2@yahoo.com
Qureshi
Rumana
R
Janjua
Naveed Kausar
NK
Saira
Farhat
F
Saleemi
Samia
S
D007477:Ions / Q000737:chemistry; D010847:Picolines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry; D013816:Thermodynamics
D007477:Ions; D010847:Picolines; D012997:Solvents