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Trivalent Metal Complexes of 1,3,4-Thiadiazole Derivatives | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 13, Issue 1, 2008, Pages 40-44 | ||
| Author | ||
| Khalil K. Abid | ||
| Abstract | ||
| New derivatives 2,5-bis(2-amino pyrimidyl) -1,3,4-thiadiazole (APMTD), and 2,5-bis( 1- thiacarbazino)-1,3,4- thiadiazole(TCTD), and their complexes with trivalent metal ions; La+3, Y+3 and Ce+3 were prepared and characterized using IR,UV-Visible, Atomic absorption, Molar conductivity and Dissociation constant. These measurements suggest an octahedral geometry with ionic nature for all of the prepared complexes. Introduction: Although 1,3,4-thiadiazole ring is classified as π-excessive1, the presence of two nitrogen atom of pyridine type in the ring leave the carbon atoms with rather low electron density , and consequently no electrophilic substitution in the unsubstituted 1,3,4-thiadiazole ring have been recorded. Three toutomers of the ligand ( I,II and III ) had been reported2,3 . Infra-red spectra showed an absorption band near 2300 cm-1 characteristic for SH group. The 2,5-dithio structure (I) is excluded by ultraviolet spectral evidence , while 2-mercapto-5-thion structure (II) had been established in CHCl3 solution and the dithione form (III) predominate in ethanol solution4 . | ||
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