Synthesis and electrochemistry of (5Z,5′Z)-2,2′-(alkane-α,ω-diyldisulfanyldiyl)-bis(5-(2-pyridylmethylene)-3,5-dihydro-4H-imidazol-4-one) complexes with cobalt(II) chloride

Abstract

Synthesis and electrochemistry of (5Z,5´Z ) 2,2´ (alkane α α α α α,ω ω ω ω ω diyldisulfanyldiyl) bis(5 (2 pyridylmethylene) 3,5 dihydro 4H imidazol 4 one) complexes with cobalt(II) chloride*A series of S alkylated 2 thiohydantoin derivatives containing two 5 (2 pyridylmethylene) 2 sulfanyl 3,5 dihydro 4Н imidazol 4 one moieties linked through a polymethylene bridge with different numbers of carbon atoms was synthesized for the first time. These compounds were obtained by the alkylation of 3 phenyl 5 (2 pyridylmethylene) 2 thiohydantoin or 3 methyl 5 (2 pyridylmethylene) 2 thiohydantoin with different α,ω dibromoalkanes in ac etone or DMF in the presence of potassium carbonate. Complexes of these compounds (L) with CoCl 2 were synthesized. In all cases, the complexes L(CоCl 2 ) 2 were formed regardless of the ratio of L and inorganic salt introduced into the reaction. According to electronic spectro scopic data, the cobalt atom in the complexes has a tetrahedral coordination environment. The synthesized ligands and complexes were electrochemically studied by cyclic voltammetry.Key words: (5Z,5´Z ) 2,2´ (alkane α,ω diyldisulfanyldiyl)bis(5 (2 pyridylmethylene) 3,5 dihydro 4Н imidazol 4 ones, complexes with cobalt(II) chloride, electronic absorption spec troscopy, cyclic voltammetry. * Dedicated to Academician N. S. Zefirov on the occasion of his 70th birthday. † Deceased.

Studies on DNA binding, electrochemical activation, DNA photocleavage, and biopotency of N and O donor bidentate ligands with Cu(II), Co(II), and Zn(II)

“…4 A 2 (F) and 4 T 1 (F) ! 4 T 1 (P) transitions, in agreement with assignments made earlier for tetrahedral cobalt(II) complexes [20,21]. Together with the magnetic moment, this gives adequate support to a tetrahedral geometry for the cobalt(II) complexes [22].…”