title: Spectroscopic investigation of the charge-transfer interactions between 1,4,7-trimethyl-1,4,7-triazacyclononane and the acceptors iodine, TCNE, TCNQ and chloranil.
abstract: The interaction of the interesting polynitrogen cyclic base 1,4,7-trimethyl-1,4,7-triazacyclononane (TMTACN) with the sigma-acceptor iodine and pi-acceptors tetracyanoethylene (TCNE), 7,7,8,8-tetracyanoquinodimethane (TCNQ) and tetrachloro-p-benzoquinone (chloranil) have been studied spectrophotometrically and cyclic voltametrically in chloroform at 20 degrees C. Based on the obtained data, the formed charge-transfer complexes were formulated as [(TMTACN)I](+).I(3)(-), [(TMTACN)(TCNE)(5)], [(TMTACN)(TCNQ)(3)] and [(TMTACN)(chloranil)(3)] where the stoichiometry of the reactions, donor:acceptor molar ratios, were shown to equal 1:2 for iodine complex, 1:3 for chloranil and TCNQ complexes and 1:5 for TCNE complex.
authors.affiliation: Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar. siham@qu.edu.qa
authors.forename: Siham Y
authors.initials: SY
authors.lastname: AlQaradawi
authors.forename: E M
authors.initials: EM
authors.lastname: Nour
mesh_terms: D001372:Aza Compounds / Q000737:chemistry*; D002703:Chloranil / Q000737:chemistry*; D002725:Chloroform / Q000737:chemistry; D005030:Ethylenes / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010783:Photometry; D013057:Spectrum Analysis; D017186:Titrimetry
chemical_list: C499747:1,4,7-trimethyl-1,4,7-triazacyclononane; D001372:Aza Compounds; D005030:Ethylenes; D009570:Nitriles; D002703:Chloranil; C013703:tetracyanoquinodimethane; D002725:Chloroform; D007455:Iodine; C003393:tetracyanoethylene