• 제목/요약/키워드: molybdenum (VI)

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몰리브덴(V)의 퀴놀린계 착물합성과 그 성질 (제1보) 치환-8-퀴놀린올의 옥소몰리브덴 (V) 착물 (Synthesis and Characterization of Substituted Quinoline Complexes of Molybdenum(I) Oxo Molybdenum(V) Complexes of Substituted 8-Quinolinols)

  • 이광;오상오
    • 대한화학회지
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    • 제29권4호
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    • pp.372-381
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    • 1985
  • 치환 8-퀴놀린올의 옥소몰리브덴(V)착물을 합성하고 착물의 원소분석, 자외선스펙트럼, 전자스펙트럼 및 전도도를 측정하였고 옥소몰리브덴(VI)착물과 함께 질량분석을 행하여 비교 검토하였다. 옥소몰리브덴(V) 착물은 비전해질이고 몰리브덴-산소의 신축진동은 $940cm^{-1}$ 부근에서 강한 흡수띠가 나타나고 결정장전이와 전하이동 전이가 일어났다. 질량분석 결과로 Mo(V, VI)착물에서 몰리브덴과 리간드의 조성이 1:2임을 확인할 수 있었고 옥소몰리브덴(VI)착물에서는 1:1조성의 착물의 질량수가 나타나지만 옥소몰리브덴(V)에서는 일부만 확인되었다.

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Novel Method for Stripping of Molybdenum(VI) after Its Extraction with Cyanex 301

  • Saberyan, Kamal;Maragheh, Mohammad Ghannadi;Ganjali, Mohammad Reza
    • Bulletin of the Korean Chemical Society
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    • 제25권4호
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    • pp.460-465
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    • 2004
  • Hydrofluoric acid has been used as a novel stripping agent for molybdenum(VI) after its extraction with Cyanex 301. In the extraction step, the effects of parameters such as type and initial concentration of acid, type of diluent, extractant concentration, metal concentration and temperature have been studied. In the stripping step, the effects of various stripping agents on stripping efficiency have been investigated. Hydrofluoric acid has been chosen as an effective stripping agent, and the effects of concentration of hydrofluoric acid, stripping time, volume of hydrofluoric acid and the number of stages of stripping have been studied. Molybdenum(VI) has been effectively separated from a large number of elements in binary mixtures, with a very high tolerance limit. Finally, the optimized method has been extended for the analysis of Mo(VI) in spent molybdenum catalysts.

Ionic Equilibria and Ion Exchange of Molybdenum(VI) from Strong Acid Solution

  • Lee, Man-Seung;Sohn, Seong-Ho;Lee, Myung-Ho
    • Bulletin of the Korean Chemical Society
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    • 제32권10호
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    • pp.3687-3691
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    • 2011
  • Ion exchange experiments of molybdenum(VI) from strong HCl and $H_2SO_4$ solution have been done to investigate the existence of anionic complexes. The concentration of HCl and $H_2SO_4$was changed from 1 to 9 M. From the data on the complex formation of molybdenum in aqueous solution, a new distribution diagram of Mo(VI) was constructed in the pH range from zero to 10. AG 1 X-8, an anion exchange resin, and Diphonix, a cation exchange resin were used in the loading experiments. Ion exchange results indicate that anionic complexes of Mo(VI) begins to form from 3 M HCl and 1 M $H_2SO_4$ solution and the tendency to form anionic complexes is stronger in HCl than in $H_2SO_4$ solution. Our results can be utilized in the analysis of Mo(VI) in strong acid solution and in the design of a process to separate Mo(VI).

몰리브덴의 용액화학 (Aqueous Chemistry of Molybdenum)

  • 이만승;최승훈
    • 자원리싸이클링
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    • 제27권4호
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    • pp.44-49
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    • 2018
  • 몰리브덴은 알칼리용액에서는 $MoO{_4}^{2-}$로 존재한다. 수용액의 pH 2와 6 사이의 범위에서는 $MoO{_4}^{2-}$와 수소이온간의 축중합반응에 의해 다양한 동종다중음이온이 형성된다. 몰리브덴용액의 pH가 2 이하의 범위에서는 동종다중양이온이 형성되나 무기산의 농도가 증가함에 따라 무기산의 음이온과 반응하여 이종다중음이온이 형성된다. pH 6 이하의 용액에서 몰리브덴의 농도분포는 몰리브덴과 무기산의 종류와 농도에 의존한다. 따라서 용매추출과 이온교환자료를 해석하기 위해서는 강산용액에서 몰리브덴 화학종을 규명할 필요가 있다.

