Mostafa Adel, Bazzi Hassan S
Department of Chemistry, Texas A&M University at Qatar, Doha, Qatar.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Sep 15;74(1):180-7. doi: 10.1016/j.saa.2009.06.004. Epub 2009 Jun 11.
The interactions of the electron donors 2-aminopyridine (2APY) and 3-aminopyridine (3APY) with the pi-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), 2-chloro-1,3,5-trinitrobenzene (picryl chloride, PC), and 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil) were studied spectrophotometrically in chloroform at room temperature. The electronic and infrared spectra of the formed molecular charge transfer (CT) complexes were recorded. Photometric titration showed that the stoichiometries of the reactions were fixed and depended on the nature of both the donor and the acceptor. The molecular structures of the CT-complexes were, however, independent of the position of the amino group on the pyridine ring and were formulated as [(APY)(TCNE)], [(APY)(DDQ)], [(APY)(PC)], and [(APY) (chloranil)]. The formation constants (K(CT)), charge transfer energy (E(CT)) and molar extinction coefficients (epsilon(CT)) of the formed CT-complexes were obtained.
在室温下，于氯仿中采用分光光度法研究了电子给体2-氨基吡啶（2APY）和3-氨基吡啶（3APY）与π-受体四氰基乙烯（TCNE）、2,3-二氯-5,6-二氰基对苯醌（DDQ）、2-氯-1,3,5-三硝基苯（苦基氯，PC）以及2,3,5,6-四氯-1,4-苯醌（四氯苯醌）之间的相互作用。记录了所形成的分子电荷转移（CT）配合物的电子光谱和红外光谱。光度滴定表明，反应的化学计量是固定的，并且取决于给体和受体的性质。然而，CT配合物的分子结构与吡啶环上氨基的位置无关，并被表示为[(APY)(TCNE)]、[(APY)(DDQ)]、[(APY)(PC)]和[(APY)(四氯苯醌)]。获得了所形成的CT配合物的形成常数（K(CT)）、电荷转移能（E(CT)）和摩尔消光系数（ε(CT)）。
