Coordination geometries of bis(4-amino-3-ethyl-1,2,4-triazole-5-thione) complexes of Mn, Fe, Co, Ni, Cu and Zn: relationship to the 3-methyl analogs

Kajdan, Todd W.; Squattrito, Philip J.; Dubey, Sonal

doi:10.1016/s0020-1693(99)00534-4

Cited by 43 publications

(31 citation statements)

References 16 publications

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“…These observations suggest that the Schiff base exhibited thiol-thione tautomerism, which is well-known within all of the other members of this family of triazoles [35][36][37][38].…”

Section: Syntheses and Characterisation Of Catalystsmentioning

confidence: 86%

“…This information clearly indicates the insertion of metal complexes in the cavities of the zeolite. Figure 3 shows the N 2 adsorption/desorption isotherms of the encapsulated catalysts, which are typical type I according to the IUPAC classification [37], and are characteristics of the microporous nature of the materials. The surface area, pore volume and pore size of the encapsulated metal complex, along with that of the parent Na-Y zeolite, are presented in Table 2.…”

Section: Syntheses and Characterisation Of Catalystsmentioning

confidence: 99%

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Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Abbo

Titinchi

2010

Top Catal

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Chromium(III), zinc(II) and nickel(II) complexes of thio-Schiff base derived from salicylaldehyde and 4-amino-2,4-dihydro-1,2,4-triazole-5-thione have been encapsulated in the nanopores of zeolite-Y by a flexible ligand method. The prepared encapsulated metal complexes have been characterized by surface analysis (XRD and N 2 adsorption/desorption), spectroscopic methods, chemical and thermal analyses. The various techniques of characterization used demonstrated that these complexes were effectively encapsulated in the zeolite supercages without structural modification or loss of crystallinity of the zeolite framework. The encapsulated complexes were screened as heterogeneous catalysts for various oxidation reactions such as phenol, cyclohexene and styrene oxidation, using H 2 O 2 as an oxidant. Under the optimized conditions, these catalysts exhibited high to moderate activity. After a few cycles these catalysts were found to be stable and could be reused after recovering without detectable catalyst leaching or significant loss of activity.

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“…These observations suggest that the Schiff base exhibited thiol-thione tautomerism, which is well-known within all of the other members of this family of triazoles [35][36][37][38].…”

Section: Syntheses and Characterisation Of Catalystsmentioning

confidence: 86%

Section: Syntheses and Characterisation Of Catalystsmentioning

confidence: 99%

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Abbo

Titinchi

2010

Top Catal

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“…These observations suggest that the Schiff base exhibits thiol-thione tautomerism (Scheme 1), which is well-known with all of the other members of this family of triazoles [31][32][33][34].…”

Section: Syntheses and Characterisation Of Catalystsmentioning

confidence: 76%

Synthesis and Catalytic Activity of Cu(II), Fe(III) and Bi(III) Complexes of Thio-Schiff Base Encapsulated in Zeolite-Y for Hydroxylation of Phenol

Abbo

Titinchi

2009

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Coordination of 4-{[(1E)-(2-hydroxyphenyl) methylene]amino}-2,4-dihydro-3H-1,2,4-triazole-3-thione, [sal(thiotriazol)], with M-exchanged zeolite-Y (M = Cu(II), Fe(III) and Bi(III)) leads to the encapsulation of the metal complexes in the supercages of zeolite-Y by flexible ligand method. The prepared encapsulated metal complexes have been characterized by physico-chemical techniques, which indicated that the complexes were effectively encapsulated inside the supercages of Na-Y, without any modification of the morphology and structure of the zeolite. 3D model structure generated for these complexes suggests that zeolite-Y can accommodate these complexes in the FAU supercages without any strain. The catalytic activity of all the catalysts towards the hydroxylation of phenol was evaluated under heterogeneous conditions using hydrogen peroxide as an oxidant. Under the optimized conditions, these catalysts show moderate activity with excellent selectivity ([95%) towards catechol. These catalysts were stable in hydroxylation of phenol and have been reused a further three times after recovering. The results reflect the reusability of the catalysts, as no significant loss in their catalytic activity was noticed.

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“…It is reported that the amine-and thione-substituted triazoles, derived by the condensation of the derivatives of 1,2,4-triazine and the aldehyde or ketone, exhibited a strong affinity to some metal ions, such as Cu(II), Zn(II), Pb(II), Cr(III), Co(II), Ni(II), Mn(II) and Fe(II) [11,15,20]. When the ligands reacted with metal ions in aqueous solutions, its thione functional group rearranged to form thiol, thus allowing the bidentate coordination to metal ions through S and N atom to form a stable five-membered ring while releasing H ions into aqueous solutions [20][21][22][23]. The powerful affinity of S and N atoms to transition metal ions rendered a potential application of these compounds in modulating the surface of sulfide minerals.…”

Section: Introductionmentioning

confidence: 99%

Separation of Molybdenite from Chalcopyrite in the Presence of Novel Depressant 4-Amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one

Yin

Sun

et al. 2017

Minerals

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Abstract:In this paper, 4-amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one (ATDT) was synthesized and introduced as a depressant for selective flotation separation of molybdenite from chalcopyrite. Its flotation performance and adsorption mechanism on minerals were first investigated by flotation, UV spectra, zeta potential, Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray Photoelectron Spectroscopy Measurements (XPS). The bench scale tests indicated that ATDT exhibited stronger depressing power than chalcopyrite, and the selective index of Mo/Cu improved significantly in the presence of ATDT. The results of the UV spectra, zeta potential and FT-IR demonstrated that ATDT chemisorbed on the chalcopyrite surface. The XPS results further confirmed that ATDT might chemisorb onto the chalcopyrite surface through S and N atoms to form five-membered chelate rings and a postulated adsorption mode was presented. For molybdenite, the different measurements agreed well with each other and implied that ATDT might weakly physisorb onto a molybdenite surface.

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Coordination geometries of bis(4-amino-3-ethyl-1,2,4-triazole-5-thione) complexes of Mn, Fe, Co, Ni, Cu and Zn: relationship to the 3-methyl analogs

Cited by 43 publications

References 16 publications

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Synthesis and Catalytic Activity of Cu(II), Fe(III) and Bi(III) Complexes of Thio-Schiff Base Encapsulated in Zeolite-Y for Hydroxylation of Phenol

Separation of Molybdenite from Chalcopyrite in the Presence of Novel Depressant 4-Amino-3-thioxo-3,4-dihydro-1,2,4-triazin-5(2H)-one

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