Molybdenum(VI), -(V), and -(IV) Oxo Complexes with S-methyl 3-(2-hydroxypheny)methylenedithiocarbazate and Its Derivatives

  • Hee-Jung Kim;Bon-Kweon Koo
    • Bulletin of the Korean Chemical Society
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    • 제15권9호
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    • pp.766-771
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    • 1994
  • A number of molybdenum(VI), -(V), and -(IV) oxo complexes with S-methyl 3-(2-hydroxyphenyl)methylenedithiocarbazate and its derivatives as the ONS-donor metal-binding substrate are synthesized. The Mo(VI)-dioxo complexes are cis-dioxo Mo$O_2$L(D), where D is solvent molecules such as MeOH, DMF, Py(pyridine), DMSO, and ${\gamma}$-Pic(${\gamma}$-picoline). The Mo(V)-oxo complexes are of the type (PyH)[MoO(NCS$)_2$L] with an octahedral geometry. The Mo(IV)-oxo complexes, MoOL are derived from corresponding Mo(VI)-dioxo complexes by oxo abstraction with PP$h_3$. The complexes are characterized by IR, $^1$H-NMR, UV-Vis spectroscopy and cyclic voltammetry. On the basis of ligand displacement reaction, the qualitative order of D binding for Mo$O_2$L(D) complexes is also discussed.

몰리브덴의 시프-염기착물의 합성과 그 성질 (제1보). 다이옥소 몰리브데늄(VI)의 아릴살릴실알디미나토착물 (Synthesis and Characterization of Molybdenum Complexes with Schiff Bases (I). Bis-(N-aryl salicylaldiminato) of dioxomolybdenum (VI) Complexes)

  • 오상오;구본권
    • 대한화학회지
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    • 제29권3호
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    • pp.226-232
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    • 1985
  • 디옥소몰리브데늄(VI) 착물, MoO$_2$(H-Sal-R)$_2$, R ; 아릴아민을 디옥소비스살리실알데히다토 몰리브데늄(Ⅵ)과 여러가지 일차아민으로 부터 합성하여 원소분석, 전기전도도 및 분광학적 연구로 부터 이들 착물에 대한 구조를 조사하였다. 적외선 가시 및 자외선 그리고 핵자기 공명스펙트라로 부터 이들 착물은 여섯배위된 팔면체의 cis-MoO$_2$형을 가지고 있음을 알 수 있었고 질량스펙트라로 부터 MoO$_2$와 배위자간의 결합비가 1:2임을 확인하였다. 또한 이들 착물은 노란색 결정으로 공기중에서 오랫동안 안정하고 알코올 디클로메탄 그리고 디메틸포름아마이드에 약간 녹으며 벤젠, 에테르, 사염화탄소등의 일반 유기용매에는 녹지 않았다.

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Tris(8-hydroxyquinolino) molybdenum (III)의 합성과 열적 성질에 관하여 (Preparative and Thermal Studies of Tris (8-hydroxyquinolino)molybdenum (III))

  • 최규원;오준석;이광우;이원
    • 대한화학회지
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    • 제12권4호
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    • pp.146-149
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    • 1968
  • A new chelate compound, tris(8-bydroxyquinolino)molybdenum(III), [$Mo(C_9H_6ON)_3$], has been prepared by the method of electrolytic reduction of the acidic molybdate solution. Thermal decomposition products of the chelate has been studied by DTA and TGA method. It is concluded that the decomposition product is a yellowish green colored bis(8-hydroxyquinolino)dioxo molybdenum(VI), [$MoO_2(C_9H_6ON)_2$].

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