Manganese(II) complexes of 5-(4-pyridyl), 5-phenyl and 5-(4-methoxy-phenyl)-1,3,4-oxadiazole-2-thione containing 2, 2′-bipyridyl/ethylenediamine: synthesis, spectral, and X-ray characterization

Abstract

Three new mixed ligand complexes [Mn(4-pytone) 2 (bipy) 2 ]bipy (1), [Mn(pot) 2 (en) 2 ] (2) and [Mn(4-mot) 2 -(en) 2 ] (3) (4-pytone = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione, pot = 5-phenyl-1,3,4-oxadiazole-2-thione, 4-mot = 5-(4-methoxy-phenyl)-1,3,4-oxadiazole-2-thione) have been prepared containing bipy/en as coligands. The starting material potassium N-(aryl-carbonyl)-hydrazinecarbodithioates (RCO NHNHCSSK) underwent cyclization during complexation in the presence of bipy or en to give the corresponding 5-aryl-1,3,4-oxadiazole-2-thiones. The complexes have been characterized by physicochemical techniques and single crystal X-ray structure determination. In all cases, the manganese has a six coordinate octahedral arrangement coordinated by 4N atoms of two bipy/en and two covalently bonded N atoms of the oxadiazole-2-thione anions.

Syntheses, structural and thermal studies on Zn(II) complexes of 5-aryl-1,3,4-oxadiazole-2-thione and dithiocarbamates: Antibacterial activity and DFT calculations

“…The potassium salts of the N-aroylhydrazine carbodithioates were prepared by the literature method [32].…”

“…The test compounds were dissolved in DMSO to a final concentration of 2 mg/ml. The test compounds were diluted to various concentrations (2,4,8,16,32,64, 100 lg/mL) in a 5 mL culture tube containing 2 mL Mueller-Hinton broth. One drop of an exponentially growing culture of the test bacterium was inoculated in each concentration of the compounds and incubated at 37 ± 2°C for 24 h. A control was prepared using the test bacterium and an equal volume of DMSO (100 lL) in Mueller-Hinton broth without any test compound.…”

Aqueous Medium Synthesis and Characterization of Mixed-Ligand Molecular Complexes of Manganese(III).

“…The IR spectrum of compound 2 shows characteristics absorptions due to coordinated ethylenediamine, coordinated fluoride and coordinated as well as lattice water. The major bands coming from coordinated ethylenediamine are observed at 1592, 1511, 1351 and at 1034 cm -1 assigned to d(NH 2 ), d(CH 2 ) and n(skeletal) modes of vibrations of coordinated ethylene diamine 21,22 . The observed frequencies and pattern originating from ethylenediamine suggest that ethylenediamine ligand occurs as bidentate one in the compound under discussion.…”